The Rippl (mass curve) method for reservoir storage design finds the required storage as:
Choose the correct answer
The total annual inflow
The maximum positive difference between the cumulative demand line and the cumulative inflow mass curve (the maximum deficiency gap)
The average monthly inflow
The sum of all monthly shortfalls
Correct Answer
B. The maximum positive difference between the cumulative demand line and the cumulative inflow mass curve (the maximum deficiency gap)
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Rippl method: plot cumulative inflow and cumulative demand on same time axis. Where demand exceeds inflow, a deficit appears. Required storage = maximum ordinate difference between demand and inflow curves (tangent-to-mass-curve method). The reservoir must provide this storage to meet demand in drought periods.
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