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<br />Comprehensive Sanitary Sewer Plan <br />City of Arden Hills, MN <br />WSB Project No. 3455-20 Page 10 <br />SANITARY SEWER DESIGN CRITERIA <br />Land Use <br />The City’s existing and 2040 land use maps were used in the development of this plan. Detailed <br />information and figures regarding Arden Hills’ land use is included in the City’s 2040 <br />Comprehensive Land Use Plan. Using existing land use, metering data, and future land use <br />information, current and future flows were calculated and divided by service area as described <br />below. <br />Estimated Average Flows – Existing <br />To estimate the flows in trunk mains throughout the City, metering data was obtained from the <br />Metropolitan Council. Flows were assigned proportionally to each service district based on the <br />acreage of residential, mixed use, commercial/industrial/office, and institutional land within each <br />area and typical flows per acre for each particular land use. <br />Estimated Average Flows – 2040 Build Out <br />Once average flows were estimated, future flows were projected based on the planned 2040 <br />land use from the Land Use Plan. Parcels that are planned to be developed were assigned <br />wastewater flow rates in accordance to their land use type. Table 6 lists the assigned flows, <br />which include design considerations for inflow and infiltration (I/I). Refer to the Inflow and <br />Infiltration section of this report for more information about I/I as it relates to Arden Hills’ sanitary <br />sewer system. <br />Table 6. Assumed Wastewater Generation by Land Use Type <br />Land Use Average Flow <br />(gpd/acre) <br />Low Density Residential 720 <br />Neighborhood Residential 900 <br />Medium Density Residential 1,350 <br />High Density Residential 1,890 <br />Town Center 7,380 <br />Public/Institutional 250 <br />Commercial/Industrial/Office 800 <br />Future flows from areas of redevelopment were added to existing flows to determine if existing <br />pipe capacities will be sufficient. In locations in which development will lead to pipes that are <br />under capacity, recommendations are made to address the issue. Areas that will need to be <br />served in the future were evaluated to determine the required sewer diameters and <br />improvements to serve these areas. <br />