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HomeMy WebLinkAbout17 Sanitary Sewer Flow Estimates C � H Engineering end Surveying Inc. 1091 Swneridge Drive•Bozeman.MT 59718 Phone(4061 587-1115•Fox(4061 587-97BB www.chengineere.com•info Ochengineem.cum University Crossing Site Plan - Lot 1A, Minor Subdivision No. 503A Sanitary Sewer Flow Calculations Average daily flow calculation Residential Number of Units= 59 dwelling units Contributing Area= 1.90 acres Avg. Population Density= 2.17 *persons/dwelling unit Avg. Daily Flow Rate= 64.4 *gal/person/day Assumed Infiltration Rate= 150 *gal/acre/day Total Population= 128.03 persons Infiltration= 285.3 gal/day Peaking Factor= 4.21 (Harmon Formula) Peak Flow Rate= 34997 gal/day(Peak flow+ Infiltration) 24.30 gpm Total Peak Flow= 0.0541 cfs *Values from Bozeman Wasterwater Collection Facilities Plan Update-June 2015 Harmon Formula-. Peaking Factor=(19 +PO-5).,(4+PD. ) -%here:P=Population�n thousands