atchment has the following annual averages calculated from 17 years of data: Pre

Question

atchment has the following annual averages calculated from 17 years of data: Precipitation: 84 cm River discharge: 28 cm Overland flow: 6 cm Baseflow: 22 cm No streams flow into the catchment. No fl water directly leaves the catchment by groundwater w (.e, all groundwater flows into a stream before leaving into the catchment). You can assume the catchment is at steady state. (A) What is the annual evapotranspiration (in cm) for the watershed? (4 pts) (B) Wha t is the annual groundwater recharge (in cm) for the watershed (2 pts) (C) What is the annual runoff from the basin expressed as an average rate in units of cubic feet per second? (3 pts)

Explanation / Answer

Answer:a

Evapotranspiration can be calculated by following formula;

E= Precipitation- (Overland flow + river discharge)

E= 84-(34) =50cm

Answer:b

Groundwater recharge = Precipitation- (river discharge + evapotranspiration)

Groundwater recharge = 84- (28+50)= 6cm

Answer:c

Annual runoff from basin = 750*28= 21000 = 21000/30= 700 ft3/s

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