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INFILTRATION AND WATER QUALITY CALCULATION <br />As per the Soil Survey of the Snohomish County Area, the project development area is <br />covered with Alderwood soil, which corresponds to Type "C" soil. <br />*Rainfall <br />100- Year = 3.25 in. <br />Infiltration and water quality trench sizing for rain Barden 1 <br />Building Lot = 2,200 SF <br />Driveway = 2,000 SF <br />Total area included in the analysis = 4,200 SF = 0.10 Acres <br />Infiltration rate = 1 in/hr <br />Tc = 6 minutes <br />Start of live storage: 579.0000 ft <br />Event Match Q (cfs) Peak Q (cfs)! Peak Stg (ft)' Vol c Vol acft i Time to Em t <br />t— <� __ P Y! <br />6� onth�` 0.0000 0�0074—� 579.1568 147.04 I 0.0011 27.83 � L— __ <br />100 year _ 0.0000 �j 0.0124 j 5799252 366.45 00084 36.17 <br />Running R:\\Jobs\\08-0475 4th Ave SP\\Stormshed\\Levelpool 1 Report pgm on <br />Thursdav, October 01, 2009 <br />Summary Report of all Detention Pond Data <br />Event iLPrecip <br />6-month; 0.9 000 <br />2 year ! 1.5500 <br />'110 year !12.2500 <br />100 year; 3.2500 <br />BASLIST2 <br />[Developed 11 Using [TYPElA] As [6-month] <br />[Developed 1] Using [TYPElA] As [100 year] <br />LSTEND <br />BASLIST [TYPElA] AS [6-month] DETAILED <br />[Developed 1] <br />LSTEND <br />;n Method <br />Into <br />SBUH _111tainfall <br />10.00 min Pe� akin. <br />Factor <br />TYPElA <br />484.00 <br />