(A) All development plans shall be designed with the following criteria in regards to storm water management.
(1) The developer is responsible for all surface and sub-surface drainage of the proposed development. The developer shall provide for such drainage in a manner as to properly relieve storm waters from the development without obstructing existing drainage patterns or increasing runoff onto adjacent properties, including city maintained right-of-way.
(2) In any case where post development storm water runoff is determined by the developer’s engineer to exceed pre-development runoff on-site detention, either by means of drainage structures, underground detention or a detention basin, will be required.
(a) All development plans and grading plans required by § 152.16(A)(2) shall have both pre-development and post-development storm water runoff calculations clearly indicated on the plans.
(b) All drainage structures and facilities (pipes, culverts, drop boxes, ditches and the like) shall be designed to accommodate 100 year rain event.
(c) Detention basins shall be designed by a professional engineer licensed in the State of Kentucky. Design calculations for detention basins shall be provided to the Joint City-County Planning Commission.
(1). The detention facilities shall be of sufficient height to provide necessary water detention. It shall consist of an inlet structure, low flow pipe, emergency spillway and energy dissipater if required to control discharge.
(2). Side slopes shall not exceed maximum slope of three foot horizontal to one foot vertical (3:1) on the upstream side of the dam if it is to have a grass covering or a maximum slope of two
foot horizontal to one foot vertical (2:1) if it is to be rock. The downstream side of the dam shall have a maximum slope of three foot horizontal to one foot vertical (3:1).
(3). A standard concrete headwall to disperse the water flow from an outlet structure will be sufficient if outlet velocities do not exceed four feet per second.
(4). Energy dissipaters will be required for all outlet structures where outlet velocity exceeds four feet per second to protect the downstream channel from eroding. Reference the adopted Best Management Practices Manual for additional erosion control requirements regarding detention basins.
(5). No overtopping of the emergency spillway is to occur and detention facilities are to be designed in such a way as to prevent it.
(6). Refer to Article 1004.1 of the subdivision regulations for additional detention basin requirements.
(d) In the event that pre-development and post development calculations provided by the developer’s engineer are found to be inaccurate any time after approval of the final development plan, the developing property owner shall be held liable for any and all damages incurred and corrective measures to be initiated.
(e) The developing property owner shall be held liable for any and all failures of drainage structures, underground detention or detention basins resulting from any on-site occurrences resulting from design flaws of the development plans.
(f) In the event that drainage structures, underground detention or detention basins fail due to improper installation, the developing property owner shall be held liable for any and all damages incurred and corrective measures to be initiated.
(g) In the event that any drainage structure or facility fails, the city shall not be held responsible for any damages to adjacent properties relating to the site at which the drainage structure or facility fails.
(h) Refer to Article 1004.2 of the subdivision regulations for specifications regarding drainage ditch design.
(i) A means of access (easement or access ways) shall be provided to all proposed storm water facilities for maintenance. Any and all easements to be maintained (mowed, cleared of debris, standard up-keep) by the current property owner.
(j) Maintenance (mowing, clearing of debris, standard up-keep) of drainage structures or facilities is the sole responsibility of the current property owners. However, in any case where events such as those mentioned in § 152.20(A)(2)(d), (e) and (f) occur, the developing property owner shall be held liable for any corrective actions.
(k) If downstream or bordering drainage facilities on off-site properties are found to be inadequate due to onside drainage improvements off-site improvements may be required.
(l) Strict conformance to these regulations does not relinquish the developer/property owner from liability concerning any damages to adjacent property owners, including city maintained right-of-way that may occur.
(m) In the event that the Joint City-County Planning Commission or the Superintendent of the Street Department present logical findings for not having detention (soil conditions, excessive slopes and the like), the runoff detention requirement may be waived.
(B) All development plans shall be prepared on Mylar or other material capable of clear reproduction using Ozalid print process. Plans shall be legible and of a size and scale (generally not exceeding one inch = 100 feet) which enables clear presentation of required information.
(C) Required plan information shall be as follows:
(1) Contents of preliminary development plan. A preliminary development plan shall contain the following information at a minimum:
(a) A title block containing the plan name, development plan type (preliminary or final), name and address of developer and plan preparer and a written and graphic scale;
(b) The boundary of the subject property, acreage or square footage of development, easements and setbacks, and the zoning and owner names for all adjoining property;
(c) Vicinity sketch, oriented in the same direction as the design scheme;
(d) Topography with one foot or two foot contour intervals, or spot elevations of sufficient detail to generally describe the lay of the land;
(e) Location, arrangement, and approximate dimensions of existing and proposed driveways, walkways, parking areas and arrangement of spaces, dumpster pads, points of ingress and egress and other vehicular and pedestrian right-of-way;
(f) Location, profiles and cross sections of any proposed or existing streets or deceleration lanes, when deemed necessary by the Joint City-County Planning Commission or Superintendent of the Street Department, within or abutting the subject property;
(g) Screening, landscaping (as required by § 158.029 of the city’s zoning ordinance), recreational and other open spaces;
(h) Approximate size, location, height, floor area, area arrangement and use of proposed and existing buildings and signs;
(i) Location of proposed lot lines for projects anticipated to involve land subdivision;
(j) Storm drainage areas, floodplains, conceptual drainage controls and storm water retention, as required by division (A) above, and any other designated environmentally sensitive or geologic hazard areas;
(k) The plan must show and/or describe direction of all storm water runoff;
(l) Type and location of all existing and proposed drainage structures and facilities, constructed or natural;
(m) Existing and proposed finished floor elevations (FFE);
(n) Scale, north arrow and benchmark tied to USGS;
(o) Location of all FEMA flood hazard areas;
(p) Summary table for all pipe and ditch calculations;
(q) Erosion control plan that meets the guidelines required by the adopted Best Management Practices Manual;
(r) Proposed and existing easements for utilities or other purposes, locations of sanitary sewers including lengths and alignments of laterals;
(s) Areas of substantial existing trees including those located along fencerows and drainage areas, along with a general description of the type and size of the trees;
(t) A statistical table summarizing all pertinent site data, including site area, zoning, building coverage and floor area, parking, open space, pre-development storm water runoff and post-development storm water runoff and the like;
(u) For projects of one acre or more in area: A note stating that no grading, stripping, excavation, filling or other disturbance of the natural ground cover shall take place unless and until the Joint City-County Planning Commission or city’s Superintendent of Public Works has approved the developer’s proposed soil erosion control procedures and, if required, a soil erosion control plan;
(v) A note stating that no building permits shall be issued unless and until a final development plan is approved by the Joint City-County Planning Commission;
(w) An owner’s certification, signed and witnessed as follows: “I (We) do hereby certify that I am (we are) the only owner(s) of the property shown hereon, and do adopt this as my (our) development plan for the property.”; and
(x) A Joint City-County Planning Commission certification to be signed by the Joint City-County Planning Commission Chair and Secretary if and when the plan is fully approved, as follows: “We do hereby certify that this development plan was approved by the Joint City-County Planning Commission at its meeting held on (date).” In the absence of this note, the approved minutes of the Joint City-County Planning Commission will be sufficient.
(2) Contents of final development plan. A final development plan shall contain all information as required for preliminary development plans under the sections above, except that the plan information shall be of an exact nature, rather than approximate or general.
(1989 Code, § 152.20) (Ord. 1975, passed 9-28-1992; Am. Ord. 2026, passed 8-23-1993; Am. Ord. 2667, passed 7-13-2009)