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
Discussion:
33 comments Page 1 of 4.
Shrikant said:
4 years ago
For 80% conveyance efficiency, depth=16cm (means here 20% loss as given in Qs.)
For 100% Conveyance efficiency Depth would be = ((16/80)*100) = 20cm.
Now for 80% irrigation efficiency( as given in QS.) and for 100% conveyance efficiency(as we have calculated above) is =20cm.
=> for 100% irrigation efficiency and 100% conveyance efficiency the required depth will be= ((20/80)*100) = 25cm.
For 100% Conveyance efficiency Depth would be = ((16/80)*100) = 20cm.
Now for 80% irrigation efficiency( as given in QS.) and for 100% conveyance efficiency(as we have calculated above) is =20cm.
=> for 100% irrigation efficiency and 100% conveyance efficiency the required depth will be= ((20/80)*100) = 25cm.
(2)
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.
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)
Shabbir Ahmad said:
3 years ago
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.
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.
(5)
Amit said:
5 years ago
Overall efficiency (water application efficiency*conveyance efficiency) = {water actually stored to the root zone/water delivered to the field}.
Therefore,
0.8 * 0.8 = 16/x.
So, x = 25cm..
Therefore,
0.8 * 0.8 = 16/x.
So, x = 25cm..
Bishow said:
4 years ago
Let depth at canal be x then 20% loss = x - 20% of x = 0.8x,
From 0.8x only 80% taken by soil that equals 16cm in depth,
So,
80% of 0.8X = 16, Solve x=25.
From 0.8x only 80% taken by soil that equals 16cm in depth,
So,
80% of 0.8X = 16, Solve x=25.
(6)
INDRANIL KARFA said:
8 years ago
Depth of water after losses =x -x/5=4x/5.
Again Depth of water after losses=16*(100÷80)=20cm.
So, 4x/5=20, x=25 cm.
Again Depth of water after losses=16*(100÷80)=20cm.
So, 4x/5=20, x=25 cm.
Farhan said:
2 weeks ago
ir efi = 80% = 0.8.
con efi = 100 - 20 = 0.8,
Overall E = 0.8 * 0.8 = 0.64,
D at outlet = 16/0.64 = 25cm.
con efi = 100 - 20 = 0.8,
Overall E = 0.8 * 0.8 = 0.64,
D at outlet = 16/0.64 = 25cm.
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.
Remain = 20 efficiency = 80%.
So .20*.80 = 16.
Answer is 25 c.m.
Zemenu said:
10 years ago
Crop water requirement ETo = Gross irrigation requirement*Irrigation efficiency.
So 16*80% = 10.4.
So 16*80% = 10.4.
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?
Here the water depth is asked for 80% efficiency so 20cm is enough. Don't it is?
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