Hydrology quesrion!! For a water supply reservoir, the following data on precipi
ID: 1710570 • Letter: H
Question
Hydrology quesrion!!
For a water supply reservoir, the following data on precipitation (rainfall) P, evaporation E, and runoff Q are given in m^3 for the months January to December. Assume the initial storage at the beginning of January as 250 m^3. (i) Calculate the change in storage (in m^3) for each month. (ii) At the end of which month is the amount of water stored in the reservoir largest and when is the smallest amount of water present in the storage? (iii) What is the difference (in m^3) in the amount of water stored in the reservoir between these two extremes? (ANSWERS: (Largest storage is 516 m^3 at the end of April and the smallest is 235 m^3 at the end of July: The difference is 281 m^3))Explanation / Answer
i) Change in storage for each month = P-E-Q
january - 254-5-150 = 99m3
february - 209-25-110 = 74m3
march - 169-30-80 = 59m3
april - 89-50-5 = 34m3
may - 49-80 = -31m3
june - 0-100 = -100m3
july - 0-150 = -150m3
august - 74-70 = 4m3
september - 104-60 = 44m3
october - 94-20-10 = 64m3
november - 109-10-15 = 84m3
december - 194-5-120 = 69m3
ii)maximum storage will be add the end of April = 250+99+74+59+34 = 516m3
smallest amount of storage is at the end of July = 516-31-100-150 = 235m3
iii)difference between two extremes = 516-235 = 281m3
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