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Honorable Mayor, City Council and Staff <br /> • City of St.Anthony <br /> February 2, 1999 <br /> Page 2 <br /> • Option No. 3: Acquire six homes south of Silver Point Park and along the frontage <br /> road of County Road (CR) 88. This option provides approximately 4.27 acres for <br /> storm water storage. This option also utilizes the existing frontage road and Trillium <br /> Park for storm water storage. It is estimated that approximately 20 acre-feet of <br /> additional storm water storage could be provided within this area. <br /> 3. If the large pipes (72") have 100 year flood protection, how much smaller can the pipes <br /> be without decreasing the flood protection in Alternative No. 1, as stated by D. Palmer? <br /> As indicated by Mr. Palmer, an overland/overflow route does exist along Wilson Street to <br /> 29th Avenue. From there,water continues south to the alley north of St. Anthony Boulevard, <br /> proceeding to the east,then south along the parcel the City has acquired on the north side of <br /> St.Anthony Boulevard. It is anticipated that if the overland/overflow route was maximized, <br /> the pipe sizes upstream of St. Anthony Boulevard and Wilson Street may be reduced by one <br /> or maybe two sizes. <br /> Maximizing the overland rate would require special structures to be constructed in the <br /> vicinity of St. Anthony Boulevard or Pahl Avenue to collect this water and convey it to the <br /> • storm water storage area. This option would increase the risk of damage to homes in the <br /> Pahl Avenue and St. Anthony Boulevard areas by routing significant volumes of water <br /> overland. <br /> 4. How much wetter will Silver Point Park get if the Harding Pond is not completed? <br /> Silver Point Park will be subject to inundation for rain storm events greater than one inch in <br /> 24 hours. In addition, for those storm events such as the one-year, two-year, and five-year <br /> rainfall events, water will pond to greater depths for longer periods of time. <br /> S. What, if any, are the situations that would cause Roseville's water to back up into Silver <br /> Point Park? <br /> The City of Roseville storm water connection north of County Road C has a drainage area <br /> of approximately 17 acres with two ponding locations prior to discharging into the City of <br /> St. Anthony system with an 18-inch RCP. The volume of runoff and rate at which runoff <br /> leaves the Roseville site is anticipated to have a minimal affect on the performance of the <br /> City of St. Anthony's storm sewer system tributary to District 6. <br /> If you have any further questions, I will be available at your February 2"d Task Force Meeting to <br /> discuss these issues with you. <br /> nm <br /> F\WPWM]065 40\020299-hmc wpd <br />