The 'mass curve' (Rippl diagram) in hydrology is used to determine:
Choose the correct answer
Flood peak discharge only
Required reservoir storage capacity to meet a given demand — maximum gap between demand line and supply mass curve
Canal seepage losses
Sediment yield from catchment
Correct Answer
B. Required reservoir storage capacity to meet a given demand — maximum gap between demand line and supply mass curve
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Mass curve (Rippl, 1882): cumulative flow (m³) vs time. Demand line (slope = mean demand rate) superimposed. Maximum positive difference between demand and supply lines = required reservoir capacity (critical drawdown). Used for: sizing storage reservoirs for yield analysis. Sequent peak algorithm is a more systematic version. Both find capacity to meet demand over a critical period.
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