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1.SYSTEM SIZING: <br />A.Design Flow:GPD <br />B.Code Maximum Depth:inches inches <br />C.Soil Loading Rate:GPD/ft2 Contour Loading Rate:gal/ft <br />D. <br />GPD ÷ ft2 <br />E.Select Dispersal Media: <br />(selection required) <br />F.Select Distribution Method: <br />G.If distribution media is installed in contact with sandy or loamy sand or with a percolation rate of 0.1 to 5 mpi <br />indicate distribution or treatment method: <br />2.TRENCH CONFIGURATION: ROCK <br />A. <br />B.Select Sidewall Height:inches =ft <br />C.Design Bottom Area (2.A):ft2 <br />D.Select Trench Width:ft <br />E. <br />ft2 ÷ ft =ft <br />I.Calculate Minimum system length based on Contour Loading Rate: Design Flow ÷ Contour Loading Rate = <br />gpd ÷ ft <br />F.Select No. of Trenches:trenches <br />G.Select Trench Spacing :ft (typically 5 - 12 ft from center to center) <br />H.Calculate Lawn Area: Trench Length (2.E) X Trench Spacing (2.G) = square feet of lawn area <br />ft X ft =ft2 lawn area <br />J.Select Depth Required to Cover Distribution Pipe: <br />ft (0.33 ft for pressure, 0.5 ft for gravity) <br />K.Calculate Rock Volume: (Sidewall Height (2.B) + Depth to Cover Pipe (2.J)) X Bottom Area (2.C) = cubic feet <br />( ft +ft ) X ft2 =ft3 <br />Divide ft3 by 27 ft3/yd3 to calculate cubic yards: <br />ft3 ÷ 27 =yd3 <br />40%0.6 <br />225 <br />0.66 <br />Bottom Area <br />Multiplier <br />12 to 17 <br />v 07.14.15 <br />24.0 <br />12.0 <br /> <br />24 <br />500 <br />34% <br />Sidewall <br />Absorption <br />(inches) <br />20% <br />18 to 23 <br />0.45 <br />Project ID: <br />1 <br />225 <br />Bottom Area <br />Reduction <br />Designers Maximum Depth: <br />0.45 <br />Required Bottom Area: Design Flow (1.A) ÷ Loading Rate (1.C) = Initial Required Bottom Area <br />6 to 11 <br />Design <br />trench <br />bottom area <br /> GPD/ft2 = <br />Initial required <br />trench bottom area <br />(ft2): (from 1.D) <br />500 <br />500 <br />OSTP Trench Design <br />Worksheet <br />0.8 <br />Total Designed Trench Length: Bottom Area ÷ Trench Width = Total Required Trench Length <br /> <br />24 <br />gal/ft =