Civil Engineering - Irrigation - Discussion

Discussion Forum : Irrigation - Section 2 (Q.No. 10)
10.
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
10 cm
15 cm
20 cm
25 cm
30 cm
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
33 comments Page 1 of 4.

GSHAH said:   1 decade ago
Taking 25 as a flow, loss = 25*.20 = 5.
Remain = 20 efficiency = 80%.

So .20*.80 = 16.
Answer is 25 c.m.

Priyanka suryavanshi said:   1 decade ago
Not understood. Can you elaborate?

Rana faheem said:   1 decade ago
Is there any relation or formula for it?

RAHUL said:   1 decade ago
Hence, after losses = X-X/5 = 4X/5.

= 4X/5*80/100 = 16.

X = 25.

Zemenu said:   10 years ago
Crop water requirement ETo = Gross irrigation requirement*Irrigation efficiency.

So 16*80% = 10.4.

Rosh said:   10 years ago
Depth of water required considering conveyance losses = 16/0.8 = 20 cm (20% is lost in conveyance means only 80% in reached. So we have to provide more depth of water).

Irrigation efficiency is 80% (means if I provide 20 cm depth of water then only 80% land will get irrigated).

To make 100 % irrigation, Depth of water from canal outlet = 20/0.8 = 25 cm.

I hope its clear.
(1)

Sharyu said:   9 years ago
Yes, Thanks @Rosh.

RAJAT said:   8 years ago
Yes, now clearly understood thank you @Rosh.

Tanu said:   8 years ago
Thank you so much @Rosh.

Anil said:   8 years ago
Thank you all.


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