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4320 THOMSON AVE 2023-08-10
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4320 THOMSON AVE 2023-08-10
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8/10/2023 2:09:30 PM
Creation date
7/27/2023 3:56:26 PM
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Address Document
Street Name
THOMSON AVE
Street Number
4320
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(Rational Method - Developed Conditions <br />for: Thomson Residence <br />Q = C."giA <br />Tc = 6.00 (assumed, since all pipe flow) <br />Dense Forest <br />Light Forest <br />Pasture <br />Lawns <br />Gravel <br />Pavement & Roofs <br />Open Water <br />Other <br />Area (ac) C <br />1 1 <br />1 1 <br />1 1•� <br />1'1 <br />11 <br />1 11 <br />Total Area (A) = 0.09 acres <br />Ca,14 0.90 <br />i = (Pr)(ir) Pr total precipitation at the project site for 24-hr duration storm <br />it-- unit peak rainfall intensity factor <br />ir= (ar)(Tc)^(-br) at, bt= coefficients from Table 3.2. LB of KCSWDM <br />(ir)2= 0.56 i2= 0.782451 Q2= 0.07 <br />(ir)lo= 0.78 ilo= 1.70528 Qlo= 0.14 <br />(ir)25= 0.83 i25= 2.158026 Q2.1= 0.18 <br />(ir)100=1 0,84 iioo= 1 2.6167781 Qtoo= 0.22 <br />`= � Rational Method 1ly BJL Date 2/22/2021 <br />Chkd Date <br />ENGINEERING Developed Conditions <br />250 4th Ave. South Scale N.T.S. Sheet No. <br />Suite 200 Job No. <br />Edmonds, WA 98020 Thomson Residence 21026 <br />
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