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Figure 54: Sewer Flow Forecasts by Sewer District <br />Sewer Flow Forecasts for North Trott Brook Sewer District <br />Year Households Peak Flow Employment Peak Flow Total Flow <br />-a (Sewer) Projection- (Sewer) Projection- <br />MGD MGD <br />2020 <br />2030 <br />2040 <br />672 <br />1089 <br />1288 <br />0.2 <br />0.2 <br />0.3 <br />42 <br />48 <br />52 <br />Sewer Flow Forecasts for Mississippi River Sewer District <br />0.0 <br />0.0 <br />0.0 <br />0.2 <br />0.2 <br />0.3 <br />Year <br />Households Peak Flow Employment Peak Flow Total Flow <br />(Sewer) Projection- (Sewer) Projection- <br />MGD MGD <br />2020 <br />2030 <br />2040 <br />2084 <br />3379 <br />3998 <br />0.5 <br />0.8 <br />0.9 <br />Sewer Flow Forecasts for Rum River Sewer District <br />5825 <br />6584 <br />7087 <br />1.3 <br />1.5 <br />1.6 <br />1.8 <br />2.3 <br />2.5 <br />2020 2164 0.5 413 0.1 0.6 <br />2030 3512 0.8 467 0.1 0.9 <br />2040 4154 0.9 502 0.1 1.0 <br />Inflow and Infiltration <br />Groundwater infiltration and surface water inflows, often called infiltration/inflow (I/I), may <br />contribute a substantial amount of municipal wastewater volume. Reducing I/I through proper <br />design, construction, maintenance, and other interventions can reduce the strain this puts on <br />municipal wastewater systems. <br />The Inflow and Infiltration (I/I) goal established for the City of Ramsey varies based on annual <br />average flow for each connection point to the Metropolitan Disposal System (MDS). The <br />Metropolitan Council's metering program shows that the City's 2017 annual average flow at meter <br />M302 was 0.567 mgd. The current I/I goal for the City of Ramsey at this point is an allowable peak <br />hourly flow of 2.54 mgd. The 2017 annual flow at meter M304 was 0.279 mgd. The current I/I goal <br />for Ramsey at this point is an allowable peak hourly flow of 1.29 mgd. <br />The City continues to monitor the integrity of its Sanitary Sewer infrastructure. The City has had a <br />Sewer Vac truck since 2009 and have a program in place to clean one third of the Sanitary Sewer <br />system each year In addition to cleaning the existing sewer system, the City has a program in place <br />to televise one tenth of the system each year to monitor for I/I issues. The City has historically <br />spent approximately $10,000 per year televising and mitigating I/I issues that are discovered <br />city of RAMSEY <br />August 2018 Draft <br />Comprehensive Plan 2040 <br />