Technical Data Precipitation Rate
Precipitation Rate Calculation in Millimeters/Hour
Slope, Angle and Ratio Precipitation Rates
The precipitation rate depends upon the operating pressure at the sprinkler, the sprinkler spacing and
the spacing pattern. For example, to calculate the precipitation rate in mm/hour of a full circle S700
sprinkler with a 6.0 nozzle, operating pressure of 3,5 Bar, spaced at 15 meters in a square pattern, the
precipitation rate calculation would be:
%
Angle
Ratio
Slope Factor
0
0°
23,9 LPM x 60 min. = 6,37mm/hr
15m x 15m
10
5° 43'
11° 19'
10:1
5:1
1
20
Maximum Precipitation Rates(Metric)
Maximum Precipitation Rates: Millimeters Per Hour
30
33
16° 42'
18° 16'
3:1
1.054
0 to 5% slope
5 to 8% slope
8 to 12% slope
Cover
12% + slope
Cover Bare
Soil Texture
Cover
Bare
Cover
Bare
Bare
40
50
21° 48'
26° 34'
Coarse sandy soils
50,8
50,8
50,8
38,1
38,1
25,4
25,4
12,7
2:1
1.12
1.20
Coarse sandy soils over compact subsoils
Light sandy loams uniform
44,5
44,5
31,8
25,4
15,2
5,1
38,1
25,4
19,8
12,7
7,6
31,8
31,8
25,4
20,3
12,7
3,8
25,4
20,3
12,7
10,2
6,4
25,4
25,4
19,1
15,2
10,2
3,0
19,1
15,2
10,2
7,6
19,1
19,1
12,7
10,2
7,6
10,2
10,2
7,6
60
30° 58'
33° 50'
Light sandy loams over compact subsoils
Uniform silt loams
67
70
1.5:1
35°
0'
5,1
Silt loams over compact subsoil
Heavy clay or clay loam
3,8
2,5
80
38° 40'
3,8
2,5
2,0
2,5
1,5
90
42° 0'
45° 0'
The maximum PR values listed above are as suggested by the United States Department of Agriculture.
The values are average and may vary with respect to actual soil condition and condition of ground cover.
100
1:1
1.41
Precipitation Rate Calculation in Inches/Hour
To find the precipitation in inches per hour using a S700 full circle sprinkler with a 6.0 nozzle, operating
pressure of 50 PSI, spaced at 49 feet in a square pattern, the precipitation rate calculation would be:
~
~~~~~ ~ ~ ~ ~
6.28 GPM x 96.3 = 0.25”/hr
49’ x 49’
Maximum Precipitation Rates(English)
Maximum Precipitation Rates: Inches Per Hour
0 to 5% slope
5 to 8% slope
8 to 12% slope
12% + slope
Cover Bare
Soil Texture
Cover
Bare
Cover
Bare
Cover
Bare
Coarse sandy soils
2.00
2.00
2.00
1.50
1.50
1.00
1.00
0.50
Coarse sandy soils over compact subsoils
Light sandy loams uniform
1.75
1.75
1.25
1.00
0.60
0.20
1.50
1.00
0.75
0.50
0.30
0.15
1.25
1.25
1.00
0.80
0.50
0.15
1.00
0.80
0.50
0.40
0.25
0.10
1.00
1.00
0.75
0.60
0.40
0.12
0.75
0.60
0.40
0.30
0.15
0.08
0.75
0.75
0.50
0.40
0.30
0.10
0.40
0.40
0.30
0.20
0.10
0.06
Light sandy loams over compact subsoils
Uniform silt loams
Silt loams over compact subsoil
Heavy clay or clay loam
The maximum PR values listed above are as suggested by the United States Department of Agriculture.
The values are average and may vary with respect to actual soil condition and condition of ground cover.
89
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