9509 19TH AVE SE 2018-01-02 MF Import

Everett LDS Parking Lot Expansion Storm Drainage Report Total 1.4100 ac Supporting Data: Pervious CN Data: Lawn 86.00 0.6500 ac Offsite - Lawn 86.00 0.3800 ac Impervious CN Data: Offsite - Impervious (Est. @ 50%) 98.00 0.3800 ac Pervious TC Data: Flow type: Description: Length: Slope: Coeff: Travel Time Sheet Tct: Short prairie grass and lawns 300.00 it 2.00% 0.1500 33.90 min Shallow Tc2: Short grass, pasture and lawns 230.00 ft 2.70% 11.0000 2.12 min Impervious TC Data: Flow type: Description: Length: Slope: Coeff: Travel Time Fixed assumed 0.00 fit 0.00% 5.0000 5.00 min Control Structure ID: RISER - Multiple Orifice Structure Descrip: Multiple Orifice Start El Max El Increment 100.0000 It 105.0000 ft 0.10 Orif Coeff: 0.62 Bottom El: 98.00 ft Lowest Diam: 1.6200 in out to 2nd: 1.6900 It Diam: 3.6200 in Node ID: PIPE Desc Manhole structure Start El: 99.0000 It Max El: 103,5000 ft Contrib Basin: Contrib Hyd: Length Diam Slope UpNode DnNode Num 140.0000 It 4.5000 It 0.00010 1 Node ID: LEVEL POOL Desc Manhole structure Start El: 100.0000 It Max El: 105.0000 It Contrib Basin: Contrib Hyd: Storage Id: PIPE Discharge Id: RISER RLPCOMPUTE [LEVEL POOL] SUMMARY 2 yr Match Q: 0.0886 cis Peak Out Q: 0,0917 cfs - Peak Stg: 101.67 It - Active Vol: 1006.59 cf - Pipe length: 140.00 It 10 yr Match Q: 0.3240 cis Peak Out Q: 0.3247 cfs - Peak Stg: 102.08 It - Active Vol: 1255.35 cf - Pipe length: 140.00 It 100 yr Match Q: 0.5562 cfs Peak Out Q: 0.5303 cfs - Peak Stg: 103.00 it - Active Vol: 1722.71 cf - Pipe length: 140.00 It Detention Volume Required = 1,723 cf x 1.35 C.P. - 2,326 LJ' - -� Detention Volume Provided = 2,407cf Pre -Treatment Volume Provided = 537cf P52008,00113 EvmeO LDS Paik,ng LOrQ¢.o.Smun Reoom,00113 D,m nape Repot Re.ns d 01.10.�8.do. y Pt L Page 19 of 36 OP