Percentage of Surface Drinking Water from Intermittent,
Ephemeral, or Headwater Streams in Rhode Island
Woonsocket
Pawtucket
I
Providence
Cranston
Warwick
Key:
Intermittent, ephemeral, and
headwater stream miles as
percentage of total stream
miles contained in all SPAs
for a given county
Newport
60% - 64%
75%
No Data
Kingston

PRO"^
0
2
4
12
16

Legend: This map highlights regional patterns of dependence on intermittent, ephemeral, and headwater streams for surface drinking
water in New Hampshire. In New Hampshire, 2,341 total miles of streams provide water for surface water intakes supplying public
drinking water systems; of this, 1,311 miles, or 56%, are intermittent, ephemeral, or headwater streams. Over 500,000 people in New
Hampshire 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 lengdi 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 lengdi. 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

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