CCP 11-10-2003 - Laserfiche WebLink

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I Ie I I I I I I I .. I I I I I I .. I I c. Proposed Drainage/Water Quality Improvements Drainage Overview The existing surface drainage patterns for the neighborhood are illustrated in the exhibits in the appendix. The majority of the Edgewater neighborhood drains overland, to the existing wetland at Lake Lane and Edgewater A venue. A significant amount of water drains overland to Lake Josephine (south of Edgewater Avenue). Between the two Shoreline Lane cul-de-sacs and including a portion of the south cul-de-sac, runoff drains into a couple of existing small storm ponds. The remaining Shoreline neighborhood flows overland, through the County Road D pond to Lake Josephine. The proposed drainage improvements will maintain existing drainage patterns while incorporating low impact stilling basins to improve water quality as described below: Edgewater Avenue System Proposed storm sewer improvements associated with the Edgewater Avenue system include the creation of a storm water pond for the Edgewater Avenue and Lake Lane storm sewer outlets. The property at Edgewater and Lake Lane was recently transferred from Ramsey County to the City for drainage purposes. The proposed stilling basin will have an initial forebay which is designed to collect sediment and salts from runoff, preventing them from settling in the larger pond. This makes pond maintenance more efficient, as the majority of the sediment is in the forebay and can easily be cleaned out. The larger pond will be designed to contain a 2.5" rainfall over the entire tributary neighborhood to the pond. The proposed pond system will meet the guidelines for the National Location afproposed pond at Edgewater and Lake Lane Urban Runoff Program (NURP) which should remove between 60% and 80% of pollutants from the runoff prior to discharging into the natural wetland area to the north. 6