The 'trap efficiency' of a reservoir is defined as the percentage of:
Choose the correct answer
Water stored relative to total inflow
Incoming sediment that settles in the reservoir (not passed downstream) — function of capacity-inflow ratio
Efficiency of turbines in the dam
Spillway discharge efficiency
Correct Answer
B. Incoming sediment that settles in the reservoir (not passed downstream) — function of capacity-inflow ratio
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Trap efficiency (TE): percentage of incoming sediment that is trapped in the reservoir = (sediment deposited)/(total incoming sediment) × 100%. Depends on: capacity-inflow ratio (C/I). High C/I → long detention time → high TE → reservoir silts up faster. Brune curve plots TE vs C/I. As reservoir silts up, C/I decreases, TE decreases.
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