Green Infrastructure
Opportunities that
Arise During Municipal
Operations
SEPA
EPA 842-R-15-002
January 2015
United States
Environmental Protection
Agency
Office of Wetlands, Oceans and Watersheds
National Estuary Program
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CONTENTS
Introduction 1
Green Infrastructure Costs and Benefits 2
Steps to implement Green Infrastructure Projects 5
Review Planning Documents and Codes 6
Identify Funding to Install and Maintain Projects 7
Plan for Maintenance 10
Identify High-Visibility Projects Where Possible 12
Opportunities to Integrate Green Infrastructure 13
Resources 14
Fact Sheets 16
FIGURES
Figure 1. Intended audience 1
Figure 2. Benefits of green infrastructure practices 3
Figure 3. Additional green infrastructure benefits 4
Figure 4. Steps to implement green infrastructure 5
Figure 5. Funding sources for green infrastructure 8
Figure 6. Green infrastructure project fact sheets 13
TABLE
Table 1. Advantages and disadvantages for green infrastructure funding
sources.
ACKNOWLEDGMENTS
This report was developed under EPA Contract No. EP-C-11-009, Work
Assignment No. 3-53 managed by Nancy Laurson, EPA Office of Wetlands,
Oceans, and Watersheds.
The report was prepared by Martina Frey, John Kosco, Christy Williams,
and Ann LaDuca, Tetra Tech, Inc.
Photo Credits
Martina Frey, Tetra Tech, Inc., unless otherwise noted
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INTRODUCTION
Green infrastructure uses natural processes to improve water quality and
manage water quantity by restoring the hydrologic function of the urban
landscape, managing stormwater at its source, and reducing the need for
additional gray infrastructure in many instances. These practices are designed
to restore the hydrologic function of the urban landscape, managing
stormwater at its source and reducing or eliminating the need for gray
infrastructure. An important objective of green infrastructure is to reduce
stormwater volume, which improves water quality by reducing pollutant loads,
stream bank erosion, and sedimentation. When green infrastructure is
employed as part of a larger-scale stormwater management system, it reduces
the volume of stormwater that requires conveyance and treatment through
conventional means, such as detention ponds.
Green infrastructure practices can be integrated into existing features of the
built environment, including streets, parking lots, and landscaped areas. Green
infrastructure practices can be a viable option for managing stormwater in
highly urbanized and infill situations where development density is desired and
offsite mitigation is not a preferred alternative.
This document provides approaches local government officials and municipal
program managers (Figure 1) in small to midsize communities can use to
incorporate green infrastructure components into work they are doing in public
spaces. The guide demonstrates ways in which projects can be modified
relatively easily and at a low cost recognizing that municipal resources can be
limited.
Implementing projects in public spaces can showcase the aesthetic appeal of
green infrastructure practices and provide a visual demonstration of how they
can function. This real-life context will also allow residents, businesses, and
local governments to experience additional benefits and values of many green
infrastructure practices—more walkable streets, traffic calming, green public
spaces, shade, and enhanced foot traffic in retail areas. Municipal managers
can then use the experience gained from the design, installation and
maintenance green infrastructure projects to help tailor regulations and
incentive programs and make green infrastructure easier to implement in the
future.
These highlighted examples and case studies show how integrating green
infrastructure methods can enhance retrofits and maintenance projects and
also provide multiple community benefits. Local governments are in a unique
leadership position to further green infrastructure within their communities.
The U.S. Environmental Protection Agency (EPA) hopes that by using this guide
localities can begin to institutionalize the use of green infrastructure in their
municipal operations.
Elected Officials
Local Government
Code Enforcement Transportation Planning
Mayors Fiscal and Budget
Figure 1. Intended audience
Stormwater
Management and
Permitting
Building/
Development
Services
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GREEN INFRASTRUCTURE COSTS AND BENEFITS
Local agencies are often tasked with retrofitting a property or installing or
replacing stormwater and drainage infrastructure. Overall, green infrastructure
has been shown to be more cost-effective when compared with traditional gray
infrastructure approaches, and green infrastructure offers numerous ancillary
benefits (Figure 2). The visible, above-ground and accessible qualities of green
infrastructure, as opposed to gray infrastructure, provide other benefits,
including, improving air and water quality, improving quality of life, and
offering public education opportunities, as described in Figure 3.
Though green infrastructure can potentially have higher installation costs in
redevelopment and retrofit settings, this is not always the case due to the site-
specific opportunities and constraints on many infrastructure projects. Since
gray infrastructure retrofits can also be costly, green infrastructure can be
integrated into already planned infrastructure improvement projects to help
mitigate demolition and disposal costs.
From a life cycle perspective, it is important to compare the long-term
maintenance and replacement costs associated with green and gray
infrastructure. The vegetation characteristic of many green infrastructure
practices becomes enhanced as it grows over time, whereas gray
infrastructure's engineered materials only deteriorate over the long term. The
maintenance required for green infrastructure practices typically does not
require heavy equipment, whereas maintaining gray infrastructure's pipes,
forebays, basins, and embankments can be more costly.
Green infrastructure can be a cost-effective strategy to help local governments
meet regional water quality objectives. Besides green infrastructure's ability to
improve water quality and reduce stormwater pollution, green infrastructure
reduces the cost of total maximum daily load (TMDL) implementation by
reducing pollutant loads associated with stormwater. Green infrastructure can
reduce the cost to implement a stormwater management program because the
amount of stormwater to be conveyed and treated is reduced.
Green Infrastructure Economics
Several recent publications evaluated the economic benefits associated
with green infrastructure:
• Banking on Green: A Look at How Green Infrastructure Can Save
Municipalities Money and Provide Economic Benefits Community-
wide: http://www.americanrivers.org/assets/pdfs/reports-and-
publications/banking-on-green-report.pdf
• Case Studies Analyzing the Economic Benefits of Low Impact
Development and Green Infrastructure Programs:
http://water.epa.gov/polwaste/green/upload/lid-gi-
programs_report_8-6-13_combined.pdf
• Reducing Stormwater Costs through Low Impact Development
(LID) Strategies and Practices:
http://water.epa. gov/polwaste/green/costs07_index.cfm
• The Value of Green Infrastructure: A Guide to Recognizing its
Economic, Environmental, and Social Benefits:
http://www.americanrivers.org/wp-content/uploads/2013/09/
Value-of-Green-lnfra structure. pdf?c8031c.
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Green Roofs
• Have a longer lifespan than traditional roofs
• Reduce energy costs
• Buildings with green roofs can command
rental premiums
• Vegetation provides habitat for wildlife
Bioswalesand Rain Gardens
• Improve property and neighborhood aesthetics
• Reduce localized flooding
• Promote infiltration and groundwater recharge
• Enhance pedestrian safety when used in traffic
calming applications
Trees
Intercept and absorb rainfall
Reduce urban heat island
Improve habitat and aesthetic value
Provide shade in summer and block wind in
winter, reducing heating and cooling costs
Reduce greenhouse gases by absorbing CO2
Capture urban air pollutants (dust, O3, CO)
Permeable Pavements
• Reduce stormwater runoff and standing water
• Promote infiltration and groundwater recharge
• Improve the longevity of infrastructure
• May be easier to maintain than standard
pavement
Rain Barrels and Cisterns
• Reduce water consumption and associated
costs
• Reduce demand for potable water
• Increase available water supply for other
uses
• Can significantly reduce stormwater
discharges from roofs
Green Space
• Increase soil porosity
• Reduces stormwater runoff volume
• Reduces peak stormwater flows
• Helps reduce the risk of flooding
Figure 2. Benefits of green infrastructure practices
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Improved Air Quality/Climate Change
Quality of Life
i
Urban Heat Island
Green infrastructure practices that
include trees and other vegetation
can reduce the urban heat island
effect, which reduces energy use
and the incidence and severity of
heat-related illnesses.
Air Quality
Green infrastructure improves air qualit
by increasing vegetation, specifically trees,
that absorb air pollutants, including C02,
NO,, 0,, SO,, and PMln.
Green infrastructure s ability to
sequester carbon in vegetation can
help to meet greenhouse gas
emission goals by contributing to a
carbon sink.
Water Quality and Quantity
Water Conservation
Green infrastructure that incorporates locally adapted or native plants reduce the
need for irrigation, which reduces demand for potable and recycled water. Rain
barrels and cisterns that capture rainwater also reduce water use.
Green infrastructure can decrease the
frequency and severity of local flooding by
reducing stormwater discharge volumes and
rates.
stated green infrastructure can provide
itat for wildlife, particularly birds and
insects, even at small scales of
lementation.
Public Health
Residents have more recreational opportunities in the presence of large-scale
green space in their community, which can improve public health and well-bein
Green streets that include curb bump-outs at
pedestrian crossings improve pedestrian safety
by slowing traffic and decreasing the distance
that pedestrians must travel in the roadway.
Recr
Larger-scale green infrastructure facilities that
include public access, such as constructed
wetlands, offer recreational opportunities.
Property Aesthetics
Green infrastructure that includes attractive vegetation can improve property
aesthetics, which can translate into increased property values.
Educational Opportunities
Public Education
The visible nature of green
infrastructure offers enhanced
public education opportunities
to teach the community about
mitigating the adverse
environmental impacts of o
built environment. Signage is
used to inform viewers of the
features and functions of the
various types of facilities.
Figure 3. Additional green infrastructure benefits
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STEPS TO IMPLEMENT GREEN INFRASTRUCTURE PROJECTS
There are a few steps that municipalities should
take before undertaking a green infrastructure
project: reviewing planning documents and
codes, securing funding, planning for
maintenance, training staff, and identifying
potential projects. Figure 4 summarizes these
steps, and the remainder of this guide provides
more detail on specific actions that are needed
to begin planning, installing, and maintaining
green infrastructure. In the meantime,
municipalities can start thinking about
incorporating green infrastructure into projects
that have already been approved or are in the
planning stages. For example, if plans are
underway to repair sidewalks from tree root
damage, or a failing street tree is slated for
replacement, relatively minor modifications can
be made to the plans to include a tree box that
filters stormwater. Also, when work is being
done to repair/replace curbs, a grass swale in a
median could readily be modified into a
bioretention area.
Review Planning
Documents and Codes
Identify High-Visibility
Projects
Identify green infrastructure
opportunities and verify
that green infrastructure
can be readily incorporated
into municipal projects
Look for projects that
will show the public
the benefits of green
infrastructure
Identify Funding to
Implement and
Maintain Projects
Bring plan reviewers and
maintenance staff up to
speed on what is needed
A variety of funding
sources are available to
build and maintain green
infrastructure
Plan for Maintenance
Ensure the effectiveness
of green infrastructure
over the long term by
coordinating between
multiple agencies
Figure 4. Steps to implement green infrastructure
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Review Planning Documents and Codes
Before moving forward, it is advisable to first check if local codes, design
standards, or planning documents pose barriers to implementing green
infrastructure projects. If so, steps can be taken to remove those barriers by
adopting green infrastructure retrofit standards for major street projects or
adopting technical specifications and design templates for green infrastructure
on public property. Below are two resources that outline a process for
evaluating and revising development codes:
• The Center for Watershed Protection's (1998) Better Site Design: A
Handbook for Changing Development Rules in Your Community,
available at www.cwp.org, outlines 22 guidelines for better
developments and provides a detailed rationale for each principle. The
guide also examines current practices in local communities, details the
economic and environmental benefits of better site designs, and
presents case studies from around the country.
• EPA's (2009) Water Quality Scorecard: Incorporating Green
Infrastructure Practices At Municipal, Neighborhood, and Site Scales,
guides municipal staff through a review of relevant local codes and
ordinances across multiple municipal departments to ensure that
these codes work together to support a green infrastructure approach.
It can be downloaded at www.epa.gov/dced/pdf/2009 1208
wq scorecard.pdf.
Training may be needed for plan reviewers to identify green infrastructure
opportunities on public projects. The following are training opportunities
available online or in person:
• EPA offers a Green Infrastructure Webcast Series and other training
resources on their "Where Can I Get More Training?" website.
http://water.epa.gov/infrastructure/greeninfrastructure/
gi training.cfm
• North Carolina State University Cooperative Extension offers
Stormwater Education Events and Workshops throughout the year in
North Carolina in all aspects of green infrastructure design,
maintenance, and management. Upcoming events can be found at
http://www.bae.ncsu.edu/stormwater/training.htm.
EPA compiled a set of resources for planning for green infrastructure, including:
• Policy guides to assist municipalities in devising policy and planning
strategies to encourage, require, and implement green infrastructure:
http://water.epa.gov/infrastructure/greeninfrastructure/gi policy.cfm
• Design and implementation resources to help practitioners better
design, install, and maintain practices: http://water.epa.gov/
infrastructure/greeninfrastructure/gi design.cfm
• Modeling tools to assess green infrastructure performance, costs, and
benefits: http://water.epa.gov/infrastructure/greeninfrastructure/
gi modelingtools.cfm
Once you determine that green infrastructure can be
readily incorporated into municipal projects:
• Start by including small-scale green infrastructure practices in
individual municipal projects that are currently in the planning stage.
• Examine integrating green infrastructure into already-scheduled
maintenance projects as a way to reduce costs or to retrofit an area,
e.g., replacing or repairing infrastructure under streets.
• Consider requiring that all local road projects allocate a minimum
amount of the total project cost to green infrastructure elements.
• Incorporate green infrastructure requirements into competitive bid
packages for portions of projects that will be completed by outside
contractors.
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Identify Funding to Install and Maintain Projects
Green infrastructure projects range in cost from a few thousand dollars (e.g.,
curb cuts to direct flows to an open space area) up to millions of dollars for
large-scale, complex projects that treat a large drainage area. Costs will vary
based on the setting, as well: projects implemented on sites that were not
previously developed can be less expensive than those in redevelopment or
retrofit situations because of compacted soils, space constraints, utility
conflicts, and other site-specific factors that require specialized designs.
In addition to capital improvement funds that are typically used for municipal
projects, there are a variety of funding sources available to municipalities to
design and build green infrastructure projects and ensure long-term
maintenance, including borrowed funds, revenue from local sources, state and
federal grants, and private sector funding. The options discussed herein offer
individual funding sources but also may be blended to reflect a mix of local,
state, and federal funding mechanisms.
Because green infrastructure has multiple benefits in addition to improving
water quality, a key to finding funding and financing is to determine how a
green infrastructure project can meet the goals of various users and funding
sources. Green infrastructure has a greater chance of being funded by sources
other than traditional infrastructure sources because it can appeal to funders'
desires to achieve public health benefits, community revitalization, and habitat
creation, among other benefits. Figure 5 summarizes the sources, and Table 1
describes advantages and disadvantages of each.
Revenue Sources
Local revenue sources, such as stormwater utilities and special fees, are a
common funding option for municipal stormwater programs. Stormwater
utilities generate funds for the costs of implementing stormwater programs,
including regulatory compliance, planning, maintenance, and maintaining or
constructing infrastructure. Stormwater utilities are similar to water, sewer, or
fire districts in that they are stand-alone service units within a government that
generate revenues through user fees for services directly related to the control
and treatment of stormwater. Special fees may also be collected for permit
and plan reviews, and inspections and should be directly linked to stormwater
management. Further, special developer impact fees are a one-time fixed fee
charged for new development, used to compensate for the effects of new
development. Fees derived from special charges and stormwater utilities offer
a consistent source of dedicated funds for green infrastructure projects.
Grants, bonds, and loans are other options for financing green infrastructure
projects. Both private loans and public sources such as Clean Water State
Revolving Funds may be used to finance projects or fund development of a
utility or other related capital projects.
Funding Resources
EPA's report, Getting to Green: Paying for Green Infrastructure: Financing
Options and Resources for Local Decision-Makers, provides a description of
funding mechanisms available to support stormwater management
programs or finance individual projects, along with an overview of the
advantages and disadvantages of each approach. The report offers a
resource to local governments for determining how to finance green
infrastructure projects, http://www.epa.gov/nep
EPA's Managing Wet Weather with Green Infrastructure Municipal
Handbook: Funding Options provides local governments with a step-by-step
guide to growing green infrastructure in their communities. It identifies and
discusses stormwater fees and loan programs communities can use to fund
green infrastructure, http://water.epa.gov/infrastructure/
greeninfrastructure/upload/gi munichandbook funding.pdf
EPA also compiled a set of resources to help municipalities better
understand the cost-benefits of green infrastructure and to identify funding
opportunities. They include:
• Cost-benefit resources to conduct cost benefit analyses of green
infrastructure approaches. Completed analyses demonstrate that the
value of green infrastructure benefits can exceed those of gray.
http://water.epa.gov/infrastructure/greeninfrastructure/
gi costbenefits.cfm
• Funding opportunities including federal funding sources and funding
tools that project sponsors can use to locate a variety of federal
funding sources, http://water.epa.gov/infrastructure/
greeninfrastructure/gi funding.cfm
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Borrowing
Local Revenue
Grants
Bonds
Bonds are not a true revenue
source but are a means of
borrowing money. Green
bonds are a new source of
funding dedicated to
environmentally-friendly
projects, including clean water
projects
Fees
Funds raised through charges
for services such as
inspections and permits.
Funds raised through
developer impact fees are
one-time charges linked with
new development
State and Federal Grants
State and federal grants
provide additional funding for
water quality improvements
Private Sector
Public-Private Partnerships
Contractual agreements
between public agencies and
private sector entities that
allow for private sector
participation in stormwater
facility financing, planning,
design, construction, and
maintenance
Low interest loans may be
secured but are generally used
for planning and capital
projects
Stormwater Utility
Generates revenue through
user fees, which go into a
separate fund that only can be
used for stormwater services
Funds raised through
property, income, or sales
taxes that are paid into a
general fund
Figure 5. Funding sources for green infrastructure
Source: USEPA 2014
8
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Table 1. Advantages and disadvantages for green infrastructure funding sources
Funding Source I Advantages
Bonds
Loans
Public-Private
Partnerships
State and
Federal Grants
Stormwater
Utilities
Taxes/
General Funds
• Existing sources available for stormwater-related funding
• Can support construction-ready projects
• Can provide steady funding stream over the period of the bond
• Specific permit and inspection fees allows for more direct allocation of costs
for services provided
• Addresses potential Stormwater impacts related to new construction
• Existing sources available for stormwater-related funding
• Some programs offer low- or no-interest financing; private loans may be at
market rate
• Can reduce costs to government
• Significantly leverage public funding and government resources
• Ensure adequate, dedicated funding
• Improved O&M
• Shared risk
• Existing sources available for stormwater-related funding
• Does not require repayment
• Dedicated funding source
• Directly related to Stormwater impacts
• Sustainable, stable revenue
• Shared cost
• Improved watershed stewardship
• Addresses existing Stormwater issues
• Consistent from year-to-year
• Utilizes an existing funding system
Disadvantages
• One-time source of funds require individual approval for each issuance
• Require full repayment
• Possible interest charges
• Require dedicated repayment revenue stream
• May require design-level documents to be prepared in advance
• Likely require voter approval
• Can have high transaction costs relative to requested amount
• May require significant administrative preparation to issue
• Funding not available for larger projects or system-wide improvements
• Developer impact fees may be an unreliable source when development
slows (due to market downturns/contractions)
• Require administrative framework to assess and manage
• One-time source of funds
• Require full repayment
• Perceived loss of public control
• Assumption that private financing is more expensive and belief that
contract negotiations are difficult
• Competitive
• Typically one-time, project-specific, or time-constrained funds
• Often require a funding match
• Feasibility study required for implementation, fee structure, and
administration of utility
• Approval by vote of the local legislative body
• Perception by the public of a "tax on rain"
• Competition for funds
• Tax exempt properties do not contribute
• Not equitable system (does not fully reflect contribution of Stormwater
runoff)
Source: USEPA 2014
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Plan for Maintenance
Maintenance is critical to ensure the longevity and continued effectiveness of
green infrastructure practices. Below are ways municipalities can ensure that
green infrastructure is maintained over the long term.
Identify Staff Resources for Inspection and Maintenance
A municipality needs to determine if green infrastructure inspections and
maintenance can be accomplished with existing staff, if additional staff needs
to be hired, if specialized training is needed, or if it would be more cost-
effective to hire an experienced contractor. Consider which municipal
departments have the equipment and skillsets to inspect and maintain green
infrastructure, such as parks or public works. Training may be needed for both
municipal staff and contractors who perform inspections and maintenance.
Ma/nfenance Resources
The University of New Hampshire Stormwater Center created Maintenance
Guidelines and Checklists for pervious pavements, subsurface gravel
wetlands, and bioretention and tree box systems, which are available for
download at http://www.unh.edu/unhsc/maintenance.
The Oregon State University Extension Service hosts the Field Guide:
Maintaining Rain Gardens, Swales, and Stormwater Planters, which was
developed by numerous practitioners to assist contractors and
maintenance staff, http://extension.oregonstate.edu/stormwater/sites/
default/files/fieldguide.pdf.
American Rivers and Green for All's Staying Green: Strategies to Improve
Operations and Maintenance of Green Infrastructure in the Chesapeake
Bay Watershed: http://greenforall.org/focus/water/staying-green-
strategies-to-improve-operations-and-maintenance-of-green-
infrastructure-in-thechesapeake-bay-watershed.
EPA's The Importance of Operation and Maintenance for the Long-Term
Success of Green Infrastructure:
http://water.epa.gov/grants funding/cwsrf/upload/Green-lnfrastructure-
OM-Report.pdf.
Identify Maintenance Triggers
It is important to identify common problems that require non-routine
maintenance to aid inspectors in the field. Such maintenance triggers include
excess sediment accumulation, trash and debris, overgrown vegetation, dead
or diseased vegetation, signs of erosion, structural damage, or standing water
present more than 72 hours after a rain storm.
Update Standard Operating Procedures
If municipalities have standard operating procedures for routine landscape and
infrastructure maintenance, they should be updated to incorporate green
infrastructure maintenance triggers and remedial actions. Additionally, if
contractors are used to maintain practices, include specific language in
contracts that require training of maintenance crews. Maintenance schedules
should be set for each type of practice, and a tracking system should be in
place to ensure that maintenance is performed as prescribed.
Secure Funding for Maintenance
As with all infrastructure, expenses for green infrastructure maintenance are
ongoing. Sources of funding typically pursued for green infrastructure projects,
such as state and federal grants and loans, cannot be used for ongoing
maintenance. Local funding sources such as tax revenue or utility fees can
provide a stable source of funding for maintenance of green infrastructure
practices.
Enlist the Help of Volunteers
Some routine maintenance, such as removing trash and weeds from
bioretention areas, can be accomplished by partnering with neighborhood
organizations, greenway groups, or garden clubs to leverage their
funds/volunteers.
Procure Equipment
Municipalities should also consider the equipment needed to maintain green
infrastructure and determine if additional equipment is needed. Most of the
necessary equipment is typical of general landscape maintenance, as shown
below. Note that heavy equipment is discouraged for routine maintenance,
because it can cause soil compaction, which reduces the effectiveness of the
practices.
10
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Green Infrastructure Equipment Needs
Leaf litter, trash, debris, and sediment can be removed with rakes, shovels, and
trash grabbers.
Flat-blade shovels are especially useful for scraping accumulated sediment
from inlets and along curbs/gutters.
Vegetation can be kept healthy and attractive using pruning shears and weed
pullers, and mowers can be used to maintain turf grass at an appropriate
height.
Watering during the plant establishment period and in extended droughts can
be done with a hose, irrigation system, or tree watering bags.
A ladder is needed for inspecting roof drains that connect to rainwater
harvesting systems.
Permeable pavement is best maintained using a vacuum-powered street
sweeper, and replacement pavers are sometimes needed for repairs.
Heavy equipment, such as backhoes and front-end loaders, may be needed
infrequently if the facilities need to be replaced or if large amounts of sediment
have accumulated.
Routine maintenance on vegetated green
infrastructure practices is largely similar to general
landscape maintenance: removing trash, leaf litter,
and debris; keeping plants healthy; and cleaning out
accumulated sediment and pollutants. Regular
inspections will indicate if the practices are not
functioning as intended.
n
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Identify High-Visibility Projects Where Possible
Projects located in high traffic areas not only exhibit a locality's
commitment to green infrastructure, but allow residents to experience the
benefits of these practices first hand. In addition, these projects provide an
opportunity to educate the community about that particular green
infrastructure practice while garnering support for future projects.
The following section is a series of fact sheets that highlight short-term,
relatively easy-to-install projects that can serve as a starting point for
implementing green infrastructure. Figure 6 summarizes the project types
showcased in the fact sheets.
The projects are intended to have a large public impact with lower capital
investment and maintenance needs. Each fact sheet presents:
• An overview of the project
• The types of green infrastructure that are appropriate for the
setting
• Potential project partners
• Relative costs and project complexity
• Anticipated benefits
• Expected maintenance
• Case study examples of similar projects implemented in
communities throughout the U.S.
Projects should use native vegetation and be
located in high visibility areas such as City Hall,
the local farmers market, a public park, the
community library, or schools.
12
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OPPORTUNITIES TO INTEGRATE GREEN INFRASTRUCTURE
Fact Sheet 5:
Create
stormwater
microparks
Fact Sheet 4:
Design traffic
safety features
to manage
stormwater
and improve
aesthetics
Fact Sheet 1:
Build in green features
during routine right-of-
way maintenance and
operations
Fact Sheet 2:
Build or
retrofit parking
facilities to be
greener
Build rain gardens
at public facilities
Figure 6. Green infrastructure project fact sheets
13
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RESOURCES
Code Review
Center for Watershed Protection. 1998. Better Site Design: A Handbook for
Changing Development Rules in Your Community. Center for
Watershed Protection, Ellicott City, MD.
USEPA. 2009. Water Quality Scorecard: Incorporating Green Infrastructure
Practices at Municipal, Neighborhood, and Site Scales. Accessed
December 2014. http://www.epa.gov/dced/pdf/
2009 1208 wq scorecard.pdf.
Economics
American Rivers, Water Environment Federation, the American Society of
Landscape Architects, and ECONorthwest. 2012. Banking on Green: A
Look at How Green Infrastructure Can Save Municipalities Money and
Provide Economic Benefits Community-Wide. A Joint Report, April
2012. Accessed December 2014.
http://www.americanrivers.org/assets/pdfs/reports-and-
publications/banking-on-green-report.pdf.
Center for Neighborhood Technology and American Rivers. 2010. The Value of
Green Infrastructure: A Guide to Recognizing its Economic,
Environmental, and Social Benefits. Accessed December 2014.
http://www.americanrivers.org/wp-content/uploads/2013/09/Value-
of-Green-lnfrastructure. pdf?c8031c.
USEPA. 2013. Case Studies Analyzing the Economic Benefits of Low Impact
Development and Green Infrastructure Programs. EPA 841-R-13-004.
August 2013. Washington, D.C. Accessed December 2014.
http://water.epa.gov/polwaste/green/upload/lid-gi-
programs report 8-6-13 combined.pdf.
USEPA. 2013. Reducing Stormwater Costs through Low Impact Development
(LID) Strategies and Practices. Publication Number EPA841-F-07-006,
December 2007. Accessed December 2014.
http://water.epa.gov/polwaste/green/costs07 index.cfm.
Funding
USEPA. 2008. Managing Wet Weather with Green Infrastructure Municipal
Handbook: Funding Options. EPA-833-F-08-007. September 2008.
Accessed December 2014. http://water.epa.gov/infrastructure/
greeninfrastructure/upload/gi munichandbook funding.pdf.
USEPA. 2014. Getting to Green: Paying for Green Infrastructure: Financing
Options and Resources for Local Decision-Makers. U.S. Environmental
Protection Agency, National Estuary Program, Washington, DC.
Accessed December 2014. http://www.epa.gov/nep.
USEPA. 2014. Water: Green Infrastructure—Cost-Benefit Resources. Accessed
December 2014. http://woter.epa.gov/infrastructure/
greeninfrastructure/gi costbenefits.cfm.
USEPA. 2014. Water: Green Infrastructure—Funding Opportunities. Accessed
December 2014. http://water.epa.gov/infrastructure/
greeninfrastructure/gi funding.cfm.
Maintenance
American Rivers and Green for All. No date. Staying Green: Strategies to
Improve Operations and Maintenance of Green Infrastructure in the
Chesapeake Bay Watershed. Accessed December 2014.
http://www.americanrivers.org/assets/pdfs/reports-and-
publications/staying-green-strategies-improve-operations-and-
maintenance.pdf.
Cahill, M., R. Emanuel, T. Gilbertson, C. Harlan, D. Hottenroth, S. Peterson, H.
Stevens, C. Petersen, D. Richardson, G. Shaloum, and C. Stoughton.
2013. Field Guide: Maintaining Rain Gardens, Swales and Stormwater
Planters. Accessed December 2014. http://extension.oregonstate.edu/
storm water/sites/default/files/f ieldguide.pdf.
14
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UNH. 2010. UNHStormwater Center—Maintenance. University of New
Hampshire Stormwater Center. Accessed December 2014.
http://www.unh.edu/unhsc/maintenance.
USEPA. 2013. The Importance of Operation and Maintenance for the Long-Term
Success of Green Infrastructure: A Review of Green Infrastructure O&M
Practices in ARRA Clean Water State Revolving Fund Projects. PA-832-
R-12-007, March 2013. Accessed December 2014.
http://water.epa.gov/grants funding/cwsrf/upload/
Green-lnfrastructure-OM-Report.pdf.
Planning
USEPA. 2014. Water: Green Infrastructure—Design and Implementation
Resources. Accessed December 2014.
http://water.epa.gov/infrastructure/greeninfrastructure/
gi design.cfm.
USEPA. 2014. Water: Green Infrastructure—Modeling Tools. Accessed
December 2014.
http://water.epa.gov/infrastructure/greeninfrastructure/
gi modelingtools.cfm.
USEPA. 2014. Water: Green Infrastructure—Policy Guides. Accessed December
2014. http://water.epa.gov/infrastructure/greeninfrastructure/
gi policy.cfm.
Training
NCSU. No date. Stormwater Engineering Group: Upcoming NCSU Stormwater
Education Events and Workshops. North Carolina State University
Cooperative Extension. Accessed December 2014.
http://www.bae.ncsu.edu/stormwater/training.htm.
USEPA. 2014. Where Can I Get More Training? Accessed December 2014.
http://water.epa.gov/infrastructure/greeninfrastructure/
gi training.cfm.
15
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Build in Green Features during
Routine Right-of-Way Maintenance
and Operations
FACT SHEET #1
A variety of green infrastructure practices can be used to manage stormwater and enhance the
walkability and aesthetics of streets. Green infrastructure implemented in the street right-of-
way can be used to
Reduce impervious area
Infiltrate/filter runoff from the street
and adjacent property
Provide shade using trees
Improve air quality
Reduce the urban heat island effect
Create a sense of place
Showcase public art
Calm traffic
Provide wildlife habitat
Create a welcoming area
Enhance aesthetics
GREEN INFRASTRUCTURE OPPORTUNITIES
Permeable pavement
Bioretention
Trees
Choose permeable pavement for lower volume traffic areas, such as
parking spaces, bike lanes, sidewalks, medians, and alleys.
Install bioretention in the right-of-way between the curb and
sidewalk, in curb bump-outs, and in medians or roundabouts to filter
stormwater and beautify the streetscape.
Plant trees or install tree boxes in the right-of-way between the curb
and sidewalk, in curb bump-outs, in medians or roundabouts for
enhanced stormwater infiltration, shade, and aesthetics.
Reduce impervious area Replace pavement in medians, centerline safety strips, and
roundabouts with pervious surfaces, and create shallow depressions
to capture more runoff.
Project Complexity
Medium
T/meframe
1-3 years
Installation Costs
Factors Affecting Costs
• Scale of the project
• Retrofit, infill, or new development
setting
• Green infrastructure practices selected
• If existing utilities require relocation or
special designs
$50,000 and up, depending on site and scale • Performance goals
Financing Opportunities
• Capital improvement funds
• Property tax assessments
• Stormwater utility fees
• State or private grants
• State revolving loans
• Private funding
• Bonds
• Federal funds
Necessary Maintenance
• Hand weeding
• Debris and sediment removal
• Plant trimming and pruning
• Plant replacement
• Vacuum sweeping of permeable
pavement
• Soil replacement
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THINGS TO CONSIDER BEFOREHAND
Design for public safety and access
Green streets and alleys are most cost-effective to complete in conjunction with
necessary street or infrastructure improvements or rehabilitation projects.
Select plants that do not impede driver sight lines or hide pedestrians from view.
Design practices with sufficient access and features that make maintenance easier, such
as inlets that are easy to clean.
Choose vegetation that is densely rooted to filter debris and pollutants.
Use salt-tolerant plants where salt will be used for snow and ice control.
Select native or locally adapted plants where possible to reduce maintenance and help
to ensure longevity.
Use wheel stops or curb cuts to ensure that cars do not drive over bioretention areas.
Where possible, site stormwater retrofits in locations where pavement already drains in
the right direction to avoid regrading.
POTENTIAL PROJECT PARTNERS
Downtown business associations, civic leagues, neighborhood associations, and
environmental groups can provide input into the design and placement of the practices for
maximum community benefit and can provide volunteer resources to keep the facilities free of
trash and weeds. Partner groups could apply for grants to assist in the design or installation of
key portions of the project or share costs on portions of the project. For example, an arts
council might be willing to partner with a municipality to convert a pervious plaza into a park
with an interpretive rain garden if the space incorporated public art.
FOR MORE INFORMATION
National Complete Streets Coalition: www.smartgrowthamerica.org/complete-streets
Federal Highway Administration's Street Design: Part 1 - Complete Streets:
www.fhwa.dot.gov/publications/10iulaug/03.cfm and Street Design: Part 2 -
Sustainable Streets: www.fhwa.dot.gov/publications/llmarapr/02.cfm
Portland Green Streets website: www.portlandoregon.gov/bes/44407
Seattle Streetscape Design Guidelines: Green Streets:
www.seattle.gov/transportation/rowmanual/manual/6 2.asp
Permeable pavement can be used for lower volume traffic
areas such as parking and bicycle lanes.
Photo credit: Dan Christian, Tetra Tech, Inc.
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CASE STUDY: NORTH STREET GREEN RETROFIT—PITTSFIELD, MASSACHUSETTS
The City of Pittsfield, Massachusetts is working to retrofit existing roadways with green street
technology for stormwater management. One portion of the city's larger project is a 1,200 foot
section of North Street in urban Pittsfield, where an existing streetscape plan included plantings
and bump-outs for traffic calming. The city updated the original plan to incorporate three rain
gardens to help manage stormwater. To successfully execute the rain gardens, the city needed to
consider both urban conditions and local weather conditions. For example, the rain gardens were
adapted for bioinfiltration with a specified medium, mulch, and appropriate plants that could
withstand harsh New England conditions while aiding in pollutant removal.
In total, the three rain gardens covered an area of 520 square feet. The addition of rain gardens to
North Street's renovation plan added the benefit of reducing stormwater pollutants from entering
the West Branch of the Housatonic River. The rain gardens also reduce the volume of stormwater
that is captured in catch basins and pumped to the municipal stormwater system with no
treatment (Ogden et al. 2010). In addition to stormwater benefits, the retrofit achieves street
calming measures in a downtown area that is emerging as an artistic and cultural hub in Pittsfield.
The project successfully contributes to the goal of linking the city's dense urban center with green
infrastructure (Greene et al. 2005). The cost of constructing the rain gardens along North Street
totaled $44,379 (Ogden et al. 2010).
References:
Greene, C., S.P. Barr, S. Ibendahl, W. Sedovic, R.G. Shibley, and A. Livingston. 2005. Pittsfield
SDAT: Sustainable Urbanism in the Heart of the Berkshires. Sustainable Design
Assessment Team, http://www.aia.org/aiaucmp/groups/aia/documents/pdf/
aias078159.pdf.
Ogden, K.M., M.J. Seluga, and B.E. Eisenberg. 2010. Green street retrofits in the Northeast: Design
and acceptance challenges for stormwater management retrofits. Low Impact
Development 2010: pp. 628-641.
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CASE STUDY: PLAINFIELD AVENUE—GRAND RAPIDS, MICHIGAN
In 2012, the City of Grand Rapids, Michigan updated the design of Plainfield
Avenue to incorporate stormwater management features. The arterial
roadway was redesigned to incorporate linear below-grade bioretention
islands in the median that are designed to capture the first 0.5 inch of rainfall,
eliminating the discharges to the storm sewer system from the most frequently
occurring small storms. The islands effectively reduce 420,000 cubic feet of
runoff, 60% of sediment, and 65% of phosphorus loading that would otherwise
directly enter Grand River in flash flood events every year. In addition to runoff
reduction and water quality benefits, the Plainfield Avenue island also serves
the community by increasing pedestrian safety, calming traffic, and improving
the area's aesthetics.
Design and construction costs of the Plainfield Avenue island totaled $264,000,
which was funded by a collaboration of federal, local and private sources.
Funding contribution sources included the Michigan Department of
Transportation Enhancement Grant, Creston Neighborhood Association,
Creston Business Association, Fishbeck, Thompson, Carr & Huber, Inc., and the
West Michigan Environmental Action Council. In addition to capital costs,
maintenance is expected to cost about $1,500 annually, $30,000 of which was
endowed by the Cranston Business Association (SEMCOG 2013).
Reference:
SEMCOG. 2013. Great Lakes Green Streets Guidebook: A Compilation of Road
Projects Using Green Infrastructure, http://www.semcog.org/
uploadedFiles/Programs_and_Projects/Water/Stormwater/
GLGI%20Guidebook_web.pdf.
One of seven bioretention islands on Plainfield Avenue.
Photo credit: David Kidd, Governing Magazine.
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Build or Retrofit Parking Facilities to
be Greener
FACT SHEET #2
Parking lot pavement at municipal facilities constitutes a substantial portion of urban and
suburban impervious surface area. These lots, as well as medians, curbs, and bump-outs,
present opportunities for municipalities to incorporate green infrastructure features into new
parking lot designs or retrofit existing parking lots with green infrastructure to capture runoff
from parking spaces, parking lanes, and buildings before it leaves the site. Greener parking can
be used to:
• Reduce effective impervious area
• Infiltrate runoff from parking lanes and
stalls
• Improve parking lot drainage
• Provide shade when trees are used
GREEN INFRASTRUCTURE OPPORTUNITIES
Improve pedestrian safety with curb
bump-outs to reduce crossing
distances
Improve aesthetics
Provide wildlife habitat
Permeable pavement
Bioretention
Trees
Choose permeable pavement for areas with low volume traffic, such
as parking stalls, fire lanes, pedestrian walkways, and overflow
parking.
Install or convert areas between parking rows to bioswales. Install
bioretention along the parking lot perimeter and in corners where
cars cannot park. Use curb bump-outs with bioretention at the end
of stalls to calm traffic and reduce pedestrian crossing distances.
Plant trees between parking rows, in bump-outs, and along
perimeters. Use stormwater tree boxes in wide sidewalks and
entrance courts.
Reduce impervious area Create shallow depressions in medians, centerline safety strips, and
roundabouts and plant with low-profile vegetation. For retrofits,
redirect stormwater flow from storm sewers to bioretention areas.
Project Complexity
Medium
T/meframe
1-3 years
Installation Costs
$10,000 and up, depending on site and scale
Factors Affecting Costs
• Scale of the project
• Retrofit, infill, or new development
setting
• Green infrastructure practices selected
• If existing utilities require relocation or
special designs
Financing Opportunities
• Capital improvement funds
• Property tax assessments
• Smart growth grants
• State or private grants
• State revolving loans
• Issuing bonds
Necessary Maintenance
• Hand weeding
• Debris and sediment removal
• Plant trimming and pruning
• Plant replacement
• Vacuum sweeping of permeable
pavement
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THINGS TO CONSIDER BEFOREHAND
Select plants that do not impede driver sight lines or hide pedestrians from view.
Use salt-tolerant plants where salt will be used for snow and ice control.
Select native or locally adapted plants where possible to reduce maintenance and help to
ensure longevity.
Design practices with sufficient access and features that make maintenance easier, such
as paved forebays for easy sediment removal.
Choose vegetation that is densely rooted to filter debris and pollutants.
Use wheel stops or curbs with cuts to ensure that cars do not drive over bioretention.
Grade drainage to slope toward bioretention areas or permeable pavement; avoid
concentrated flows.
Design curb cuts and inflow areas to manage adequate flow.
POTENTIAL PROJECT PARTNERS
Seek input from business improvement districts and neighborhood associations regarding
desired features and amenities of green parking areas. Solicit funding from business
associations to improve municipal parking areas serving a commercial district. Engage civic
leagues, environmental groups, and garden clubs to provide support and volunteers to help
build and maintain green infrastructure. Provide municipal incentives to private property
owners to build new parking with green features. Consider provision of design assistance and
expedited permit reviews.
FOR MORE INFORMATION
EPA Office of Sustainable Development Green Parking Lot Fact Sheet:
www.epa.gov/regionn2/sustainability/parking/index.html
Green Parking Council: www.greenparkingcouncil.org
Parking Spaces/Community Places: Finding the Balance through Smart Growth Solutions:
www.epa.gov/smartgrowth/pdf/EPAParkingSpaces06.pdf
A bioretention area treats runoff from the parking surface and
is planted with low-maintenance vegetation.
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CASE STUDY: LANCASTER PARKING LOT TRANSFORMATIONS—LANCASTER, PENNSYLVANIA
The City of Lancaster, Pennsylvania has taken on a series of four
city-owned parking lot renovations in the city's southeast
region. The renovated parking lot designs incorporate
stormwater management features. Storm^/ater measures
added to the parking lots on Plum Street, Dauphon Street,
Pennsylvania Avenue, and Mifflin Street include repaving with
permeable concrete, tree plantings, rain gardens, and
reorganization of parking area placement to accommodate
additional vehicles without expanding paved surface area (City
of Lancaster 2014). The four renovated parking lots are each
estimated to intercept between 600,000 and 700,000 gallons of
stormwater that drains from surrounding blocks every year.
Prior to the renovations, stormwater entered the sewer system
and was overwhelming the treatment capacity of the facility,
leading to raw sewage discharges into the Conestoga River, and
ultimately the Chesapeake Bay (Harris 2011). Each of the
parking lot renovations is estimated to cost about $160,000,
with funding provided by a loan from the Pennsylvania
Infrastructure Investment Authority and grant funding from the
National Fish and Wildlife Foundation. The parking lot
renovations are part of a series of green projects that the City of
Lancaster implemented as an alternative to a $300 million grey
infrastructure approach of building storage tanks to hold
overflow until it could be treated (Harris 2011).
References:
City of Lancaster. 2014. Parking Lots: Southeast Parking Lot
Transformation, http://www.saveitlancaster.com/local-
projects/parking-lots/.
Harris, B. 2011, November 27. Lancaster city alley gets 'green' makeover. Lancaster Online, http://lancasteronline.com/news/lancaster-city-alley-gets-green-makeover/
article f05a7df8-8a75-5ab5-b799-c251c92905ec.html.
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CASE STUDY: ST. LANDRY PARISH VISITOR'S CENTER—ST. LANDRY PARISH, LOUISIANA
The St. Landry Parish Visitor Center in Louisiana, was constructed to achieve
LEED certification by incorporating sustainable materials with both aesthetic
and functional purposes. For example, construction incorporated recycled
building materials and stormwater control measures including permeable
recycled asphalt in the conservatively sized parking lots. Stormwater runoff
from the parking lot and roof is entirely retained on site by cisterns, rain
gardens, and a series of bog ponds that collect and filter runoff. Native plants
landscape the building's exterior, reducing maintenance and eliminating
irrigation needs. In addition to stormwater control features, the visitor center
incorporates energy saving measures, such as wind turbines, daylighting, low-
energy insulated glazing, minimized east and west exposure to reduce solar
heat gain, personal temperature controls, dual flush toilets, and energy star
rated appliances. The resulting visitor center complements the existing
landscape in a way that maximizes the natural meadow and landscape space
and showcases sustainable strategies that are not only effective from ecological
and monetary standpoints, but also serves as an educational example of the
benefits of green infrastructure. The project was funded through public funding
from federal and parish sources. Costs totaled approximately $330,000, with
$130,000 allocated to parking sitework, walkways, and bioswales. The
remaining $200,000 was split equally between landscaping, and utilities,
drainage, gabion walls, and dirtwork. The stormwater measures incorporated in
the visitor center are estimated to provide over 10% savings in construction
costs compared to traditional site design and development and should result in
long-term savings from landscaping that will not require potable water for
irrigation.
Reference:
ASIA. No date. Green Infrastructure & Stormwater Management Case Study: St. Landry Parish Visitor's Center. http://www.asla.org/uploadedFiles/CMS/Advocacy/
Federal_Government_Affairs/Stormwater_Case_Studies/Stormwater%20Case%20128%20St%20Landry%20Parish%20Visitor's%20Center,%20LA.pdf.
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Build Green Infrastructure at
Public Facilities
FACT SHEET #3
Municipal buildings, libraries, public parking lots, schools, community centers and parks offer
opportunities for highly visible green infrastructure retrofits. Projects can be undertaken as part
of the capital improvement process, ideally in conjunction with other needed maintenance such
as building additions and modifications, repaving, re-landscaping, or infrastructure repair or
replacement. Green infrastructure offers the following benefits:
• Reductions in impervious area
• Infiltration of runoff from paved areas
and rooftops
• Public education opportunities (signage)
• Shade when trees are used
• Wildlife habitat
• Welcoming area
• Creation of park-like areas
GREEN INFRASTRUCTURE OPPORTUNITIES
Permeable pavement
Flow-through planters
Bioretention
Trees
Rainwater harvesting
Reduce impervious area
Project Complexity
Medium
T/meframe
1-3 years
Installation Costs
$50,000 and up, depending on site
and scale
Choose permeable pavement for areas with low volume traffic, such
as parking stalls, fire lanes, sidewalks, medians, and alleys.
Install fully-lined flow-through planters at the foot of buildings to
slow the flow of runoff from rooftops to the storm drain system.
Replace paved and gravel areas between the curb and sidewalk, in
parking islands and medians, and parking aisles with shallow
depressions planted with low-maintenance vegetation.
Plant trees or install tree boxes in the right-of-way between the curb
and sidewalk, in curb bump-outs, in medians or roundabouts, and in
landscaped areas to provide shade and improve aesthetics.
Install cisterns and rain barrels to collect runoff from roof
downspouts for nonpotable reuse (e.g., irrigation, wash water).
Convert unused parking to open space or bioretention. Replace
pavement in medians and traffic islands with vegetation.
Factors Affecting Costs
• Scale of the project
• Retrofit, infill, or new development
setting
• Green infrastructure practices selected
• If existing utilities require relocation or
special designs
Financing Opportunities
• Property tax assessments
• Stormwater utilities
• Smart growth grants
• State and private grants
• State revolving loans
• Issuing bonds
Necessary Maintenance
• Hand weeding
• Debris and sediment removal
• Plant trimming and pruning
• Plant replacement
• Vacuum sweeping of permeable
pavement
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THINGS TO CONSIDER BEFOREHAND
Retrofitting public property to include green infrastructure features is most efficient and
cost-effective when it occurs in conjunction with other needed maintenance and
upgrades.
Incorporate signage to educate the public about how stormwater is managed by the
facilities.
Choose vegetation that is densely rooted to filter debris and pollutants.
Use salt-tolerant plants where salt will be used for snow and ice control.
Select native or locally adapted plants where possible to reduce maintenance and help to
ensure longevity.
Where possible, site stormwater retrofits in locations where pavement already drains in
the right direction to avoid regrading.
Site and design practices with sufficient access and features that make maintenance
easier, e.g., include paved forebays for easy sediment removal.
POTENTIAL PROJECT PARTNERS
School districts and students, parent/teacher associations, friends of the library, and
downtown business associations can provide input into the design and placement of the
practices for maximum utility and can provide volunteer resources to keep the facilities free of
trash and weeds. Partner groups could apply for grants to assist in the design or installation of
key portions of the project or share costs. Students can study, monitor, and maintain water
quality facilities on school grounds as part of their science curriculum.
FOR MORE INFORMATION
EPA Green Infrastructure Page: http://water.epa.gov/infrastructure/greeninfrastructure
American Society of Landscape Architects Green Infrastructure Page:
http://www.asla.org/greeninfrastructure.aspx and Stormwater Case Studies:
http://www.asla.org/stormwatercasestudies.aspx
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CASE STUDY: NORTH AND SOUTH RIVERS WATERSHED ASSOCIATION RAIN GARDENS—SOUTH SHORE, MASSACHUSETTS
The South Shore Region of the Massachusetts Bays National Estuary Program (MassBays) and its host organization,
the North and South Rivers Watershed Association (NSRWA), have worked to implement and encourage green
infrastructure techniques throughout the region. Between 2006 and 2008, MassBays/NSRWA installed a rain
garden in nearly every town on the South Shore. Partnering with local organizations to identify areas that receive
high volumes of stormwater runoff, MassBays/NSRWA installed rain gardens in key public locations like schools
and libraries in towns including Hull, Weymouth, Hingham, Norwell, Hanover, Pembroke, Scituate, Marshfield,
Duxbury, Kingston, and Plymouth. Funding for the rain gardens was sourced by a 104b3 grant from EPA and
MassDEP. MassBays/NSRWA also helped the Towns of Kingston and Pembroke obtain EPA 319 grants through
MassDEP in 2006 to install green infrastructure practices like rain gardens, permeable pavement and pavers, and
plastic grid at the Kingston Intermediate School and Pembroke's Town Hall and Oldham Pond boat ramp. In 2010,
NSRWA/MBP worked with the Town of Marshfield to secure a 604b ARRA grant from the EPA and MassDEP for
bacterial source tracking in the South River and subsequent design of stormwater BMPs to remediate bacterial
pollution.
In 2011, MassBays provided funding to the town of Kingston received funding to evaluate the feasibility of
installing green infrastructure at stormwater outfalls that discharge into the Jones River and Kingston Bay to
address deteriorating water quality that resulted in restrictions on shellfish harvesting. Beginning with 35 known
stormwater outfalls to the Jones River, the town identified a subset at which to perform water quality sampling
during two storm events. Based upon the results of the sampling, local site conditions, and proximity of the site to
the Bay, green infrastructure-based BMPs for 10 of the sites were brought to a conceptual design stage. Since
2012, detailed engineering designs have been developed for the most promising sites with funding from the state
Office of Coastal Zone Management, and two BMPs are now in place. Based upon the conceptual designs, a
materials quantity takeoff was performed and a construction cost estimate developed for each location.
Construction costs were increased by 15% to cover contingencies and 25% to cover the cost of services for final
design and construction inspection. The total construction cost, including final engineering design, construction,
and construction inspection for all ten locations, was estimated to be $556,392. Based upon the matrix analysis
results, two sites were selected for preliminary design. Two drawings were completed for the preliminary designs.
Preliminary design at the paved swale on Delano Avenue was proposed to be comprised of a trench drain at the
toe of the road, two 5' drain manholes with 4' sumps, and two 18' diameter rain gardens. Based on the preliminary
designs, a total construction cost estimate of $268,778 has been calculated for the two catchment areas. The total
construction cost includes 10% for construction contingencies and 25% for services related to design and
construction inspection. The total construction cost estimate to mitigate all twelve outfalls is $825,170.
Rain garden off of Delano Avenue in Kingston,
MA.
Photo credits: Maureen Thomas, Town of Kingston.
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CASE STUDY: BAMBOO BROOK HISTORIC WATER SYSTEM RESTORATION—MORRIS COUNTY, NEW JERSEY
The Bamboo Brook Outdoor Education Center, formerly Merchinston Farm,
underwent a restoration effort in 2009 to restore the existing but deteriorated
system of scenic pools, streams, and tanks constructed by the original owner, a
pioneer of landscape architecture. The design included water conservation measures
such as bioswales, native plants, and rainwater harvesting devices. The system can
now capture the runoff generated by a 2-year storm event. The restoration of the
stormwater project was estimated between $1M and $5M, with public funding from
state, local, New Jersey grant and Morris County Park Commission funding. The state
estimates that 7 employment years were created by this project. To complete the
project, approximately 6,346 hours were needed for planning and design; 6,820
hours for construction, and approximately 4,000 hours needed for annual
maintenance.
Reference:
ASIA. No date. Green Infrastructure & Stormwater Management Case Study:
Bamboo Brook Historic Water System Restoration.
http://www.asla. org/uploadedFiles/CMS/Advocacy/Federal_Government_A
ffairs/Stormwater_Case_Studies/Stormwater%20Case%20055%20Bamboo
%20Brook%20Historic%20Water%20System%20Restoration,%20Morris%20
County,%20NJ.pdf.
'
Bamboo Brook Outdoor Education Center restoration.
Photo credit: Patricia M. O'Donnell, Heritage Landscapes LLC.
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Design Traffic Safety Features to
Manage Stormwater and
Improve Aesthetics
FACT SHEET #4
Municipalities are tasked with ensuring that vehicles, pedestrians, and cyclists are safe on roads
and sidewalks. Traffic-calming features, such as chicanes, roundabouts, and curb bump-outs,
slow vehicle traffic and enhance pedestrian safety by drawing attention to pedestrians and
reducing the distance pedestrians must travel to cross the road. These safety features offer
opportunities to integrate green infrastructure. By building new streets and retrofitting existing
streets with green infrastructure traffic calming measures, a municipality can do the following:
• Reduce street and sidewalk impervious
area
• Infiltrate runoff from streets, sidewalks,
and adjacent properties
• Calm vehicle traffic
Enhance pedestrian safety
Encourage multimodal transportation
Improve streetscape aesthetics
Provide wildlife habitat
Improve water quality
GREEN INFRASTRUCTURE OPPORTUNITIES
Bioretention Use bioswale islands at skewed intersections to decrease impervious
area and make traffic paths more obvious. Install bioretention
chicanes and bumpouts to slow vehicle traffic. Install curb bump-outs
with bioretention at pedestrian crossings for increased visibility,
safety, and convenience. Use narrow strips of bioretention (i.e.,
green gutters) to provide a visual barrier and buffer between bicycle
and vehicle lanes.
Trees Incorporate street trees for shade and aesthetic benefits.
Permeable pavement Use permeable pavement for bicycle lanes to distinguish them from automobile travel lanes and to reduce standing water and ice formation.
Reduce impervious area Convert raised medians and traffic islands to swales with curb cuts. Replace the center of paved cul-de-sacs with vegetated, shallow roundabouts.
Project Complexity
Low to medium
T/meframe
Months to several years depending
on complexity
Installation Costs
$10,000 and up, depending on site
and scale
Factors Affecting Costs
• Scale of the project
• Retrofit, infill, or new development
setting
• Green infrastructure practices selected
• If existing utilities require relocation or
special designs
Financing Opportunities
• Property tax assessments
• Stormwater utilities
• Transportation planning grants
• State and private grants
• Issuing bonds
Necessary Maintenance
• Hand weeding
• Debris and sediment removal
• Plant trimming and pruning
• Plant replacement
• Vacuum sweeping of permeable
pavement
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THINGS TO CONSIDER BEFOREHAND
Ensure that traffic-calming measures do not interfere with emergency response vehicles.
Select vegetation that will not impede driver sight lines or block pedestrians from view.
Use salt-tolerant plants where salt will be used for snow and ice control.
Select native or locally adapted plants where possible to reduce maintenance and help to
ensure longevity.
Select vegetation that will be less likely to be stolen.
Design facilities to manage the appropriate flow volumes to avoid blow-outs.
Design to allow easy maintenance and reduce the potential for clogging.
Consider a pilot project to incorporate green infrastructure and traffic calming features
at an intersection or along a residential or commercial corridor that has a history of
conflicts between drivers, cyclists, and pedestrians.
Where possible, site stormwater retrofits in locations where pavement already drains in
the right direction to eliminate the need for regrading.
POTENTIAL PROJECT PARTNERS
Residents can help municipalities identify areas of known conflicts between vehicles, cyclists,
and pedestrians. Business associations benefit from slower traffic in commercial corridors and
measures that encourage foot traffic. Public health organizations support measures that
encourage walking and biking and reduce injuries to pedestrians. State highway departments
can partner with municipalities to undertake projects on state-managed roads.
FOR MORE INFORMATION
National Complete Streets Coalition: www.smartgrowthamerica.org/complete-streets
Federal Highway Administration's Street Design: Part 1-Complete Streets:
www.fhwa.dot.gov/publications/10iulaug/03.cfm and Street Design: Part 2 - Sustainable
Streets: www.fhwa.dot.gov/publications/llmarapr/02.cfm
Portland Green Streets website: www.portlandoregon.gov/bes/44407
Seattle Streetscape Design Guidelines: Green Streets:
www.Seattle.gov/transportation/rowmanual/manual/6 2.asp
This bioretention bump-out captures runoff and slows traffic on
a road frequented by cyclists and pedestrians.
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CASE STUDY: UPTOWN CIRCLE TRAFFIC CALMING AND BIORETENTION PROJECT—NORMAL, ILLINOIS
Uptown Circle unites four Central Business District streets in Normal, Illinois. Completed as part of
a larger business district redevelopment plan, the completed traffic circle transforms a formerly
awkward intersection into a shared environment for motorists, pedestrians, and bicyclists, while
providing community benefits such as slowed traffic, improved air quality, and reduced and
mitigated stormwater runoff (Context Sensitive Solutions.org 2005).
The center of the circle provides innovative stormwater management by collecting stormwater
using an obsolete storm sewer converted into a cistern. Subsequently, the stormwater flows via a
series of filters into two subsurface channels where the water is filtered by plants in the outer
channel and is slowed by a textured surface in the inner channel. SilvaCell™ trees and a grassy
area enhance aesthetics and create a park-like setting (Context Sensitive Solutions.org 2005). The
cistern beneath the traffic circle holds as much as 75,000 gallons of stormwater collected from the
nearly 3 acres of paved surfaces draining to the system (Context Sensitive Solutions.org, no date).
The project cost $1.5 million for Uptown Circle (Landscape Architecture Foundation, no date). The
Landscape Architecture Foundation (no date) estimates many cost savings and environmental
benefits from the traffic circle construction that include:
• Capture and reuse of 1.4 million gallons of stormwater onsite resulting in an estimated
$7,600 annual potable water savings from the 58,800 square foot area.
• 1.4 million gallon reduction in stormwater load entering the municipal storm sewer from
stormwater reuse for irrigation, onsite water feature, groundwater recharge, and water
uptake by onsite green features (e.g., tree wells, planter areas, or underground storage
facilities).
• Improved onsite water quality resulting from the sand, UV and bog filter systems.
Estimates suggest that 91% of total suspended solids, 79% of total phosphorous, and 64%
of total nitrogen can be removed each pass through the various filtration systems.
• Expected cost savings of over $60,000, across a 50 year period, from increased street tree
lifespan resulting from the use of underground structural cells; thus, reducing costs associated with new street tree purchase and installation.
• Expected average carbon sequestration of more than 103 pounds of carbon annually from each of the 104 newly planted trees.
• Increase in Uptown financing district property values. Property values in the financing district increased by $1.5 million (or 9%) from 2009 to 2010, which translates to a
31% increase from 2004.
• Increase in revenue of more than $680,000 from conference events held in the newly developed multi-phase, mixed use Uptown Redevelopment project.
References:
Context Sensitive Solutions.org. 2005. Uptown Circle. http://contextsensitivesolutions.org/content/case_studies/uptown_circle/.
Context Sensitive Solutions.org. No date. The Uptown Normal Circle: A Living Plaza. http://contextsensitivesolutions.org/content/case_studies/uptown_circle/resources/b4/.
Landscape Architecture Foundation. No date. Uptown Normal Circle and Streetscape. http://landscapeperformance.org/case-study-briefs/uptown-normal-circle.
Uptown Circle design.
Photo credit: HoerrSchaudt, Landscape Architects
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CASE STUDY: 14™ AVENUE NEIGHBORHOOD STREET FUND PROJECT—SEATTLE, WASHINGTON
The City of Seattle, Washington is benefiting from improvements to 14th Avenue that address
previous stormwater treatment challenges while enhancing the appearance of the avenue. The
project location has historically been susceptible to stormwater impacts due to soil with naturally
low permeability and close proximity to a non-combined sewer system. To control stormwater
impacts, 14th Avenue was redesigned at a cost of $75,000 to divert runoff through vegetated
swales that are lined with a layer of aggregate and bioretention soil to promote retention and
slow water velocity by a series of check dams. Additional water that is not retained by the
bioswales is diverted to an existing stormwater system via curb cuts. While the city did not record
water treatment improvement specific to this project, they estimate an 80 to 85 percent
improvement in non-point source pollutants, based on a similar local project (ASIA 2013).
In addition to stormwater management improvements, pedestrian safety was addressed with the
addition of a planted pedestrian island and curb bulb extensions that reduce the distance to cross
the avenue and increase visibility distance for both pedestrians and motorists. Aesthetic appeal
was enhanced with the installation of trees and public art (ASIA 2013, City of Seattle 2009).
The project was a collaborative effort among the city of Seattle, the 14th Ave Visioning project
group, and the East Ballard Community Association and was implemented by the Seattle
Department of Transportation. The $75,000 budget covered both stormwater and pedestrian
safety features. Funding was sourced from the Neighborhood Street Fund, a local levy. The green
infrastructure approaches were a cost effective alternative that the city estimates to have saved
over 10% compared to traditional design approaches (ASLA 2013).
References:
ASLA. No date. Green Infrastructure & Stormwater Management Case Study: 14th Avenue Neighborhood Street Fund Project. http://www.asla.org/uploadedFiles/CMS/
Advocacy/Federal_Government_Affairs/Stormwater_Case_Studies/Stormwater%20Case%20422%2014th%20Avenue%20Neighborhood%20Street%20Fund%20Project,
%20Seattle,%20WA.pdf.
Rain garden along Seattle's 14th Avenue.
Photo credit: Aaron and Jennifer Britton
City of Seattle. 2009. 14th Avenue S Street Improvements. http://www.seattle.gov/transportation/14ave_south_improvements.htm.
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Create Stormwater Microparks
FACT SHEET #5
Urban landscapes have many small-scale pockets of space that are underutilized and
sometimes unsightly. These spaces often are located in triangles at junctions of diagonal
streets, in spaces between buildings, in vacant lots, or in corners of parking lots. These
underused areas are often paved or have high-maintenance turf that offers limited amenity
value. They can be converted to a bioretention area or community garden with trees and
attractive vegetation, and can accomplish the following:
• Reduce impervious surface
• Infiltrate runoff from the right-of-way
and adjacent property
• Protect and restore water quality
• Improve aesthetics
• Create park-like areas
• Provide shade
• Showcase public art
• Provide wildlife habitat
• Promote urban agriculture
GREEN INFRASTRUCTURE OPPORTUNITIES
Permeable pavement
Flow-through planters
Bioswales
Trees
Soil amendments
Incorporate pavers into walkways and areas in deep shade where
vegetation might not thrive.
Use these practices, which are fully lined to prevent infiltration from
undermining building foundations or other structures, alongside
buildings to temporarily detain rooftop runoff from downspouts.
Remove pavement or gravel and create a shallow depressed area
with ornamental grasses, shrubs, and trees.
Incorporate trees into microparks for shade, stormwater and climate
change benefits, and to improve aesthetics.
Evaluate in-situ soils and amend them with organic matter or till
them as necessary to improve infiltration and plant growth.
Reduce impervious area Remove pavement at underused sites to increase stormwater infiltration. Convert vacant lots and larger sites to community gardens for the benefit of
neighborhood residents. Convert one or more street parking spaces to a micropark that serves as a seating area or gathering space.
Project Complexity
Easy
T/meframe
Less than 1 year to several years
Installation Costs
$5,000 and up, depending on site and scope
Factors Affecting Costs
• Scale of the project
• Green infrastructure practices selected
• If existing utilities require relocation or
special designs
Financing Opportunities
• Neighborhood revitalization funding
• Parks bonds
• Property tax assessments
• Stormwater utility
• Smart growth grants
Necessary Maintenance
• Hand weeding
• Debris and sediment removal
• Plant trimming and pruning
• Plant replacement
• Vacuum sweeping of permeable
pavement
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THINGS TO CONSIDER BEFOREHAND
Review local codes (setback requirements, sidewalk widths, parking requirements, etc.)
to ensure there is space for green infrastructure practices.
Identify possible conflicts with existing utilities.
Ensure that there is adequate light for plant growth, or select shade-tolerant plants for
microparks surrounded by buildings.
For microparks adjacent to streets, consider enhanced pedestrian safety measures, such
as wheelstops, railings, buffers, curb extensions, and painted crosswalks.
Consider maintenance requirements and confer with public works staff who maintain
such systems and landscapes.
Use salt-tolerant plants where salt will be used for snow and ice control.
Select native or locally adapted plants where possible to reduce maintenance and help
to ensure longevity.
POTENTIAL PROJECT PARTNERS
Business associations, neighborhood associations, garden clubs, and private sponsors can
provide funding and volunteers to help build and maintain microparks. They can also offer
input into the design and placement to maximize the benefit to the community.
FOR MORE INFORMATION
EPA Green Infrastructure Page: http://water.epa.gov/infrastructure/greeninfrastructure
American Society of Landscape Architects Green Infrastructure Page:
http://www.asla.org/greeninfrastructure.aspx and Stormwater Case Studies:
http://www.asla.org/stormwatercasestudies.aspx
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CASE STUDY: BAYSIDE PROMENADE TRAIL MICROPARK AND REDEVELOPMENT PROJECT—PORTLAND, MAINE
In association with the City of Portland, Portland Trails, the Trust for Public Lands, and the Bayside Neighborhood
Association, the 1.2-mile shared-use Bayside Promenade was constructed as a "spine" throughout the City,
allowing pedestrian and bicycle access to pocket parks, residential areas, schools, and local businesses. The trail
utilizes an abandoned railroad right-of-way and was constructed in the heart of the revitalized commercial and
residential neighborhoods in Bayside and East Bayside.
No stormwater reduction analyses were performed for the full scale project; however, the project is expected to
reduce stormwater runoff by 10% to 20% through a combination of newly installed LID practices including
bioretention, rain gardens, bioswale, porous pavers, and curb cuts. The project cost between $100,000 and
$500,000 and used public funding from federal, state, and local sources. Planning, design, construction, and long-
term maintenance of the project increased jobs and boosted the local economy.
Reference:
ASLA. No date. Green Infrastructure & Stormwater Management Case Study: Bayside Promenade Trail.
http://www.asla.org/uploadedFiles/CMS/Advocacy/Federal_Government_Affairs/Stormwater_Case_Studi
es/Stormwater%20Case%20332%20Bayside%20Promenade%20Trail,%20Portland,%20ME.pdf.
CASE STUDY: RINCON HEIGHTS MICROPARKS PROJECT—TUCSON, ARIZONA
As part of a larger neighborhood-scale retrofit project, a previously abandoned lot in the Rincon Heights
Neighborhood in Tucson, Arizona, was retrofitted into a pocket park with multiple green infrastructure practices to
capture stormwater runoff, improve water quality, and reduce flooding. The project features a 5,000 square foot
pocket park featuring curb cuts, bioretention facilities (e.g., swale, gravel-filled trenches, basins), curb extensions,
and removal of unnecessary impervious pavement onsite.
The estimated project cost was approximately $500,000 and included grant funding from the Arizona Department
of Environmental Quality; Rincon Heights Neighborhood Association, the City of Tucson Department of
Transportation, and Tucson Clean and Beautiful/Trees for Tucson were project partners. The project now
showcases an innovative sustainable design in a previously underutilized residential area in Tucson. The green
infrastructure practices aim to slow traffic and increase onsite infiltration providing aesthetic, safety, and
stormwater benefits.
Reference:
Watershed Management Group. 2014. Demonstration Sites, http://watershedmg.org/demo-sites/tucson.
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