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e <br />i'ao-c: 3 Roof lkuno� zrsit-aauor� �ysrerri 6iztna <br />Trench Dimensions <br />Required Length of Trench per 100 square feet of Roof Surface"* <br />%a-idth depth` <br />coarse sand sand loa.nay sand sandy loam loam <br />1 5 rr. <br />1 0-ft.. <br />0.72 <br />1.44 <br />3.38 <br />5,48 <br />7.88 <br />1.5 ft. <br />0.56 <br />1.10 <br />2.514 <br />4.08 <br />5.80° <br />2.0 ft. <br />0.45 <br />0.89 <br />2.06 <br />3.30 <br />4.60 <br />2.5 ft. <br />0.38 <br />0.75 <br />132 <br />2.76 <br />3.84 <br />3.0 ft. <br />0.32 <br />0.65 <br />1.49 <br />2.38 <br />3.28 <br />1 -Q ft, <br />1.0 ft. <br />0.60 <br />1.19 <br />2.68 <br />4.34 <br />6.22 <br />1.5 ft. <br />0.47 <br />9-9z�.__ <br />2.04 <br />3.28 <br />4.62 <br />oF <br />2.0 ft. <br />0.39 <br />�0.76__� <br />1.66 <br />2.66 <br />3.70 <br />2.5 ft.- <br />0.33 <br />0.65 <br />1.41 <br />2.26 <br />3.10 <br />3.0 ft. <br />0.28 <br />0.56 <br />1.23 <br />1.94 <br />2.68 <br />2.5 ft. <br />1.0 ft. <br />0.51 <br />1.01 <br />2.24 <br />3.64 <br />5.14 <br />1.5 ft. <br />0.41 <br />0.79 <br />1.71 <br />2.76 <br />3.88 <br />2.0 ft. <br />0.34 <br />0.66 <br />1.40 <br />2.26 <br />3.14 <br />2.5 ft. <br />0.29 <br />0.56 <br />1.20 <br />1.90 <br />2.66 <br />3.0 ft. <br />0.25 <br />0.49 <br />1.05 <br />1.65 <br />2.30 <br />3.0 ft. <br />1.0 ft. <br />0.44 <br />0.88 <br />1.92 <br />3.10 <br />4.40 <br />.1.5 ft, <br />0.36 <br />0.69 <br />1.47 <br />2.38 <br />3.36 <br />2.0 ft. <br />0.30 <br />0.58 <br />1.21 <br />1.94 <br />2.74 <br />2.5 ft. <br />0.25 <br />0.50 <br />1.04 <br />1.65 <br />2.32 <br />&.0. A- <br />0.22 <br />0.44 <br />0.91 <br />I M <br />2.00 <br />3.5 ft. <br />1.0 ft. <br />0.39 <br />0.78 <br />1.68 <br />2.72 <br />3.88 <br />1.5 fur <br />0.32 <br />0.62 <br />1.29 <br />2.09 <br />2.96 <br />2.0 ft. <br />0.26 <br />0.51 <br />1.07 <br />1.70 <br />2.42 <br />2.5 ft. <br />0.23 <br />0.44 <br />0.92 <br />1.45 <br />2.06 <br />3.0 ft. <br />0.20 <br />0.39 <br />0.81 <br />1.27 <br />1.79 <br />4.0 ft <br />1.0 ft. <br />0.35 <br />0.70 <br />1.49 <br />2.42 <br />3.46 <br />1.5 ft. <br />0.28 <br />0.55 <br />1.15 <br />1.85 <br />2.66 <br />2.0 ft. <br />0.24 <br />0.46 <br />0.95 <br />1.52_ <br />2.18 <br />2.5 ft. <br />0.20 <br />0.40 <br />0.82 <br />1.30 <br />1.86 <br />3.0 ft. <br />0.18 <br />0.35 <br />0.73 <br />1.13 <br />1.62 <br />-IJeptn rerers to the aeptn or wasnea root, not aepm rrom surtace <br />**Soil textures to be detentz ned using the results of soil gradation tests and the USDA Textural Triangle. <br />Example: An infiltration trench 3.5 feet wide and 2 feet deep, dug in sandy loam soils, for runoff from <br />a 1500 square foot roof; would be 25.5 feet long (chart value of 1.70 multiplied by 15). <br />3-2-10 <br />