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S = (1000/cn) 10, dimensionless P = 2, inches I. The runoff value calculated in Step H for R 1 properties shall be considered the base rate. The runoff value for each of the other zoning classifications shall then be divided by the base rate to yield a utility factor for each zoning classification. This utility factor shall be a measure of the additional runoff created from the property as compared to a single family lot. The utility factors for each zoning classification shall be listed in the following subdivision. J. The rate per acre for all zoning classifications, except R 1, shall be calculated by multiplying the utility factor found in step I by the base rate determined in Step G. K. The owner(s) of any premise(s) shall be solely responsible for the payment of any storm water runoff charge calculated for the property. Subd. 4 Factors for Determining Fees for Various Land Uses. The utility factors for various land uses used to determine the surface water management fees are assigned as follows: Districts Land Use Utility Factor R 1 Single Family Residential (1\3 acre lots) 1.00 R 2 Single and Two Family Residential; (1/4 1.31 acre lots) R 3 Townhouse and Low Density Multiple 2.72 Dwellings R 4 Multiple Dwelling 2.72 1 1, 12 Limited and General Industrial 4.25 B 1, B 2 Limited and General Business 4.25 Subd. 5 Adjustment of Fees. The City Council may adopt an Ordinance for the adjustment of the surface water management fees. Information to justify a fee adjustment shall be supplied by the property owner. Surface water management fees shall be adjusted under the following conditions: A. The estimated expenditures for the management of surface water shall be revised at a frequency specified in this code. The fees shall be adjusted accordingly and will follow established City procedures for this adjustment of utility (water and sewer) rates. B. Changes in developed conditions of parcels. C. If it can be demonstrated that an individual parcel retains all or a portion of the rainfall that it receives, the surface water management fee shall be reduced by a percentage equal to that percent of the parcel which produces no external runoff. A fee reduction of 20 percent or greater must be demonstrated. Subd. 6 Undeveloped Land. Undeveloped properties, without regard to zoning classification, shall be assessed at one-half the rate, charged to developed property zoned as R 1. Subd. 7 Exemptions. The following land uses shall be exempt from the surface water management fee: A. Public Rights of Way; B. Lakes; and C. Parks.