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City of Arden Hills – 2030 Comprehensive Plan <br /> <br /> <br />Approved: September 28, 2009 <br />E-6 <br /> <br />Community Service Land Uses/No Flow 0 Gallons/Acre/Day <br />(POS, CD, RR, ROW) <br /> <br />The projected flow rate for residential properties is based upon the existing <br />known number of housing units per acre multiplied by a unit population density <br />factor, again multiplied by an average sewer use per person. The number of <br />units per acre for residential properties is based upon density assumptions <br />included in the City’s land use plan. The unit population density factor was <br />determined by dividing total population based on the 2010 US Census by the <br />total number of housing units in the City. The estimate of 60 gallons/capita/day <br />was based upon discussions with Metropolitan Council Environmental Services <br />(MCES) staff and some calibration of the projected flow rates with actual <br />metering records. <br /> <br />The projected flow rates for non-residential properties were based upon <br />discussions with MCES staff and some calibration of the projected flow rates with <br />actual metering records. <br /> <br />The projected 2015 flow rates for the combination of residential and non- <br />residential properties compares well with the historic metering records for the <br />years 2010-2014. <br /> <br />The projected flow rates for future TCAAP properties were based upon a <br />maximum sewer potential for a new development given the uncertainty of future <br />development. <br /> <br />The estimated wastewater flows projected in the Arden Hills System Statement <br />are based on the Metropolitan Council’s population, housing and employment <br />forecasts, and historical flow data. Projections for 2030 indicate an annual <br />wastewater flow of 1.47 mgd as shown at the bottom of Table E.3. In 2030, <br />Arden Hills predicts an annual wastewater flow of 1.73 mgd as shown at the <br />bottom of Table E.4. Arden Hills’ estimate is 18 percent higher than Metropolitan <br />Council’s projections; however, the flows shown in Table E.4 represent a <br />conservative scenario. <br /> <br />Table E.4 – Projected Sewer Flows by Interceptor by Year <br /> Projected Sewer Flow by Interceptor - Average Annual Wastewater Flow (MGD) <br />MCES <br />Interceptor 2010 (Actual) 2015 2020 2025 2030 <br />MCES 51 0.37 0.45 0.45 0.45 0.45 <br />MCES 52 0.04 0.04 0.04 0.04 0.04 <br />MCES 54 0.19 0.24 0.24 0.24 0.24 <br />MCES 59 0.26 0.36 0.36 0.36 0.36 <br />TCAAP 0.00 0.00 0.21 0.43 0.64 <br />Totals 0.86 1.09 1.30 1.52 1.73 <br />Table E.4 provides a summary of the projected 2010, 2015, 2020, 2025 and <br />2030 Average Annual Wastewater Flow (MGD) sewage flows for each