Denis LeBlanc
U.S. Geological SurveyNorthborough, MA
The Hydrology of Cape Cod Streams
Considerations for the Coonamesset River
40
30
20
10
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
40
50
60
30
20
10
CoonamessettRiver
Contributing Areas
Water-table contours in feet
http://waterdata.usgs.gov/nwis
Ground-Water Level
Streamflow
0
2
4
6
8
0 4000 8000 12000 16000
DISTANCE FROM POND OUTLET, IN FEET
MIL
LIO
N G
AL
LO
NS
PE
R D
AY
5/24/89
7/5/894/11/89
Hat
chvi
lle R
oad
San
dwic
h R
oad
Outlet of Last Bog
0
2
4
6
8
Nov-88 Jan-89 Mar-89 Apr-89 Jun-89 Aug-89 Sep-89 Nov-89
MIL
LIO
N G
AL
LO
NS
PE
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
