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Page 9 <br /> enlargement of the. system :-.The alternative selected to achieve this <br /> using the Soil .Conservation.,.Service Technical Release No. 55 was, for a <br /> two inch total rainfall amount with antecedent moisture condition II. ' <br /> 6. :Credit System. -- It was decided 'that for fairness and to-encourage <br /> and reward those property owners who were assisting' the overall city <br /> system by reducing the overall amount of water, slowing it down, or <br /> improving its quality, that a credit system should be provided. <br /> Because of the fact that the city was essentially developed and most <br /> of the collection system already existed, the decision was made that <br /> up to. 50% of the fee could be reduced by providing water quality <br /> benefits and up to 25% by reducing the rate of flow. Wet ponds were <br /> determined to be the best way for water quality improvement and <br /> Brune's trap efficiency curve was used as the basis for determining <br /> that aspect. The 250 available credit for slowing the water down was <br /> broken into two potential steps. Ten • <br /> p p percent of it would be granted <br /> if the peak outflow rate was reduced to a five year' rainfall event <br /> for- predevelopment conditions, and an additional 15p if that could be <br /> done for a 100 year event.. Reductions in the charge would also be <br /> granted if the property owner could demonstrate that the actual <br /> development on! his parcel was significantly less than the standards <br /> established for the normal parcel of that particular land use zone. <br /> 7. Set Fees -- Using the SCS two inch rainfall for a *single-family <br /> parcel as a basis and assuming that the average lot was one-third of <br /> an acre in size, a ratio of charges was developed for each type 'of <br /> land_ use zone in the city. Where similar ratios existed for various <br /> type of land use, these were combined into a single classification <br /> for determining the actual. fee. The following table identified as . <br /> "Roseville Storm Drainage Utility" shows the actual fees developed by <br /> Roseville. Please note that the fee system is not identical to <br /> the percent of imperviousness assumed on each land use zone. As an <br />