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220 <br />Table 63: Sewer Flow Forecasts by Sewer District <br />Sewer Flow Forecasts for North Trott Brook Sewer District – To Meter M302 <br />Year Households <br />(Sewer) <br />Flow <br />Projection- <br />MGD <br />Employment <br />(Sewer) <br />Flow <br />Projection <br />-MGD <br />Total <br />Flow <br />2020 372 0.1 42 0.0 0.1 <br />2030 745 0.2 48 0.0 0.2 <br />2040 1,311 0.3 52 0.0 0.3 <br />Sewer Flow Forecasts for Rum River Sewer District – To Meter M302 <br />Year Households <br />(Sewer) <br />Flow <br />Projection- <br />MGD <br />Employment <br />(Sewer) <br />Flow <br />Projection <br />-MGD <br />Total <br />Flow <br />2020 3,514 0.8 413 0.0 0.8 <br />2030 3,690 0.8 468 0.0 0.8 <br />2040 3,945 0.9 502 0.0 0.9 <br />Sewer Flow Forecasts for Mississippi River Sewer District – To Meter M304 <br />Year Households <br />(Sewer) <br />Flow <br />Projection- <br />MGD <br />Employment <br />(Sewer) <br />Flow <br />Projection- <br />MGD <br />Total <br />Flow <br />2020 1,114 0.2 5,825 0.4 0.6 <br />2030 2,415 0.5 6,584 0.5 1.0 <br />2040 3,684 0.8 7,086 0.5 1.3 <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 />during the televising process. Items that are repaired though this process include: private utility <br />hits, leaking joints, collapsed pipes and leaking manholes. <br />Table 65 shows the number residential units within the City that were built bef ore 1970 vs those <br />built from 1970 to the present. It also breaks out the percentage of pre-1970 residential units that