SBUH Calculation Worksheet for City of Eugene Storm EventsProject Name: Braewood######Designer: ALBBasin: Swale 2User-Supplied DataPervious AreaImpervious AreaPervious Area, SF27,05827,058 Pervious Area, Acres0.620.62Pervious Area Curve Number, CNperv7698Time of Concentration, Tc, minutes5Note: minimum Tc is five minutesCity of Eugene 24-Hour Rainfall Depths (NRCS Type 1A distribution)Recurrence IntervalWQ2-Yr5-Yr10-Yr25-Yr50-Yr100-YrInches1.56 3.12 3.6 4.46 5.18 6 6.48 <br />Calculated DataTotal Project Area, Acres1.24Total Project Area, Square Feet54,116Recurrence IntervalWQ2-Yr5-Yr10-Yr25-Yr50-Yr100-YrPeak Flow Rate, Qpeak, cfs0.240.640.781.051.281.541.70Total Runoff Volume, V, cubic feet3,4958,98410,83314,25517,19920,61422,637Time to Peak Runoff, hours7.837.837.837.837.837.837.83Runoff HydrographImpervious Area, SFImpervious Area, AcresImpervious Area Curve Number, CNimp0.000.200.400.600.801.001.201.401.601.800 500 1000 1500 2000 2500Runoff, cfsTime, minutesWQ2-Year5-Year10-Year25-Year50-Year100-Year 800 Willamette Street, Suite 400 Eugene, OR 97401 541.684.4902 kpff.com