Tupelo
Greenville
Vicksburg
Jackson
Gulfport
Legend: This map highlights regional
patterns of dependence on intermittent,
ephemeral, and headwater streams for
surface drinking water in Mississippi. In
Mississippi, 347 total miles of streams
provide water for surface water intakes
supplying public drinking water systems;
of this, 210 miles, or 61%, are
intermittent, ephemeral, or headwater
streams. Over 110,000 people in
Mssissippi 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 4th Quarter 2006 Data.
U25zj
Percentage of Surface Drinking Water from Intermittent,
Ephemeral, and Headwater Streams in Mississippi
Key:
Intermittent, ephemeral, and
headwater stream miles as
percentage of total stream
miles contained in all SPAs
for a given county
57% - 65%
No Data
Meridian
120
5 Miles

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