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DESIGN CALCULATIONS <br />WEST LANE MOBILE HOME PARK <br />DESIGN STANDARDS <br />Average Daily Flow: (Q) 18,000 gpd <br />Peak Daily Flow: 1.5Q = 27,000 gpd <br />Peak Pumped Hourly Flow to Equal. Zone: 4.OQ = 72,000 gpd= 3,000 gph <br />Peak Hourly flow from Equal. Zone: 1.5Q = 27,000 gpd= 1,125 gph <br />CALCULATIONS <br />1) Aeration Zone <br />(a) Detention based on 24 hours @ average daily flow =18,000alp lons <br />(b) Volume based on 15#BODS/1000 cu.ft. <br />(8.34)(230ppm)(0.018) = 34.5#BOD5 <br />(34.5 /15)(1000)(7.481) = 17,206 gallons . <br />Design at minimum of 18,000 gallons aeration zone. <br />Actual volume =18,060 gallons <br />2) Clarifier Zone <br />(a) Detention based on 4 hours @ average daily flow <br />(18,000/24)(4) = 3,000alglons <br />(b) Area based on surface settling rate of 1,000 gpd/sq.ft. @ Peak Daily Flow <br />(27,000/1000) = 27 sq.ft. <br />(c) Weir length based on overflow rate of 20,000 gpd/ft @ Peak Hourly Flow <br />(27,000/20,000) =1.4 feet. / <br />Design at minimum of 3,000 gallons, 27 sq.ft. of surface area and 1.4 lin.ft. of weir <br />length. <br />Actual volume = 3,395 gallons <br />Actual area = 72 square feet <br />Actual weir length = 6 feet <br />l2 <br />