(A) Construction plans are to be submitted for all major subdivisions. Construction plans shall be submitted concurrently with or following the preliminary plat and shall be revised to conform to the preliminary plat as approved by the Planning Commission. Construction plans shall be designed in accordance with requirements and specifications outlined in these regulations and per the City of Franklin Stormwater Management Ordinance. The complexity of plans submitted shall be commensurate with the complexity and nature of the development proposed.
(B) All construction plans and supporting documents shall be stamped by a professional engineer registered in the State of Kentucky. The Planning Commission will consider no final plats for approval, and no land disturbance permits shall be issued, until the City Engineer has approved a set of construction plans. Following required revisions and final city approval of the construction plans, a pre-construction conference shall be held between the applicant and city staff. All construction plans shall, at a minimum, contain the following. Additional requirements are located in the Roadway and Drainage Technical Standards Appendix to these regulations:
(1) Title and cover sheet.
(a) Name of development;
(b) Name and address of developer(s);
(c) Name and address of engineer and/or surveyor;
(d) Professional engineer's and surveyor's stamp and/or signature; and
(e) Location map.
(2) Details sheets.
(a) Headwalls;
(b) Typical road sections;
(c) Typical ditch sections;
(d) Cross drain details;
(e) Erosion control structures; and
(f) Any other structures or construction requirements of special details at the discretion of the City Engineer.
(3) Street plan and profile sheet.
(a) Detail plans plotted on plan and profile sheets to a minimum scale of 1" (one inch) = 50' (fifty feet) horizontal, and 1" (one inch) = 5' (five feet) vertical;
(b) Plan section including the street and right-of-way plotted to the proper scale with stationing shown, and matching that of the profile section as nearly as possible;
(c) Typical roadway sections, as appropriate;
(d) Where conventional roadway sections are used, the stabilization required for the roadside ditches, including the linear extent and type of stabilization required;
(e) Profile section plotted to the same scale as identified above and including the proposed centerline finish grade profile, in addition to the existing centerline profile with roadside ditch profiles;
(f) All vertical control points on or pertaining to the proposed centerline profile such as P.V.C., P.V.I., and P.V.T.; all low points and street intersections as to station and elevation;
(g) For all percent grades and for vertical curves design curves in accordance with the Roadway and Drainage Technical Standards contained as an Appendix to these regulations;
(h) Centerline finished grade elevations every 50 feet, or cut sheets, to the nearest hundredth of a foot, at the bottom of the profile sheet;
(i) The proposed location of all traffic signs, warning signs, and regulatory signs as required;
(j) The proposed location and layout for all pavement markings;
(k) The proposed design for all traffic signals, as required; and
(l) All sheets shall be signed and sealed by a professional engineer registered in the State of Kentucky.
(4) Grading, drainage and erosion and sediment control plans.
(a) A complete plan of the proposed development of a scale no less than one-inch equals one hundred feet (1" = 50'). This plan is to include the North American Datum of 1983 (NAD 83) if available. A north arrow shall be shown on the plan. The source and date of the contour should be noted. Contours shall extend to the centerline of all roads bordering the site. Where drainage ultimately enters the groundwater via a sinkhole or drainage well, the drainage well, and the drainage area tributary to the sinkhole or drainage well shall be delineated. Two plan sets should be submitted for initial review.
(b) Omission of any of the below requirements for detailed plans and calculations shall render the application incomplete, and it will be returned to the applicant, or their design engineer, for additional information. In the event of a conflict between these requirements and the City Stormwater Management Ordinance, the latter shall govern. The following shall be included:
1. Any existing or proposed easements.
2. Location of proposed basins showing direction of flow, taking into account offsite runoff being routed through or around the project.
3. Existing buildings on the property.
4. Existing and proposed drainage structures, including inlets, catch basins, junction boxes, drive pipes, culverts, cross drains, headwalls, and outlet facilities, with size, type, slope (top and sides), invert elevations, and quantity indicated.
5. Hydrologic and hydraulic calculations for appropriate design conditions and facilities.
6. Detention pond control structure details. All detention/retention areas require an emergency overflow, unless approved by the City Engineer.
7. Any proposed swale ditches, channel changes, or improvements, with typical section and length of change indicated. If invert elevations are not on the drawing, then depth, slope, and top and bottom width (if varies from typical), or elevations of slopes with flat bottom width.
8. Any high water or flood lines, either calculated or observed in the vicinity of the proposed development, and the source of said line or elevation indicated.
9. All fill areas indicated as such, with the limits and elevations indicated. At least one benchmark located, with the proper elevation indicated for each subdivision.
10. The location and size of at least two drainage structures immediately downstream of all stormwater discharge points from the proposed development including ditch cross-sections. This may be shown on a vicinity map with a scale no less than 1" (one inch) = 2,000' (two thousand feet).
11. Drainage arrows indicating the existing and proposed direction of runoff throughout the development.
12. Invert and top of grade elevations on all catch basins and inlets in addition to flow line elevations, stations, and percent grades of all cross drains and pipe between inlets and catch basins.
13. Floodplain areas require the following information: existing and proposed flood plain and floodway boundaries along with flood plain elevations, and minimum pad and floor elevations for buildings in the floodplain.
14. Temporary erosion and sediment control measures to be implemented during construction shall be shown on a separate sheet.
15. Driveway culvert size chart, depicting each lot number with proposed culvert sizes.
16. Final stabilization measures proposed for all disturbed areas on the property. Areas with slopes 2:1 or greater shall be stabilized with rip rap, sod or by other methods approved by the City Engineer. Show stabilization for each ditch.
17. Where special structures such as box culverts, bridges, or junction boxes are proposed, detail plans showing dimensions, reinforcement, spacing, cross-sections, elevations, and other pertinent information shall be submitted.
18. Plans and engineering calculations shall be signed and sealed by a Kentucky registered engineer.
(Ord. 2022-007, passed 3-14-2022)