The handbook of Technical irrigaTion informaTion - Hunter Industries

Amount of Rise in 100'of RunHandbook of Technical Irrigation InformationSlope ComparisonPercent Slope Slope Ratio Slope Angle Degrees Plan to Slope Factor*5 5 20:1 2° 52' 1.00110 10 10:1 5° 43' 1.00514 14 7° 58' 1.01015 15 8° 32' 1.01117 17 9° 39' 1.01420 20 5:1 11° 19' 1.02025 25 4:1 14° 2' 1.03130 30 16° 42' 1.04433 33 3:1 18° 16' 1.05335 35 19° 17' 1.05940 40 2.5:1 21° 48' 1.07745 45 24° 14' 1.09750 50 2:1 26° 34' 1.11855 55 28° 49' 1.14160 60 30° 58' 1.16665 65 1.5:1 33° 1' 1.19370 70 35° 0' 1.22175 75 36° 52' 1.25080 80 38° 40' 1.28185 85 40° 22' 1.31290 90 41° 59' 1.34595 95 43° 32' 1.379100 100 1:1 45° 0' 1.414105 105 46° 24' 1.450110 110 47° 44' 1.487115 115 48° 59' 1.524120 120 50° 12' 1.562125 125 0.8:1 51° 20' 1.601130 130 52° 26' 1.640135 135 53° 28' 1.680140 140 54° 28' 1.720145 145 55° 24' 1.761150 150 0.67:1 56° 19' 1.803* Plan to Slope Factor: to convert from a plan dimension (horizontal measure) to actual slope distance, multiply by this factor. For example: plan indicatesa 2:1 (50%) slope measuring 100 feet from the top to the toe of the slope on the plan. The actual distance from the top to the toe of the slope is100 feet x 1.118 = 111.8 feet.Plan to Slope Factor: to convert from an actual soil measurement, divide by this factor. For example: soil measurement is 12 feet, and the slope ratio is1.5:1, the actual distance on the plan will be 12 ÷ 1.193 = 10 feet.46