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Table 303 <br />Stormwater Management Manual <br />Drainage Plan Cbecklist <br />Instructions: 1. <br />Applicant to identify with a "check- mark" if information is provided. If applicant <br />believes information is not required, indicate with "n1a ". <br />2. <br />County will determine if information labeled 'Wa" is required and whether <br />information must be submitted. <br />I. EXISTING FACILITIES <br />A <br />Contours at two foot intervals, based on USGS datum. Contours to extend at least <br />50 feet past property line. <br />B. <br />Location and elevation of USGS benchmarks or benchmarks referenced to USGS. <br />C. <br />Property lines. <br />D. <br />Drainage easements. <br />E. <br />Street names. <br />F. <br />Major and minor channels and floodplains. <br />II. PROPOSED FACILITIES <br />A. <br />Contours at two -foot intervals, based on USGS datum. <br />B. <br />Property lines. <br />C. <br />Drainage easements. <br />D. <br />Street names and grades. <br />E. <br />Right of way and easement. <br />F. <br />Finished floor elevations for protection from major storm run -off. <br />G. <br />Detention pond information: <br />1. Location of each detention pond with site at V =50' scale or larger with 2 -foot <br />contour intervals. <br />2. Inlet and outlet structure, and trickle channel design details. <br />3. Details of emergency spillway and channel. <br />4. Landscape information, including side slopes, vegetation and planting <br />requirements. <br />5. Details of water quality outlet structure. <br />N. <br />Channel Information: <br />1. Profiles with existing and proposed grades. <br />2. Cross sections on 100 -foot stations showing existing and proposed topography <br />and required rights of way. <br />3. Locations and size of all existing and proposed structures. <br />4. Locations and profiles of adjacent utilities. <br />5. Typical channel section and lining details. <br />I. <br />Storm sewer information: <br />1. Alignment and location of manholes, inlets, and outlet structures. <br />2. Profile of invert and pipe crown. <br />3. Invert elevations at manholes and inlets. <br />4. Lengths and grades between manholes and inlets. <br />5. Locations and elevations of utilities adjacent to and crossing storm sewer. <br />6. Easement and other O &M access geometry. <br />7. Outlet details, such as end sections, headwall and wingwalls, erosion control, <br />and vegetation. <br />J. <br />Street cross sections with design 100 -year flood depth. <br />K. <br />Other drainage related structures and facilities, including underdrains and sump <br />pump discharge lines. <br />L. <br />Other permanent BMP measures to control pollutant discharges to the County's MS4 <br />system. <br />Page 1 of 2 <br />