Question

A flow duration curve is a curve plotted between ________________

(a) Accumulated flow v/s time

(b) Discharge v/s time

(c) (Cumulative Inflow – Cumulative Outflow) v/s time

(d) Streamflow v/s Percent of time the flow is equaled or exceeded

This question was addressed to me at a job interview.

The question is from Reservoir Capacity Determination Using Hydrograph and Mass-curve in portion Reservoirs and Dam Reservoirs Planning of Irrigation Engineering

Answer 1

Right choice is (d) Streamflow v/s Percent of time the flow is equaled or exceeded

The best I can explain: A flow-duration curve is a curve plotted between the streamflow and the percent of the time the flow is equaled or exceeded. It is also called a discharge-frequency curve and it represents the cumulative frequency distribution.