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Surface Ir. Eval.
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SURFACE IRRIGATION EVALUATION GUIDE

Flow Rate:

Cubic Feet per Second (CFS)

CFS = 450 gal./min

CFS = ac.-in./hr.

%

Irrigation Efficiency

75% = 2.7"

55% = 3.6"

35% = 5.7"

 

Acres Irrigated
   

1

5

10

15

20
   

Approximate Hours Required to Apply a 2" Irrigation at the given % Irrigation Efficiencies

1

75

2.7

13

27

40

53
 

55

3.6

18

36

55

73
 

35

5.7

29

57

86

114

2.5

75

1.1

5

11

16

21
 

55

1.5

7

15

22

29
 

35

2.3

11

23

34

46

5

75

0.5

3

5

8

11
 

55

0.7

4

7

11

15
 

35

1.1

6

11

17

23

7.5

75

0.4

2

4

5

7
 

55

0.5

2.4

5

7

10
 

35

0.8

4

8

11

15

10

75

0.3

1.3

3

4

5
 

55

0.4

2

4

6

7
 

35

0.6

3

6

9

11

12.5

75

0.2

1.1

2

3

4
 

55

0.3

1.5

3

4.4

6
 

35

0.5

2.3

5

7

9

15

75

0.2

1

2

3

4
 

55

0.24

1.2

2.4

4

5
 

35

0.4

2

4

6

8

Enter "YOUR" Field Values:

Hours =

Inches (     ) X Acres (     )

CFS (     )

Example Calculation:

Hours =

Inches (3.5) X Acres (12)

            CFS (8 )

Answer: 5.3 hours needed to apply 3.5"on 12 acres with 8 cfs

Technical Questions about HIT may possibly be quickly answered by contacting:
Rudy Garcia
Natural Resources Conservation Service
Soil Conservationist & Water Quality Specialist
e-mail: rgarcia@nm.nrcs.usda.gov
or call: 1-505-522-8775, extension 116

 

Note: Technical Questions may possibly be quickly answered by contacting USDA, Natural Resources Conservation Service Soil Conservationists:

Holistic Irrigation Technology (HIT) Rudy Garcia, Soil Conservationist (Water Quality),  rgarcia@nm.nrcs.usda.gov or call: (505) 522-8775, ext. 116

Remote Sensing & GIS Technology Dave Christenson, Soil Conservationist (Remote Sensing), dchriste@nm.nrcs.usda.gov or call: (505) 522-8775, ext. 115

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Copyright © 1999 Regional Precision Farming Pilot Project
Last modified: April 28, 2000