Irrigation efficiency

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Irrigation Efficiency

Water conveyance Efficiency
It takes into account, conveyance or transit losses such as seepage through canal and evaporation through it.

η_c=W_f/W_r ×100

Where, Wf = water delivered to the field
Wr = water delivered from river or stream

Water Application Efficiency
It is the ratio of water stored in root zone to the water delivered to the field.

η_a=W_s/W_f ×100

Where, WS = water weight stored in root zone
WS = Wf – deep percolation – runoff
Wf = water delivered to the field

This efficiency is also called as farm efficiency and it depends on the irrigation technique that has been adopted.

Water use efficiency
It is the ratio of water used beneficially or consumptively to the water delivered to the field.

η_u=W_u/W_f ×100
Where, Wf = water delivered to the field
WU = consumptively used water

Water Storage Efficiency
This is the ratio of actual water stored in the root zone to the water needed to be stored to bring the moisture content upto field capacity.

Water Distribution efficiency
This evaluate the degree to which water is uniformly distributed to the root zone throughout the field area.

η_d=(1-y/d)×100

Where, d = average depth
y = Average numerical deviation in the depth of water stored from the average depth stored during irrigation
Question – the depths of penetration along the length of a border strip at points 30 m apart were proved. There observed values are 2 m, 1.9 m, 1.8 m, 1.6 m and 1.5 m. Compute the water distribution efficiency.

Solution –
Water distribution efficiency,
η_d=(1-y/d)×100
Where, d = average depth

d = (2+1.9+1.8+1.6+1.5)/5=1.76

And y = average numerical deviation

y = 1/5((2-1.76)+(1.9-1.76)+(1.8-1.76)+(1.76-1.6)+(1.76-1.5)=0.168


Therefore,
η_d=(1-0.168/1.76)×100

η_d=90.45%

Consumptive Use Efficiency
It is the ratio of water used consumptively to the net amount of water from the root zone.

1. IRRIGATION Irrigation Efficiency

2. IRRIGATION Water conveyance Efficiency It takes into account, conveyance or transit losses such as seepage through canal and evaporation through it.     Where, W f = water delivered to the field W r = water delivered from river or stream  

3. IRRIGATION 2. Water Application Efficiency It is the ratio of water stored in root zone to the water delivered to the field.     Where, W S = water weight stored in root zone W S = W f – deep percolation – runoff W f = water delivered to the field   This efficiency is also called as farm efficiency and it depends on the irrigation technique that has been adopted.  

4. IRRIGATION 3. Water use efficiency It is the ratio of water used beneficially or consumptively to the water delivered to the field.   Where, W f = water delivered to the field W U = consumptively used water    

5. IRRIGATION 4. Water Storage Efficiency This is the ratio of actual water stored in the root zone to the water needed to be stored to bring the moisture content upto field capacity.

6. IRRIGATION 5. Water Distribution efficiency This evaluate the degree to which water is uniformly distributed to the root zone throughout the field area.     Where, d = average depth y = Average numerical deviation in the depth of water stored from the average depth stored during irrigation  

7. IRRIGATION Question – the depths of penetration along the length of a border strip at points 30 m apart were proved. There observed values are 2 m, 1.9 m, 1.8 m, 1.6 m and 1.5 m. Compute the water distribution efficiency.   Solution – Water distribution efficiency, Where, d = average depth d = And y = average numerical deviation y = Therefore,    

8. IRRIGATION 6. Consumptive Use Efficiency It is the ratio of water used consumptively to the net amount of water from the root zone.

9. IRRIGATION THANKS FOR MORE CIVIL ENGINEERING RELATED ARTICLES VISIT www.civilengineeringadda.com