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Civil Software Design -- SEDCAD+ Version 3.1 Copyright (C) 1987-1992. Pamela J. Schwab. All rights reserved. • Company Name: Greystone Development Consultants Filename: C:\SCAD\DT\TCC\EMDVENT4 User: CW BEGEJ Date: 12-04-1995 Time: 23:16:55 SMALL AREA EXEMPTION DEMONSTRATION FOR THE EMD VENTILATION SHAFT SITE Storm: 1.80 inches, 10 year-24 hour, SCS Type II Hydrograph Convolution Interval: 0.1 hr NON-POND STRUCTURE INPUT/OUTPUT TABLE ----------------------------------------- ----------------------------------------- J1, B1, S4 FILL SLOPES BELO PAD Drainage Area from J1, B1, S4, SWS(s)1: 0.2 acres Total Contributing Drainage Area: 2.3 acres GRASS FILTER INPUTS: Bulk Specific Gravity: 2.65 Initial Depth of Sediment in Zone D: 0.00 inches Manning's Grass Grass Infiltration Stiffness Seg n Height Spacing Rate Factor # (in) (in) (iph) (N-sq m) 1 0.0117 9.0 3.0 0.05 20.000 ------ Filter ------ Length Width Slope (ft) (ft) (%) 10.0 580.0 8.0 • Total Filter Peak Critical Filter Sediment Trap Infiltration Infiltration Flow Prone Travel Wedge Depth Efficiency Volume Rate Depth Velocity Time Location in Zone C (%) ------------ -- - (ac-ft) ----------- (cfs) ------------- -- - (inch) ------- - (fps) (hrs) ------------------ - - - - (feet) --------- - - - (inch) --------- -------- ----- -- -- 87.9 ----------- 0.0074 -------- -- 0.0067 ------ 0.047 ------ --- --- -- 1.0367 0.1000 -- --- - 0.134 - 0.0450 Runoff Peak Pea k Sediment Peak Settleab le Volume Discharge Sediment Con centration Concentratio n 24VW 24AA (ac-ft) - - (cfs) (tons) (mg/1) ml/1 (ml/1) - (ml/1) - - IN 0.15 - -- - 1.96 - -- 6.7 - 61227 --- -- 38.02 21.13 4.36 OUT 0.15 1.95 0.8 11403 0.05 0.02 0.00 ***~~**,t****+r*****,r***************************~*******~***********************~ •