Water Quality Analysis
Simulation Program (WASP):

The Water Quality Analysis Simulation Pro-
gram—(WASP6), an enhancement of the
original WASP (Di Toro et al., 1983; Con-
nolly and Winfield, 1984; Ambrose, R.B. et
al., 1988). This model helps users interpret
and predict water quality responses to natural
phenomena and man-made pollution for vari-
ous pollution management decisions. WASP6
is a dynamic compartment-modeling program
for aquatic systems, including both the water
column and the underlying benthos. WASP
allows the user to investigate 1, 2, and 3 di-
mensional systems, and a variety of pollutant
types. The state variables for the given modules
are given in the table below. The time-varying
processes of advection, dispersion, point and
diffuse mass loading and boundary exchange
are represented in the model. WASP also can
be linked with hydrodynamic and sediment
transport models that can provide flows,
depths velocities, temperature, salinity and
sediment fluxes.

WASP has been used to examine eutrophication of Tampa Bay,
FL; phosphorus loading to Lake Okeechobee, FL; eutrophica-
tion of the Neuse River Estuary, NC; eutrophication Coosa

Eutrophication Module

Organic Chemical
Module

Mercury Module

Dissolved Oxygen

Chemical 1

Elemental
Mercury

CBOD (1)

Chemical 2

Divalent
Mercury

CBOD (2)

Chemical 3

Methyl Mercury

CBOD (3)

Solids 1

Sands

Ammonia

Solids 2

Fines

Nitrate

Solids 3



Organic Nitrogen





Orthophosphate





Organic Phosphorous





Algae





Benthic Algae





Detritus





Sediment Diagenesis





Salinity





River and Reservoirs, AL; PCB pollution of the Great Lakes,
eutrophication of the Potomac Estuary, kepone pollution of the
James River Estuary, volatile organic pollution of the Delaware
Estuary, and heavy metal pollution of the Deep River, North
Carolina, mercury in the Savannah River, GA.

WASP Preprocessor

The data preprocessor allows for the rapid development of
input datasets. The ability to bring data into the model is
as simple as cut and paste or queried from a database. The
preprocessor provides detailed descriptions of all model pa-
rameters and kinetic constants. When linking WASP with
hydrodynamic models it is as simple as pointing to the hydro-
dynamic linkage file.

•	Import time series from WRDB, Spreadsheet, Text Files

•	Automatically import hydrodynamic model interface
information

•	Multi-session capable

•	Run time diagnosis

United States
I"	Environmental Protection

kl M ^Agency


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WASP Case
Study for
Little River

Post Processor

The Post-Processor (MOVEM) provides an efficient method
for reviewing model predictions and comparing them with field
data for calibration. MOVEM has the ability to display re sults
from all of the WASP models as well as others, MOVEM allows
the modeler to displays the results in two graphical formats:

an-*—	|Kn-*w«g*	4	MMM

1)	Spatial Grid—a two dimensional rendition of the model
network is displayed in a window where the model network
is color shaded based upon the predicted concentration.

2)	x/y Plots-—generates an x/y line plot of predicted and/or
observed model results in a window.

There is no limit on the number of x/y plots, spatial grids
or even model result files the user can utilize in a session.
Separate windows are created for each spatial grid or x/y plot
created by the user.

a Jiaiaiai s&i »

,

GAEPD Lake Station



Flow Input Cells



Hydrodynamic Grid

¦

Lake Allatoona



Subbasins



03150104 NHD

Embayment,

GA

WASP 6.1 was setup
and calibrated for
the Little River em-
bayment on Lake
Allatoona, Georgia to
support the develop-
ment of a nutrient
TMDL for the State
of Georgia. WASP
was applied for three
consecutive growing seasons during 2000, 2001, and 2002 to
simulate phytoplankton growth due to excess nutrients from
point and nonpoint sources. The Little River drains 214 square
miles of primarily residential and agricultural land into Lake
Allatoona, which is located on the Etowah River approxi-
mately 30 miles north of Atlanta, Georgia. The LSPC model
was developed to simulate the watershed flows and nutrient
constituents to input in the EFDC and WASP models. EFDC
was used to simulate the hydrodynamics in the embayment
and developed a hydrodynamic linkage file for WASP The
calibrated WASP model was used by the State to develop
management strategies to ensure water quality standards are
achieved.

Visit the

Watershed & Water Quality Modeling
Technical Support Center Website
http://www.epa.gov/athens/wwqtsc/index.html

Pr^lt United States

Environmental Protection
kl	Agency


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