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2004-05-18_Agenda
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2004-05-18_Agenda
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Commission/Committee
Commission/Authority Name
Housing Redevelopment Authority
Commission/Committee - Document Type
Agenda/Packet
Commission/Committee - Meeting Date
5/18/2004
Commission/Committee - Meeting Type
Regular
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15.Stormwater: <br />Existing water capacity should be expanded and improved in all ponding areas. The existing <br />pond will be improved for water quality, storage and aesthetics. A walking path around the pond, <br />or areas public enjoyment of the water should be a part of the reconstruction if financially <br />feasible. Any redevelopment in the study area will require some types of water retention system. <br />Innovative on-site management of storm water through rain gardens, storage in and under <br />parking lots as well as providing on-site ponding that is an amenity to the development will be <br />encouraged. (Refer to Appendix C for Estimated Impervious Surface Map) <br />The Capital Region Watershed District (CRWD) reviewed the concept plans prepared as part of <br />this Master Plan Study. A summary is presented below. <br />Assumptions: <br />A 25-foot setback from the wetland. Wetland delineation should be completed prior to <br />final approval of development plans. <br />The vacant parcel on Elmer Street is being considered for development and included in <br />their analysis. (Conversations with the property owner indicated that there is no plan to <br />develop the site in the near future). <br />Total development based upon 40 new units. <br />Guptil site will be developed on both the north and south sides. <br />Impervious surface of 15,000 sq.ft. on the south side of Guptil and 10,000 sq.ft. on the <br />north side of the site. (This impervious surface may change based upon a shared parking <br />arrangement with the Church). <br />Conclusions: <br />Stormwater Management: A wet-bottom detention basin should be located to the west <br />side of the Guptil parcel on the Armory site. (This has not been approved by the Armory <br />but has been proposed). The detention pond would be connected to the existing pond on <br />the Armory site via a drainage way or swale located along the north property line. The <br />south portion of the Guptil site should need to be regarded to direct the runoff into the <br />proposed basins. Based upon some preliminary modeling, it is expected that this new <br />pond or basin can meet the CRWD’s requirement that the existing peak discharge rates <br />for the 2, 5, 10 and 100 year storm events. However, as part of the development <br />proposal, verification and remodeling must be completed to better determine proposed <br />discharge rates. <br />Water Quality: Initial modeling indicated that approximately 63.5% in annual total <br />phosphorus reduction will be achieved through the assumed pond configuration. Based <br />upon these assumptions, the pond is sized appropriately in order to meet CRWD’s <br />DRAFT MAY 18, 2004 14 <br /> <br />
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