Denis LeBlanc

U.S. Geological SurveyNorthborough, MA

The Hydrology of Cape Cod Streams

Considerations for the Coonamesset River

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CoonamessettRiver

Water-Table Map from Ground-Water

Flow Model

Water-table contours in feet

Contributing Area to the

Coonamessett River

River Discharge9.0 Mgal/day

Contributing Area7.3 mi2

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CoonamessettRiver

Contributing Areas

Water-table contours in feet

http://waterdata.usgs.gov/nwis

Ground-Water Level

Streamflow

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DISTANCE FROM POND OUTLET, IN FEET

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5/24/89

7/5/894/11/89

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chvi

lle R

oad

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dwic

h R

oad

Outlet of Last Bog

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Nov-88 Jan-89 Mar-89 Apr-89 Jun-89 Aug-89 Sep-89 Nov-89

MIL

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R D

AY Outlet of Last Bog

Sandwich Road

Outlet of Pond

Coonamessett River

Summary

• Ground water is main source of flow in Coonamessett River

• Recharge area extends onto MMR

• Flow varies directly with ground-water levels

The Ground-Water Recharge Mosaic

Water Budget

In:

Natural recharge 180 Mgal/d

Onsite systems 7 Mgal/d

Out:

Wells 10 Mgal/d

Streams 62 Mgal/d

Coast 101 Mgal/d