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210 Action to Date: <br />211 This subwatershed was added as a problem area in 2006. In an effort to address some of <br />212 the flooding concerns in this problem area, staff will continue to require redevelopment <br />213 proj ects to reduce the volume of water that is sent to this system. A reduction in the peak <br />214 flow from the commercial properties located in the subwatershed will alleviate the <br />215 demand on the Gottfried Pit. <br />216 <br />217 <br />218 <br />219 <br />220 <br />221 <br />222 <br />223 <br />Recommended 2009 action: <br />In an effort to address some of the flooding concerns in this problem area, staff will <br />continue to require redevelopment projects to reduce the volume of water that is sent to <br />this system. <br />H. Area 8: Center Street <br />For years we have been working on finding a resolution for street flooding at the <br />intersection of Center Street and Rice Street. This is the result of the sediment that has <br />accumulated in the ditch located on the east side of Rice Street in the City of Maplewood. <br />224 Center Street drains under Rice Street via a culvert, the sediment in the receiving ditch <br />225 causes Roseville's side of Rice Street to flood. As a result, any solution for this street <br />226 flooding requires cooperation from Maplewood. Since it is a cross jurisdictional issue <br />227 that involves the Trout Brook Interceptor, CRWD needs to be involved. The three <br />228 jurisdictions have agreed that CRWD will study the problem and recommend a solution. <br />229 <br />230 <br />231 <br />Action to Date: <br />This subwatershed was added as a problem area in 2007. <br />Recommended 2009 action: <br />232 To date we have not come to an agreement about a solution for this drainage concern. <br />233 Staff feels that since all the issues surrounding this subwatershed have not been <br />234 addressed, this subwatershed should be added as a problem area within the CSWMP. <br />235 <br />236 <br />237 <br />238 <br />239 <br />240 <br />241 <br />L Area 9: Walsh Lake Subwatershed <br />On March 24, 2008, the City Council authorized a study of the storm water hydrology of <br />the Walsh Lake subwatershed located in the neighborhood southeast of Midland Hills <br />Golf Course ("Rosewood Neighborhood") due to neighborhood concerns about localized <br />street flooding and damage to property. This area includes the following streets: Midland <br />Hills Road, Draper Avenue, Rosedale Drive, Westwood Circle, Hythe Street, Skillman <br />Avenue, North Rosewood Lane, and South Rosewood Lane. <br />242 An XP-SWMM model was created for this area. The XP-SWNINI analysis allows us to <br />243 evaluate the performance of the system during intense rain events. The model predicts the <br />244 elevation of flooding within wetlands, low areas and intersections in this neighborhood. <br />245 A separate model was executed for the 2, 5, 10 and 100-year storm events. The storm <br />246 events are 2.8", 3.6", 4.2", and 6" of rain in a 24-hour period, and have annual return <br />247 probabilities of 50%, 20%, 10%, and 1%, respectively. <br />248 The existing storm sewer system in the Rosewood neighborhood consists of a network of <br />249 pipes that lead to a manhole at Draper Avenue and Midland Hills Road. From this <br />250 manhole, the storm water runoff flows through a dual pipe system west to Walsh Lake. <br />251 Our current design standard for storm sewer is a 10-year event. The existing storm sewer <br />252 system was built in the 1970s. Additional build-out of the neighborhood, which included <br />City of Roseville <br />2008 Storm Water Annual Report Page 7 of 14 <br />