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STORMWATER MANAGEMENT DESCRIPTION: <br />The plan for this project is to employ "low impact development techniques" to attenuate <br />and treat runoff. A two-step approach is proposed to manage runoff from the Central <br />Corn of the developed area. <br />STEP 1: Direct street and drive�vay runoff to the Rain Gardens located along <br />the perimeter of the roadway. <br />STEP 2: Allow runoff that exceeds the storage capacity to flow into the three <br />compost berms. <br />Runoff generated within the Northern Tier will be managed by dispersion of runoff to <br />compost-amended soils covering the backyards. A FrencYi drain along the nortti <br />property line collects surface runoff and focting drains, ancl directs it to a bubble-up <br />basin within the wetland buffer. The French drain also helps prevent saturated soils. <br />The Southern Tier is simpler, with bubble-up basins tor footing drains and dispersion of <br />roof drains to the back yard compost-amended soils. The existing southwesterly slope <br />of the buffer encourages subsurface flow that will reduce the risk of saturated backyard <br />soils. <br />This design rnimics the predeveloped runoff patterns — the rainfail is provided the <br />maximum opportunity to infiltrate, and concentrated flows are dispersed. The combined <br />effect of the storage and infiltration fuliy mitigates the increased runoff from the site. <br />The specific methods and specifications for achieving this plan are detailed in the <br />remainder of this report. <br />HEARTNSTONE LANE 2 DRAINAGE REPORT <br />APRIL 2006 <br />