Question

The evaporation losses from a reservoir of constant surface area of 500 acres are 150 acre-ft per day. Of the outflow from the reservoir is 50 cfs, determine the change in the water level of the reservoir in a day without inflow.

Answer 1

Answer:

0.498 ft/day

Explanation:

given,

Surface area, A = 500 acres

evaporation loss, E = 150 acre-ft/day

out flow from reservoir = 50 cfs

   = 50 x 60 x 60 x 24

   = 4.32 x 10⁶ ft³/day

   = 4.32 x 10⁶ ft².ft/day

   =$\dfrac{4.32\times 10^6}{43560}\ Acre.ft/day$

   = 99.17 acre-ft/day

total moment of the water= evaporation loss + outflow

                                     = 150 + 99.17

                                     = 249.17 acre-ft/day

change in water level per day

      = $\dfrac{249.17}{500}$

      = 0.498 ft/day

There is loss of 0.498 ft water per day.