4. A mean draft of 100mgd is produced from a drainage area of 200mi². At the flow line the reservoir is estimated to cover about 4,000 acres. The annual rainfall is 37in., The mean annual runoff is 10in, and the mean annual lake evaporation is 30in. Find the net gain or lost a storage. Compute the volume of water evaporated. Hoe significant is this amount.
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