Question

What is the unit of runoff ________

(a) Day-sec meter

(b) M^2/s

(c) MM/S^2

(d) Ns/m^2

I got this question by my college director while I was bunking the class.

Question is from Hydrology topic in section Hydro Electric Power Plant of Energy Engineering

Answer 1

Right option is (a) Day-sec meter

Explanation: The unit of runoff is m^3/s or Day-second meter.

1 Day second meter = Discharge collected in catchment area at the rate of 1 m^3/s or for one day           => 1 x 24 x 3600 = 86400 M^3/s

And Total run off is given by:

  Total Run-off = Direct runoff over the land surface + Run-off through seepage.