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SEEPAGE TRENCHES <br /> <br /> Total Gravel L - Minimum standard Disposal Trench Length <br /> Gravel Depth per 150 Gallons of Daily Sewage Flow. <br /> Depth Req ' d <br /> Req'd. Below Length of Seepage Trench Required per 150 <br /> Pipe gallons of daily sew. age flow. , .... <br /> <br />12!~ .. ": 6" 50~ 75~ 100~ 125~ 150~ 175~ <br />13 7 48 72 96 120 144 168 <br />14 8 46 69 92 115 138 162 <br />15 9 45 67 89 111 133 156 <br />16 10 43 64 86 107 129 150 <br />17 11 42 62 83 104 124 145 <br />18 12 40 60 80 100 120 140 <br />19 13 39 58 78 97 116 136 <br />20 14 38 56 75 94 113 131 <br />21 15 37 55 73 91 109 127 <br />22 16 36 53 71 88 106 124 <br />23 17 35 52 69 86 103 120 <br />24 18 34 50 67 83 100 117 <br />25 19 33 49 65 81 98 114 <br />26 20 32 48 63 79 95 111 <br />27 21 31 46 62 77 93 108 <br />28 22 30 45 60 75 90 105 <br /> <br />29 ...... 23 29 44 59 73 88 103 <br />30 24 29 43 57 72 86 100 <br /> <br /> ~ula used: Seepage Trench Length = 4 X L <br /> ! (3+2D) <br />(in ~he formula, D is expressed in feet) <br />(factors rounded to next highest value) <br />The projected daily sewage flow shall be limited to a maximum of <br />four hundred fity (450) gallons. <br /> <br /> <br />