2008-02-26_PWETC_AgendaPacket - Laserfiche WebLink

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269 Recorazr~7ended 2008 actio~~. 270 To date we have not came to an agreement about a solution for this drainage concern. 271 Staff feels that since all the issues surrounding this subwatershed have not been 272 addressed, this subwatershed should be added as a pi°ablem area within the CSWMP. 273 274 III. 2007 New Problen~x Areas 275 One of the goals from the City's CSWMP is to provide flood protection for all residents and 276 structures as well as protect tl~e integrity of conveyance channels arcd storm water detention 277 areas. Many different policies were identified in the plan to accomplish this. For the purposes of 278 this report, we want to discuss one in particular. 279 Policy 1.9 -Developer responsibility for addressing existing storm water problems 280 For development and redevelopment projects affecting storm water problem areas identified 281 in this CSWMP, the City requires the developer to incorporate such practices as are 282 necessary to resolve a proportionate share of the problem.. 283 284 In the interest of applying this policy to proposed developments, wo have identified the 285 following as new problem areas to add to the CSWMP. 286 287 A. Walsh Lake Snbwatershed 288 The residents at 2201 and 2211 N. Rosewood Lane have contacted the City concerned 289 about the wetland that is located between 2235 and 2211 N. Rosewood Lane. This 290 wetland curves around the back of these homes and is com~ected to the City's storm 291 sewer system. 292 293 After an extreme event the water levels in the wetland rise to an elevation that is close to 294 the lowest ingress into these homes. Street flooding also has been observed along 29S Midland Hills Road at S. Rosewood Lane. Also, the home at 2241 S. Rosewood Lane 296 has experienced flooding. Over the years we have worked with the residents on different 297 solutions to their concerns. In 2001, we installed a curb cut in the street to provide an 298 emergency overflow for the wetland. 299 300 In order to better understand the cause for these concerns, and to verify the design of the 301 in place sto~-~n sewer pipe in this neighborhood, we completed a rudimentary drainage 302 study of the Walsh Lake subwatershed in 2007. This study evaluated the capacity of the 303 storm sewer pipes and inlets located in the single family neighborhood located north of 304 Roselawn, west of Cleveland, and southeast of Midland Hills Country Club. The City 30S designs its storm sewer trunk lines and inlets to be able to handle a 10-year storm event 306 (4.2" of rain in a 24-hour period}. What this study showed was that the pipes that wore 307 installed in this neighborhood do not accommodate tlxis minimum design evont. 308 309 In order to identify solutioa~s, and gauge neighborhood support, we held a neighborhood 310 mooting on January 10, 2008 to discuss ways to address this issue. This meeting was 311 attended by 40 property owners, many of whom had experienced drainage issues. 312 City ol" Roseville 2007 Storm Water Annual Report Page S of IS