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reasonable and practical limits. The provisions of this Section undertake to establish a <br />reasonable and practical methodology for making such charges. <br /> <br />4.80.03 <br /> <br />Rates and Charges <br /> <br /> Subdivision 1. Residential Equivalent Factor. Rates and charge for the <br />use and availability of the system shall be determined through the use of a Residential Equivalent <br />Factor ("REF"). For the purposes of this Section, one REF is defined as the ratio of the average <br />volume of surface water runoff coming from one acre of land and subjected to a particular use, to <br />the average volume of runoff coming from one acre of land subjected to typical single-family <br />residential use within the City during a standard on.e-year rainfall event. <br /> <br /> Subd. 2. Determination of REF's. The REF shall be based on the relative <br />runoff generated by any land use compared to the expected runoff from a typical single-family <br />dwelling. This relationship shall be interpreted as a function of the percent of the total lot area <br />which is impervious and shall be applied as determined in the table below. <br /> <br />STORM SEWER RESIDENTIAL EQUIVALENT FACTOR <br /> <br />% Coverage Q-Runoff (in.) REF/Acre <br /> <br />% Coverage Q-Runoff (in.) REF/Acre <br /> <br />1 0.88 1.02 26 <br />2 0.90 1.08 27 <br />3 0.92 1.14 28 <br />4 0.94 1.20 29 <br />5 0.95 1.25 30 <br />6 0.97 1.30 31 <br />7 0.99 1.35 32 <br />8 1.01 1.40 33 <br />9 1.02 1.44 34 <br />10 1.04 1.48 35 <br />11 1.06 1.52 36 <br />12 1.08 1.56 37 <br />13 1.09 1.58 38 <br />14 1.11 1.63 39 <br />15 1.13 1.67 40 <br />16 1.15 1.70 41 <br />17 1.16 1.73 42 <br />18 1.18 1.76 43 <br />19 1.20 1.79 44 <br />20 1.22 1.82 45 <br />21 1.24 1.85 46 <br />22 1.26 1.88 47 <br />23 1.28 1.91 48 <br />24 1.30 1.94 49 <br />25 1.32 1.97 50 <br /> <br />1.34 2.00 <br />1.35 2.02 <br />1.37 2.04 <br />1.38 2.06 <br />1.40 2.09 <br />1.42 2.12 <br />1.44 2.15 <br />1.46 2.18 <br />1.48 2.21 <br />1.50 2.24 <br />1.53 2.28 <br />1.55 2.31 <br />1.57 2.34 <br />1.59 2.37 <br />1161 2.40 <br />1.63 2.43 <br />1.66 2.48 <br />1.68 2.51 <br />1.70 2.54 <br />1.72 2.57 <br />1.74 2.60 <br />1.76 2.63 <br />1.78 2.66 <br />1.81 2.70 <br />1.83 2.73 <br /> <br /> <br />