FOR USE IN THE CONSTRUCTION OF SUB-SURFACE IRRIGATION SYSTEMS IN THE HEAVIER LOAMS (NOT CLAY OR HARDPAN) Dimensions given are for inside measurements. ══════╤═══════╤═══════╤═══════╤═══════╤═══════╤════════╤════════╤════════ Number│ Total │No. of │ Mean │ Mean │ Depth │Diameter│ Dis- │Distance of │Length │ Sect- │ Width │Length │ of │ of │charging│ from Per- │ of │ions in│ of │ of │Siphon │ Siphon │Depth or│Roof to sons │3–inch │ Sub- │Siphon │Siphon │Chamber│ (Inch- │Maximum │ Top of Served│ Sub- │surface│Chamber│Chamber│ from │ es). │Depth of│ Wall by │surface│System.│(Feet).│(Feet).│Roof of│ │Effluent│between Sewer.│Tiling.│ │ │ │ Tank │ │ above │Settling │ │ │ │ │(Feet).│ │ Lower │Tank and │ │ │ │ │ │ │Edge of │ Siphon │ │ │ │ │ │ │ Siphon │Chamber │ │ │ │ │ │ │ Bell │ (Inch- │ │ │ │ │ │ │ (Inch- │ es). │ │ │ │ │ │ │ es). │ ──────┼───────┼───────┼───────┼───────┼───────┼────────┼────────┼──────── 4│ 300│ 2│ 2´ 5˝ │ 3´ │ 2´ 4˝│ 3˝│ 13˝│ 12˝ 8│ 600│ 2│ 3´ │ 5´ │ 2´ 4˝│ 3˝│ 13˝│ 12˝ 12│ 900│ 2│ 4´ │ 5´ │ 2´ 4˝│ 3˝│ 13˝│ 12˝ 15│ 1125│ 2│ 4´ │ 6´ 6˝ │ 2´ 4˝│ 3˝│ 13˝│ 12˝ 25│ 1875│ 2│ 4´ │ 6´ │ 3´ 2˝│ 5˝│ 23˝│ 12˝ 35│ 2625│ 2│ 4´ │ 4´ 6˝ │ 3´ 2˝│ 5˝│ 23˝│ 16˝ 50│ 3750│ 2│ 4´ 6˝ │ 6´ │ 3´ 2˝│ 5˝│ 23˝│ 16˝ 75│ 5625│ 2│ 6´ │ 7´ │ 3´ 2˝│ 5˝│ 23˝│ 16˝ 100│ 7500│ 2│ 7´ │ 8´ │ 3´ 2˝│ 5˝│ 23˝│ 16˝ 125│ 9375│ 3│ 8´ │10´ │ 3´ 9˝│ 6˝│ 30˝│ 20˝ 150│ 11250│ 3│ 9´ │12´ │ 3´ 9˝│ 6˝│ 30˝│ 20˝ 175│ 13125│ 3│10´ │12´ │ 4´ 2˝│ 8˝│ 35˝│ 20˝ 200│ 15000│ 3│11´ │12´ │ 4´ 2˝│ 8˝│ 35˝│ 20˝ ──────┴───────┴───────┴───────┴───────┴───────┴────────┴────────┴────────
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