2012-08-28_PWETC_AgendaPacket - Laserfiche WebLink

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HowwilI the drainage be addressed? Under traditional practice of stone water management rainwater Is allowed to flow out into the street and into stone sewers . Eventually it flows into Lake Owasso. This storm water carries pollutants such as sand chemicals, and fertilizers from our lawns and driveways. By Infiltrating the rainwater as dose as possible to where it falls ws can reduce the Impact on our lakes, as well as the local wildlire. As part of the project, ws will construct Best Management Practices (BMPS) to Improve storm water quality and collect runoff . Through the design process , ws will be identifying locations on the project suited fora BMP. The proposed BMPs would be constructed within the Qty right of way which extends approximately 16 feet behind the edge of the road The cost will be paid forwitlt city storm water funds. Rainwater Is routed to the BMP and allowed to percolate down Into the ground and be filtered by the plants . This trapping of water and the filtration process removes nutrients and pollutants . By acting as micro detention pond the plants and IIS provide an easy, natural way of reducing the amount of ter that flows from rooftops, lawns, wa driveways. Then using the concept of did - retention ,these gardens remove pollutants from storm water and help restore natural Infiltration. BMPSare design to overflow Into the stone sewer system during larger rain events . Storm water best management prasticesam tools that can be used to address water volume and quality . Like any tool, they should only be used where they will be effective . Factors that an Impact their success are soils, topography, and property owner support . Some brief descriptions of the types of BMPSwe are considering with this protect • Rain Garden: A rain garden is relatively small a of plantings near paved area Rain water Is routed to the garden where it Is used by the plants and Infiltrates naturally Into the soil of the garden. • Biofiltration Basin: A lumfi¢ ration basin Is similar to a rain garden In that itlsa relatively small a of plantings neara paved area. However, these are constructed In areas Mere the soils do not infiltrate Into the ground quickly. Rainwater is routed to the garden and filtered naturally by plants , but there is an overilowbh the storm sewer system. Rain garden In City street boulevard Infiltration trench An Infiltration trench is located underground This shallow excavation isfilled wdfh porous material to create an underground reservoirfor stonnwater runoff. The runoff gradually percolates through the bottom and the sides of the trench into the surrounding subsoil over period of days. Would you like a rain garden? Rain gardens constructed In conjunction wdth tonstruction projec s are a partnership between he property owners and the City of Roseville. All costs for materials, excavation and backfill are paid for by the City . The size location, and planting plan are coordinated w th the homeowner. The City contractor will prepare the site for the garden (excavate and make sure suitable soils are within the proposed rain garden) and deliver the plants . We ask that the homeowner plant and maintain the rain garden. We find this most effective, because the homeowner an modify the design if they want and they learn what each plants look like when planting them. This way they knowwhatto leave and what to pull when weeding. Homeowners are asked to sign a maintenance agreement for the rain gardens that are installed by the City . The City Is looking for volunteers. If you are interested In having the Qty construct rain garden in your boulevard please contact Deb Bloom at 651- ]92]042 or deb bloomm a roseville con us.