2007-01-23_PWETC_AgendaPacket - Laserfiche WebLink

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Roseville Public Works, Environment and Transportation Commission Agenda Item Date: January 23, 2007 Item No: 8 Item Description: Brenner Millwood Storm Water Study Discussion Background: The residents in the area of the Millwood Avenue and Brenner Avenue intersection have expressed concern about periodic flooding throughout the neighborhood during heavy rains. Several studies have been completed over the years for the area surrounding Charlie Pond. The City Council recently approved a contract with URS, Inc. to complete an updated study of the area. Attached is URS' summary of the modeling completed in the area. Based on the results of the modeling, staff suggests the following modifications to the system to alleviate some of the flooding in the area: Avon Street low point Flooding at the low point of Avon Street between Millwood Avenue and County Road D is a result ofa deficiency in inlet capacity. Staff proposes the construction of two additional catch basins to provide additional inlet capacity and decrease the depth of the water during heavy rain events. Yard catch basins at 815 Millwood Avenue Three catch basins are located in the yard of815 Millwood Avenue, which drain backyard stormwater runoff to the stormwater pipe on Millwood A venue that outlets at Charlie Pond. Since the area is primarily green space, the runoff is not loaded with as many sediments or pollutants as would be from paved surfaces. If this segment were redirected to bypass Charlie Pond and drain directly to Lake Owasso, this would reduce the amount of water draining to Charlie Pond. This, in turn, would help reduce the depth of flooding that occurs in the street at the low point on Millwood Avenue south of Brenner Avenue. This would be accomplished by constructing a new structure over the existing pipe that drains to Lake Owasso, cOlmecting the three catch basins to this pipe and disconnecting them from the pipe draining to Charlie Pond. The pipe is located in the boulevard; the street would not be disturbed for this work.