NAME
GW Engineering EXAM I FALL 2010
PROBLEM #1 -25
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USE UNITS of METERS SECONDS and GRAMS
Prepare a water budget for the year 2009 for the unconfined sedimentary aquifer that
constitutes the basin illustrated below. The basin is surrounded by a topographic divide that
coincides with the water table divide. Delineate each item of the water budget and show your
calculations on the following page.
The unconfined aquifer has a Transmissivity
ol
120m2tday and a Specific Yield of 0.12
The climate is such that evapotranspiration is about 90% of precipitation.
The basin is residential with approximately 5000 homes obtaining water from domestic wells.
Precipitation Stations
Annual Precipitation
for 2009
was the same as the
average annual
precipitation for the past
century
830 mm
A
620 mm
B
Water Level in meters
Measured at the precipitation stations
Contoured Water Levels are July 1, 2009
Location
c Lhr
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Jan 1,2009
Dec 31, 2009
850.8 m
849.3 m
800.3 m
798.8 m
751.1 m
749.6 m
100
Stream Gage X
2009
Average Ann ual^Discharge
26 meters"/sec
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Delineate each item of the budget, show your calculations for each, and present the budget.
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