Question

Average yield of a storage reservoir is the arithmetic average of its ________________

(a) firm yields over a long period

(b) secondary yields over a long period

(c) firm and secondary yields over a long period

(d) reservoir yield over a long period

I have been asked this question in an online quiz.

I need to ask this question from Reservoir Capacity Determination Using Hydrograph and Mass-curve in chapter Reservoirs and Dam Reservoirs Planning of Irrigation Engineering

Answer 1

Right option is (c) firm and secondary yields over a long period

For explanation I would say: Firm yield is the yield corresponding to the most critical year on record. Secondary yield is the water available in excess of the firm yield during years of higher inflows. Average yield is the average of both firm yield and secondary yield.