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HOW TO CALCULATE A USER FEE? <br />6 <br />•Impervious surfaces generate runoff <br />•The more impervious surface a property owner has, the more runoff they send <br />through the City’s stormwater system <br />•Directly measuring runoff is not practical <br />•We instead measure impervious and assume a direct/proportional relationship to runoff generated <br />•This methodology is not unlike sanitary sewer user fees. Measuring wastewater is not practical, so <br />we instead measure water consumption and assume a direct/proportional relationship to <br />wastewater generated <br />•Equivalent Residential Unit (ERU) is basic unit of measurement and represents <br />the average impervious area of a typical single-family lot in Little Canada. This <br />is used to measure/quantify other property types. <br />•City’s GIS delineated impervious areas on <br />900+ residential properties <br />•Average impervious area = 3,913 SF <br />•Median impervious area = 3,556 SF <br />•1 ERU = 3,600 SF of Impervious