Question

With the reduction in reservoir capacity over the passage of time, the trap efficiency ___________

(a) increases

(b) decreases

(c) remains unaffected

(d) may increase or decrease depending upon the reservoir characteristics

I had been asked this question in semester exam.

The origin of the question is Reservoir Capacity Determination Using Hydrograph and Mass-curve topic in chapter Reservoirs and Dam Reservoirs Planning of Irrigation Engineering

Answer 1

Correct option is (b) decreases

To explain: If the reservoir capacity reduces with constant inflow value, the trap efficiency reduces. Hence, for small reservoirs having small capacity on large rivers having large inflow rates, the trap efficiency is extremely low.