§ 158.049 BASIC DRAINAGE PLAN.
   (A)   Topographic Map. A topographic survey of the property at one-foot contours under existing and proposed conditions, and areas upstream and downstream, necessary to determine off-site impacts of the proposed drainage plan. The map datum shall be correlated to a FEMA reference mark.
   (B)   The applicant shall also provide a copy of USGS and FIRM maps delineating the proposed development site.
   (C)   Drainage system. Mapping and descriptions, where relevant, of existing and proposed drainage system features of the property and immediate vicinity including:
      (1)   The banks and centerline of streams and channels;
      (2)   Shoreline of lakes, ponds, and detention basins;
      (3)   Farm drains and tiles;
      (4)   Sub-watershed boundaries within the property;
      (5)   Watershed soils classifications;
      (6)   The property's location within the larger watershed;
      (7)   Location, size and slope of stormwater conduits and drainage swales;
      (8)   Sanitary or storm sewers;
      (9)   Depressional storage areas;
      (10)   Delineation of upstream and downstream drainage features and watersheds that might be affected by the development;
      (11)   Detention facilities;
      (12)   Roads and streets and associated stormwater inlets;
      (13)   Base flood elevation, regulatory floodway, and 100-year base floodplain limit delineation based on topography and the FEMA map;
      (14)   Basis of design for the final drainage network components.
   (D)   Environmental features. A depiction of environmental features of the property and immediate vicinity including the following:
      (1)   The limits of wetland areas;
      (2)   Any designated natural areas; and
      (3)   Any proposed environmental mitigation features.
      (4)   A copy of the National Wetlands Inventory Map delineating the proposed development site.
(Ord. 04-02, § 158.013.01, passed 4-5-04)