Question

In general practice adopted for capacity computations is to actually survey the site contours only at vertical distances of __________________

(a) 5 m or more

(b) Less than 5 m

(c) 0.5 m or more

(d) Less than 0.5 m

I had been asked this question in exam.

This question is from Capacity and Area Elevation Curves of a Reservoir Site in portion Reservoirs and Dam Reservoirs Planning of Irrigation Engineering

Answer 1

Correct option is (a) 5 m or more

Easy explanation: The area of the intervening contours at smaller intervals of 0.5 m or so and at vertical distances of 5 m or so. It is then interpolated by taking the square root of the surveyed contours. It is also assumed that the square root of the interpolated ones varies in exact proportion to their vertical distances.