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I <br />I <br />I <br />I <br />I <br />i <br />i <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />i <br />I <br /> <br />Due to recent changes in the law regarding wetlands, there will <br />be a far greater area of ponding available for the City's <br />Ultimate Drainage System than originally planned for in the <br />City's Comprehensive Drainage Plan. A preliminary review of the <br />wetlands located in District Forty-Three (DFT) indicates the area <br />available for ponding is twice as large as proposed in the City's <br />Comprehensive Drainage Plan. Therefore,°by restricting the <br />outlet flow from the ponding areas, the downstream pipe sizes can <br />be substantially decreased. <br /> <br />Currently, a majority of the area in this drainage district does <br />not have an outlet to the Rum River. Due to recent heavy rains <br />and heavy snowfalls during the past year, the groundwater and <br />pond levels have risen to intolerable levels. Flooding is <br />presently occuring in the Flintwood Hills First Addition and <br />threatening personal property. To alleviate this problem and to <br />minimize impacts from heavy rainfalls, an outlet to the Rum River <br />is required. <br /> <br />III. DESIGN CONSIDERATIONS <br /> <br /> In designing the proposed facilities, the Soil Conservation <br /> Service (SCS) method of determining total runoff and peak rates <br /> of runoff was utilized. A 100 year frequency storm was used in <br /> determining ponding areas. The entire drainage district was <br /> analyzed using an IBM Personal Computer and the SCS 24-hour Type <br /> II Rainfall Program and the SCS Hydrograph Technique developed by <br /> Paragon Engineering Limited in Kitchene~, Ontario. <br /> <br />2 <br /> <br /> <br />