Question

How many cubic metres of water will be removed for this particular period of a system designed to use a D.C of 1.5 cm draining 20 hectares for a capacity of 5 days?

(a) 10000 m^3

(b) 25000 m^3

(c) 15000 m^3

(d) 20000 m^3

The question was posed to me during a job interview.

Question is from Water Logged Reclamation topic in chapter Water Logged Reclamation and Saline Soils for Agricultural Purposes of Irrigation Engineering

Answer 1

The correct choice is (c) 15000 m^3

The best explanation: D.C of 1.5 cm means that 1.5 cm of water depth will be removed from the drainage in 24 hours.

Volume of water entering the drain per day = (1.5/100) x 20 x 10^4 = 3000 m^3/day

Volume of water passing the drain within 5 days of flow = 5 x 3000 = 15000 m^3.