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HomeMy WebLinkAboutBuilding Miscellaneous 2014-6-27 Pfeiffer FD PROF Page 1 of 2 E� F 5rR2o, U Engineering , LLC v w„GI bee J a b .L 12997 .r 606 Summit Blvd. '� Springfield,OR 97477 a 7 OREGON Pb.: (541)747-4656 V g Fx.: (541)747-1183 2 4- �<Y 26. \ e ,4Q p. Soakage Trench Engineering Pl5 *ere/ s. 124 SVI 4- Date : 06/27/14 Job Description : 40' x 80' Building w/36' x 24' Addit. Job No. : 598 Brothers Carpet Cleaners Revised: 582 Shelley St. Springfield, OR 97477 Drainage Area Tributary Areas Al A2 A3 Area Width (W) 40.00 24.00 0.00 Ft. Area Length (L) 80.00 36.00 0.00 Ft. Drainage Area 3200.00 864.00 0.00 Ft2 Total Area : 4064 Ft2 No. Soakage Trenches: 1 Tributary Area per Trench ( A) : 4064 Ft2 Flow Rate to Soakage Trench Q= (S.F.)(C )( I )(A ) Factor of Safety ( S.F.) : 1.50 Run-Off Coefficient ( C) : 0.85 Precipitation Rate(s) Normal Precipitation Rate(II ) : 0.025 In/Hr (Source: N.O.A.A., OTAK) 5-Year Storm Precipitation Rate ( 12 ) : 2.750 In/Hr Storm Duration (t) : 5 Min. Runoff to Detainment: QI =((60-t)/60)(S.F.)( C )( I, )(A )/720 = 0.1649 Ft3/min Q2 = (t/60)(S.F.)(C )(12 )( A)/720 = 1.6492 Ft3/min Accumulative Water Volume (1 Hr. Basis) VI =Q1(60-t)= 9.071 Ft3 V2=Q2(t)= 8.246 Ft3 VT= VI + V2 = 17.317 Ft3 Trench Working Cross Section Dimensions Soakage Trench Working Depth (D), (36” min.) D = 3.00 Ft. Soakage Trench Working Width (W), (30" min.) W= 2.50 Ft. Soakage Trench Required Working Volume(Minimum) Page 2 of 2 Porosity Ratio of Fill Rock Only Yes (n1 =0.476) or 1.00 0.476 Sand+Rock No (n2=(0.476+0.236(D-1)) /D) or 1.00 1.000 Required Physical Working Volume VR= VT/(n1)(n2) = 36.380 Ft3 Soakage Trench Percolation Area (Minimum) Percolation Rate (Ref.: NRCS Soil Survey or Field Test) NRCS Soil Survey Data Yes QPi = 0.60 In/Hr Field Percolation Test Data No QP2= 0.00 In/Hr QPA= (QP1 +QP2)/12 = 0.050 Ft3/Hr/Ft2 Minimum Percolation Area (10 Hr Drawdown) Minimum Required Percolation Area: ARP=VT/QPA= 34.63 Ft2 Soakage Trench Trial Dimensions Effective Working Cross Section Area: AE= (D)(W)(0.476)= 3.57 Ft2 Minimum Trench Length: LM;,,=ARP/W= 13.85 Ft. Soakage Trench Finish Length (>=12 Ft): L = 21.00 Ft. Actual Percolation Area of Soakage Trench AP= ( W )(L ) =I 52.50 Sq.Ft.>=Arp, O.K. Percolation Service Factor: 3.03 I Geometric Effective Volume of Soakage Trench VA =( AE )(L) =I 74.97 Cu.Ft. >=Vt, O.K: Volumetric Service Factor: 2.06 I Soakage Trench Drawdown Time: T=VT/(QPA)(AP) =I 6.6 FHr<= 10,.O.K: Final Excavated Size of Soakage Trench(es) Width: 2.50 Ft. Depth: 4.00 Ft. Length: 21.00 Ft. DEPTH '0' (4•0'MINIMLM) - ::\ 1:11 \\.\�:\\\.'e'/77::. �. . /C.H' '1 1\\\\\\\\N\\\\\\\•\/\/� \ N� �,o�T �, 1\\\\\\\\\\\\\\\\ \// // d� r r \\\\\\\\\\\\\\\\'\ \/\Q/ �K���AA \\\\\\ nTITA M AA T1 9 0 r £ In W Cl• 0 z 0 O •- '-1• . A x -1 0 -1 ••••y MIN. MIN. r 4 I GI 0 m 0 3 0 r Z 33 �R -PJ £ -I m - m _ m I n ^m x rim m F: 10• 4 O O 01 3 \/\\%\\j\\j\\%\j \� \\j\\j�\% III.MIN. 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