Toledo
Cleveland
Columbus
Dayton
Cincinnati
Legend: This map highlights regional
patterns of dependence on
intermittent, ephemeral, and
headwater streams for surface
drinking water in Ohio. In Ohio,
11,605 total miles of streams provide
water for surface water intakes
supplying public drinking water
systems; of this, 6,978 miles, or 60%,
are intermittent, ephemeral, or
headwater streams. Over 5.2 million
people in Ohio receive drinking water
from public drinking water systems
that rely at least in part on
intermittent, ephemeral, or headwater
streams. This analysis compared the
stream length of intermittent,
ephemeral, and headwater streams to
total stream length within all mapped
Source Protection Areas (SPAs) for
each county. A SPA is an area
upstream from a drinking water
source or intake that contributes
surface water flow to the drinking
water intake during a 24-hour period.
This is based on data that generally
do not include streams less than one
mile in length. Intermittent streams
are streams containing water for only
part of the year. Ephemeral streams
flow in response to precipitation
events. First-order streams have been
used to represent headwater streams.
Data Sources: National
Hydrography Dataset Plus at medium
resolution; Federal Safe Drinking
Water Information System 4thQuarter
2006 Data.
Percentage of Surface Drinking Water from Intermittent,
Ephemeral, and Headwater Streams in Ohio
Key:
Intermittent, ephemeral, and headwater
stream miles as percentage of total
stream miles contained in all SPAs
for a given county
0%
0.11% - 44%
45% - 56%
56% - 69%
70% - 86%
87% - 100%
~ No Data
^FAkron>

-------