2009-04-28_PWETC_AgendaPacket - Laserfiche WebLink

Home

,125 subwatershed. Flooding at Fairview would be reduced to 3.3 feet. Estimated cost: 126 $156,000. 127 Option 3: Provide aggressive rate control for the Rosedale Mall site. 128 This option assumes a 40% reduction in peak flow from the Rosedale Mall site. It also 129 assumes that options 1 & 2 are implemented. Estimated Cost = $787,318 + costs for 130 Rosedale improvements. l 31 Option 4: Construct a new storm sewer trunk line along Fairview Avenue. This option 132 includes the construction and reconfiguration of the Fairview trunk storm sewer. It 133 eliminates flooding under TH 36 and on Gluek Lane; however, it pushes the water 134 downstream to the pond. in the SE corner of Fairview and C, increasing the high water 135 elevation by 1.3 feet. Estimated cost: $1,935,000. 136 Action to date: 137 The only option discussed in the CSWMP that addressed the street flooding issues 138 completely was Option 4; however, due to potential impacts to the homes located around 139 the pond in the SE corner of Fairview and County Road C, staff does not feel that this 140 option is feasible. After a 6-inch rainfall event that occurred 10/4/2005, we experienced 141 localized flooding in a number of different areas around the City. Th.e home at 1779 142 Rose Place was flooded during this extreme rain event. 143 Due to the cost, limited benefit, and potential impacts to the properties located around the 144 pond at Fairview and County Road C, staff does not recommend proceeding with any of .145 the options as described in the CSWMP. 146 Recnmmerrded 2009 action: 147 In an effort to address some of the flooding concerns in this problem area, staff will 148 continue to require redevelopment projects to reduce the volume of water that is sent to 149 this system. This is similar to the action described in Option 3. A reduction in the peak 150 flow from the commercial properties located in the subwatershed will alleviate the 151 demand on the Fairview trunk sewer. 152 On December 27, 2007 the City purchased the home at 1779 Rose Place as way to 153 eliminate the potential of future property damage during extreme storm events. This 154 house was demolished in 2008. In 2008, Rice- Creek Watershed District completed the 155 "Southwest Urban Lakes Study"; a roadmap by the Watershed District for future 156 management activities and water quality improvement prajects. This site was identified 157 in the Little Lake Johanna Management Action Plan for a potential surface feature to treat 158 local street runoff from Rase Place. The City will work with Rice Creek on the 159 implementation of this plan. 160 E. Area S: Arona Pond and surrounding area. 161 Arona pond is located within the Applewood Pointe redevelopment area. Prior to 162 development, this pond was a landlocked basin. For years, the normal water level of the 163 pond was governed by infiltration. As the surrounding area developed, the basin became 164 apart of the storm water system. An outlet was installed around l 979 that enabled the 165 basin to pass runoff from extreme events. Approximately 1 l2 acres contribute runoff to 166 Arona Pond. Over the years, the sandy bottom of this pond became sealed with sediment, City of Roseville 2008 Storm Water Annual Report Page S of 14