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To%al Gravel L = Minimum standa.rd Disposal Trench Length <br /> Gravel Depth per 150 Gallons of Daily Sewage Flow. <br /> Reil'd, Below Length of Seepage Trench Required per <br /> Pipe gallons of daily sewage flow, <br /> <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 lO 43 64 86 107 129 150 <br /> 17 11 49_ 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 68 106 124 <br /> 23 17 35 ~2 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 /> 2'7 , ,,, 21 31 46 62 77 93 108 <br /> 28 22 30 45 60 75 90 105 <br /> 29 23 29, 44 59 73 88 103 <br /> 30 24 29 43 57 72 86 100 <br />Formula used: Seepage Trench' Lenq~h _- ~ x n -- <br /> <br /> (3+~D) <br /> (in,~he formula, O 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) gallon~. <br /> <br /> <br />