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Irrigation - Engineering

Q1:

If the irrigation efficiency is 80%, conveyance losses are 20% and the actual depth of watering is 16 cm, the depth of water required at the canal outlet, is

A 10 cm

B 15 cm

C 20 cm

D 25 cm

E 30 cm

ANS:D - 25 cm

The answer here is 20 cm because the depth required at the outlet is asked which is 16/(1-0.2) = 20 cm.

Mistake:
Depth of water at the inlet=20/0.8 = 25 cm.

We might mark an answer as 25 cm but as it is asked at the canal outlet, so 25 cm is not the answer.