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UNI V nH51Tr or �iivnnch'in <br />Trench n Worksheet <br />SYSTEM SIZING: <br />A. Design Flow: 600 GPD B. Maximum Depth: 24 inches <br />C. Loading Rate: 0.60 ft2/GPD <br />D. Required Bottom Area: Design Flow (1.A) + Loading Rate (1. C) = Required Bottom Area <br />600 - 0.60 = 1000 ft2 <br />E. Select Dispersal Media: ❑ Rock ❑ Chambers ❑ Graveness Pipe <br />❑ Other Approved Media [rockor geo covered chambers <br />F. Select Distribution Method: ❑ Pressure (required for rapidly permeable soils) <br />G. Select Dispersal Type <br />2. TRENCH CONFIGURATION: <br />A. <br />❑ Gravity -Drop Box <br />❑ Gravity -Other gravity - drop box <br />❑ Trench ❑ Bed (<6% Slope) <br />Vequi red trench <br />bottom area (ftZ): <br />from 4A <br />Sidewall <br />Absorption <br />inches <br />Bottom Area <br />Reduction <br />Bottom Area <br />Multiplier <br />Reduced <br />trench <br />bottom area <br />6 to 11 <br />0% <br />1 <br />1000 <br />12 to 17 <br />20% <br />0.8 <br />800 <br />1000 <br />18 to 23 <br />34% <br />0.66 <br />660 <br />24 <br />40% <br />0.6 <br />600 <br />B. Select Sidewall Height: 12 inches = 1 1.00 Ift <br />C. Required Bottom Area: 800 —]ft2 <br />D. Select Trench Width: 3.0 ft <br />Width <br />E. Total Required Trench Length: Bottom Area (2.C)+ Trench Width (2.D) = Total Required Trench Length <br />800.0:1 ft2 _ 3.0 = 266.7 ft <br />F. Select Trench Spacing :' 8 ft (typically 5 - 12 ft) <br />G. Calculate Lawn Area: Trench Length (2.E) X Trench Spacing (2.F) = ft2 lawn area <br />266.7 X 8.0 = 2133.3 ft2 lawn area <br />�r <br />ibution <br />-wall <br />H.. If using rock or subsitutue, select Depth Required to Cover Distribution Pipe: <br />0.5 ft (0.33 for pressure, 0.5 for gravity) <br />I. Calculate Rock Volume: (Sidewall Height (2.6) + Depth to Cover Pipe (2.H)) X Bottom Area (2.C) = cubic feet <br />+ 0.50 ) X 800.0 - 1200 ft3 <br />Divide ft3 by 27 ft3 /yd 3 to calculate cubic yards: <br />1200 ft - 27 = 1 44 yd3 <br />