6. Runoff from a 200 mile² catchment drains into a reservoir than has an average surface area of 4000 acres. The reservoir is to be used for municipal water supply. Annual rainfall over the watershed is 40 inches and the annual runoff is 2 inches. Evaporation from the reservoir averages 40 inches per year. If the surface area of the reservoir is roughly constant with depth, how much will the reservoir depth change in one year?

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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6. Runoff from a 200 mile² catchment drains into a reservoir than has
an average surface area of 4000 acres. The reservoir is to be used
for municipal water supply. Annual rainfall over the watershed is 40
inches and the annual runoff is 2 inches. Evaporation from the reservoir
averages 40 inches per year. If the surface area of the reservoir is
roughly constant with depth, how much will the reservoir depth change
in one year?
Transcribed Image Text:6. Runoff from a 200 mile² catchment drains into a reservoir than has an average surface area of 4000 acres. The reservoir is to be used for municipal water supply. Annual rainfall over the watershed is 40 inches and the annual runoff is 2 inches. Evaporation from the reservoir averages 40 inches per year. If the surface area of the reservoir is roughly constant with depth, how much will the reservoir depth change in one year?
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