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 3 of 4.

Amrutha Raveendran said:   8 years ago
But @Rosh.

Here the water depth is asked for 80% efficiency so 20cm is enough. Don't it is?

Shreya doshi said:   8 years ago
Thank you @Rosh.

Jeff said:   8 years ago
@Anil.

What if efficiency is 80% and conveyance losses is 12%?

Anil said:   8 years ago
Thank you all.

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

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

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

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)

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

So 16*80% = 10.4.

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

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

X = 25.


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