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TABLE 6 <br />Stormwater Drainage System Development Charge Analysis <br />1. Analysis of Stormwater Drainage System Value <br />Total Replacement Cost -Pipe $72,259,689 <br />Total Replacement Cost -Open Channel Systems $20,303,830 <br />Total Replacement Cost -Other Stormwater Components $23,647,185 <br />Total Replacement Cost of Stormwater System $11fi,210,704 <br />2. Analysis of Assessable Cost <br />Assessable portion of piped system $47,227,719 <br />Assessable portion of open channels $0 <br />Assessable portion of other system components $18,346,066 <br />Totat'Assessab[e -Cast $65;573,785 <br />3. Stormwater System Calculation Details <br />Single_Family Dwelling (SFD) average lot size in city limits 9,200 sq. ft. <br />Residential Runoff Coefficient 35 percent <br />Average Manufactured Home Park space size (double wide) 1,684 sq. ft. <br />Total Developed Acres inside City Limits 12,653 Acres <br />Total Number of Acres of Impervious Surface 7,868 Acres <br />4. Calculation of SDC <br />hlon~Assessabie Cost $50,636',919 <br />Cost per Acre [ $50,636,919/ 7,868 ] $6,435.81 <br />Cost per Square Foot [ $6,435.81 / 43,560 J $0.148 <br />Cost per SFD flat rate [ 9,200 x 0.35 x $0.148 = $476.00 rounded ] $475.74 <br />Cost per Duplex flat rate [rate for SFD x 2 = $951.00 rounded ] $951.48 <br />Cost per SFD = or > 3,000 building footprint [ $475.74 x 1.5 ] $713.61 <br />Cost per Manufactured Home Park Space [ 1,684 x $0.148 ] $249.23 <br />May 1, 1997 City of Eugene SDC Methodology.. Page E-3 <br />