HomeMy WebLinkAboutSanitary Sewer Calculations-10-15-2019 00 m Mountain Vista Site Plan 180334
Sewer Calculations
Engineering and surveying Inc. 10/10/2019
#of Dwelling Units (DUs) 25 DU
#of people per dwelling 2.11 persons/DU**
population 53 people
peaking factor* 4.30
assumed infiltration rate** 150 gallons/acre/day
lot area 2.4346 acres
infiltration rate 365 gpd
wastewater generation rate* 89 gal/day/person
Average Wastewater Flow Rate 4 gpm
Average Wastewater Flow Rate 211 gallons per hour
Peak Wastewater Flow Rate 14 gpm
Peak Wastewater Flow Rate 856 gallons per hour
*Calculated Per Harmon Formula
**Based on City of Bozeman Design Standards and Specifications Policy
Harmon Formula: Peaking Factor=(18 +PO.5)/(4+PD.�)
where:P=Population�n thousands
ATTHEW •.°
HAUSAUER
s ; No. 3838,2P ;War