2007-01-23_PWETC_AgendaPacket - Laserfiche WebLink

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Introduction One part of the City's Comprehensive Surface Water Management Plan, is for staff to provide a brief annual report to summarize development changes, capital improvements, and other water management-related issues that have occurred over the past year. In the past this has been completed as a part of the SWPPP Annual Report. In the interest of providing a more in depth discussion of the storm water issues that staff has worked through during the course of the year we are providing this as a separate document. This will allow us to include more information and enable us to better plan for future storm water needs. The City's CSWMP recommends that we review the plan every 5 years to determine if updates are needed. Also, as a part of the 2008 Comprehensive plan update, the City's CSWMP will need to be amended to ensure that it meets all of the new requirements of the Metropolitan Council. The recommendations from this annual report will be incorporated into that update. City staff keeps track of the majority of the rainfalls that occur within the City. This is accomplished through a gauge at the Maintenance Building. We have included this information at the end of this report. The report includes the following sections; CSWMP Problem Area Updates, 2006 New Problem Areas, 2006 City Projects, 2006 Redevelopment Projects, and Other Drainage Concerns. CSWMP Problem Area Updates Five problem areas were identified as a part of the 2003 CSWMP. Over the past 4 years we have been able to address some of these areas through additional study or construction projects. Some of the issues that were identified have been resolved while others have developed new concerns. What follows is a summary of the status of these problem areas. . Area 1- Avon- Brenner. Over the years, the City has made a number of improvements to address street flooding on Avon Street and Millwood Avenue as well as increasing the pollutant removal efficiency within the Charlie Pond subwatershed of Lake Owasso. Changes in subwatershed boundaries, the addition of the Valley Park ponds, new outlets, and larger pipes have all played a role in improving the drainage for the area. As recently as 6 years ago there were 13 vacant lots in this neighborhood. In the last 6 years, 7 of these lots have been developed as single family homes. 6 of these lots are located along the south side of Brenner Avenue west of Millwood Avenue. As these lots continue to be developed, renewed neighborhood concern has been expressed about the need for additional storm water improvements for this sub watershed. One of these vacant lots is between 812 and 800 Brenner Avenue and has a low area that drains into the City's system. To determine the role that this low lot plays in the updated overall storm water system, a new model needs to be created. Action to date: While this area has been modeled in a variety of formats over the last 20 years, numerous changes and modifications have been made within the watershed. This past summer, we City of Roseville 2006 Storm Water Annual Report Page 2 of 11