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TECHNICAL INFORMATION<br />
SLOPE EQUIVALENTS/IRRIGATION<br />
PERCENT, ANGLE, RATIO<br />
% Angle Ratio<br />
0<br />
0˚<br />
10 5˚ 43' 10: 1<br />
20 11˚ 19' 5: 1<br />
30 16˚ 42'<br />
33 18˚ 16' 3: 1<br />
40 21˚ 48'<br />
50 26˚ 34' 2: 1<br />
60 30˚ 58'<br />
67 33˚ 50' 1.5: 1<br />
70 35˚ 0'<br />
80 38˚ 40'<br />
90 42˚ 0'<br />
100 45˚ 0' 1: 1<br />
0.5: 1 63˚ 27'<br />
62˚ 15'<br />
60˚ 57'<br />
59˚ 32'<br />
58˚ 0'<br />
56˚ 19'<br />
54˚ 28'<br />
52˚ 26'<br />
50˚ 42'<br />
47˚ 44'<br />
TECHNICAL<br />
200<br />
190<br />
180<br />
170<br />
160<br />
150<br />
140<br />
130<br />
120<br />
110<br />
SLOPE IRRIGATION: Maximum precipitation rates for slopes<br />
Soil Texture 0 to 5% Slope 5 to 8% Slope 8 to 12% Slope 12% + Slope<br />
Cover Bare Cover Bare Cover Bare Cover Bare<br />
Coarse sandy soils 2.0 2.0 2.0 1.5 1.5 1.0 1.0 0.5<br />
Coarse sandy soils over compact subsoils 1.75 1.5 1.25 1.0 1.0 0.75 0.75 0.4<br />
Light sandy loams uniform 1.75 1.0 1.25 0.8 1.0 0.6 0.75 0.4<br />
Light sandy loams over compact subsoils 1.25 0.75 1.0 0.5 0.75 0.4 0.5 0.3<br />
Uniform silt loams 1.0 0.5 0.8 0.4 0.6 0.3 0.4 0.2<br />
Silt loams over compact subsoil 0.6 0.3 0.5 0.25 0.4 0.15 0.3 0.1<br />
Heavy clay or clay loam 0.2 0.15 0.15 0.10 0.12 0.08 0.1 0.06<br />
Notes:<br />
Maximum precipitation rates for slopes:<br />
The maximum precipitation values listed below are those suggested by the United States Department of Agriculture. The values are<br />
average and may vary with respect to actual soil condition and condition of ground cover.<br />
151
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