Final drainage plans shall be submitted to the CCDB. Before final subdivision plat approval or before construction for all other developments, the final construction plans shall provide or be accompanied by calculations, maps and/or other descriptive material including:
(A) Cover sheet.
(1) Location map with the site outlined;
(2) Title block: title of development, name and address of developer, name and address of professional engineer or professional land surveyor, date of preparation, revision dates;
(3) Index of sheets;
(4) Engineer’s or land surveyor’s seals and signatures; and
(5) Construction notes.
(B) Composite Drainage Plan.
(1) Topography: minimum scale one inch equals 100 feet with existing contours at two-foot intervals, NGVD datum. Contours to extend a minimum of 50 feet beyond property lines;
(2) Proposed development: street rights-of-way, street names, street centerline stationing, lot lines, lot numbers, property boundary, existing drainage structures, proposed drainage structures (labeled by number or other designation) and easements with widths shown;
(3) Hydrologic data: designate drainage areas (in acres) to individual inlets, and off-site drainage areas (acres), which generate through drainage;
(4) Pipe chart: pipe number, drainage area, coefficient of runoff (c), time of concentration, intensity, discharge (Q), size, length, slope, capacity, velocity (refer to Appendix Section 1: example #1);
(5) One hundred-year FEMA and local regulatory floodplain and conveyance zone, if applicable, with flood elevations noted; and
(6) Identification of outlet system.
(C) Plan and profile (road) sheets.
(1) Plan view.
(a) Catch basins: line and station number (structure number), grate type and elevation, invert elevation(s);
(b) Pipes: length, size, type, slope, pipe number of designation;
(c) Headwalls: type, invert elevation;
(d) Ditches and swales: number or designation, type, stations;
(e) Easements: type, size, existing with deed book and page numbers, proposed;
(f) Utilities: existing and proposed (including sanitary sewers); and
(g) Other drainage structures to be labeled accordingly. (Refer to Appendix Section 1: example #2 for matters pertaining to Items a. through g.).
(2) Profile view.
(a) Storm lines and structures to be shown on road profiles; and
(b) Utility and sanitary sewer crossings.
(3) Storm drainage profiles (pipes, ditches, box culverts).
(a) Catch basins: station or number, type, grate type and elevation, invert elevation(s);
(b) Pipes: length, size, type, class, grade, line number, headwater elevations for the 100-year storm (determined from inlet and outlet control analysis);
(c) Ditches:
1. Type;
2. Grade;
3. Flow line elevation at grade changes (P.V.I.);
4. Design depth;
5. Manning’s “n”;
6. Slope;
7. Ten-year velocities;
8. One hundred-year velocities; and
9. One hundred-year discharge depths.
(d) Headwalls: type and invert elevation; and
(e) Existing and proposed ground surfaces. (Refer to Appendix Section 1: example #3 for matters pertaining to Items a. through e.).
(Ord. 2010-11, passed 7-22-2010)