Loading...
GENERAL PROVISIONS
§ 160.10 PURPOSE.
   The purpose of this chapter is to reduce or eliminate the hazards to public health and safety cause by excessive stormwater runoff, reduce economic losses to individuals and the community at large, and protect conserve and promote the orderly development of land and water resources. The provisions of this chapter further supplement ordinances regulating:
   (A)   The subdivision, layout and improvement of lands located within the corporate limits of the city.
   (B)   The excavation, filling and grading of lots and other parcels or areas.
   (C)   The construction of buildings and the drainage of the sites on which these structures are located, to include parking and other paved areas.
   (D)   The design, construction and maintenance of stormwater drainage facilities and systems.
(Ord. 2809, passed 12-10-2012)
§ 160.11 INTERPRETATION.
   In the interpretation and application of this chapter, the provisions expressed herein shall be held to the minimum requirements and shall be liberally construed in favor of the city and shall not be deemed a limitation or repeal of any other powers granted by state statutes.
(Ord. 2809, passed 12-10-2012)
§ 160.12 DEFINITIONS.
   For the purpose of this chapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
   BANKFUL ELEVATION. It is the water level, or stage at which the stream, river or lake is at the top of its banks and any further rise would result in water moving into the floodplain.
   BEST MANAGEMENT PRACTICES (BMP). They are a schedule of activities prohibitions of practices, maintenance procedures and other management practices, which are proved to be effective in preventing or reducing runoff, erosion and sedimentation.
   DETENTION FACILITY. Any structure which is designed to collect and store surface water for subsequent gradual discharge.
   DRAINAGE FACILITY. Any component of the drainage system.
   EXCESS STORMWATER RUNOFF. That portion of stormwater which exceeds the safe storm drainage capacity of storm sewers or natural drainage channels serving a specific watershed.
   IMPERVIOUS AREAS. The horizontal-projected plain area of roof and paved areas of all permanently constructed roofs of houses, garages, mobile homes, businesses, industries, paved driveways, patios and parking lots, but does not include non-permanent structures such as temporary buildings and tents. Also excluded are impervious areas of stored materials and equipment, swimming pools, ponds and lakes; and stormwater retention and detention basins. Gravel or rock roads and gravel or rock parking areas are not considered as impervious areas.
   PROTECTED CHANNEL. A channel which receives stormwater discharge and which is paved, rip-rapped, or otherwise improved by addition of man-made materials so as to reduce the potential for erosion.
   SAFE STORM DRAINAGE CAPACITY. The quantity of stormwater runoff that can be transported by a channel or conduit without giving the water surface rise above the top of the channel and conduit.
   STORMWATER CHANNEL. A natural or man-made open watercourse with definite bed and banks which periodically or continuously contains moving water, or which forms a connecting link between two bodies of water.
   STORMWATER RUNOFF. Water that results from precipitation, which is not absorbed by the soil or vegetation or evaporated, and which flows over the ground surface or is collected in channels or conduits.
   STORMWATER RUNOFF RELEASE RATE. The rate at which stormwater runoff is released from dominant to servient land.
   TWENTY-FIVE-YEAR, 24-HOUR FREQUENCY RAINFALL. A precipitation event of 24-hours duration, having a 4% chance of occurring in any one year.
   COMPLIANCE WITH OTHER REQUIREMENTS. Before starting any activities regulated by this chapter, an applicant shall comply with the requirements set forth in other applicable ordinances with respect to the submission and approval of preliminary and final subdivision plats, improvement plans, building and zoning permits, inspections, appeals and similar matters, along with those set forth in this chapter and as may be required by state statutes and the regulations of any department of the Commonwealth of Kentucky.
   STORMWATER MANAGEMENT PLAN.
      (1)   A stormwater management plan shall be required for any new single-family residential development having a gross aggregate area, including roads, utility rights-of-way, and any other dedicated land of five or more acres, and having a density of greater than one dwelling unit per acre or for any new commercial, multi-family residential, industrial, institutional or utility development having a gross aggregate area of 0.5 acres or more. A plan shall also be required for any new development or redevelopment of fully developed areas as designated on the watershed drainage map. The official watershed drainage map shall be kept in the office of the Stormwater Manager. No final subdivision plat shall be approved and no building permits shall be issued until and unless the stormwater management plan has be reviewed and approved by the Stormwater Manager. Owners of residential property within subdivisions for which final subdivision plats have approved prior to the date of the approval of this chapter shall not be required to comply with this chapter. The Stormwater Manager may also require stormwater management plans for any drainage area if adverse impacts are anticipated. A stormwater management plan may also be required prior to any grading or excavation which would fill, obstruct or otherwise alter any creek, stormwater channel or drainage facility.
      (2)   The required Stormwater Management Plan shall identify means for controlling the stormwater runoff release rate from the development and providing storage potential for the excess stormwater runoff (where required). All computations, plans and specifications related to the implementation of this chapter must be prepared and sealed by a professional engineer registered in the state.
(Ord. 2809, passed 12-10-2012)
REQUIREMENTS AND STANDARDS
§ 160.20 REQUIREMENT FOR CONTROLS OF RUNOFF FROM PROJECTS UNDER CONSTRUCTION/NEW CONSTRUCTION.
   (A)   The following Best Management Practices which address the problem of urban runoff shall apply to all projects undergoing construction in the city. The Best Management Practices list set forth below is required by the city. The requirements set forth below shall apply at the time of demolition of an existing structure or commencement of construction and until receipt of a certificate of occupancy:
      (1)   Runoff sediment and construction waste from construction sites and parking areas shall not leave the site;
      (2)   Any sediments or other materials which are tracked off the site shall be removed the same day as they are tracked off the site. Where determined by the Stormwater Manager or his or her designated representative, a temporary sediment barrier shall be installed;
      (3)   On an emergency basis only, plastic covering may be utilized to prevent erosion of an otherwise unprotected area, along with runoff devices to intercept and safely convey the runoff;
      (4)   Excavated soil shall be located on the site in a manner that eliminates the possibility of sediments running into the street or adjoining properties. Soil piles shall be covered until the soil is either used or removed. A plastic or micro-mesh fabric should be used;
      (5)   No washing of construction or other industrial vehicles shall be allowed adjacent to a construction site. No runoff from wash vehicles on a construction site is allowed to leave the site;
      (6)   Drainage controls shall be utilized as needed, depending on the extent of proposed grading and topography of the site, including but not limited to the following:
         (a)   Detention ponds, sediment ponds or infiltration pits;
         (b)   Dikes, filter berms, silt fences or ditches;
         (c)   Down drains, chutes or flumes.
   (B)   Observe basic principles such as:
      (1)   Preserve existing vegetation as much as possible;
      (2)   Mulch or seed bare soil immediately for the best and cheapest erosion protection;
      (3)   Use silt fences, brush barriers, or other approaches to pond and filter sediment from runoff;
      (4)   Install silt check dams made of rock, brush or other products to prevent ditch erosion and remove sediment;
      (5)   Protect inlets and outlets; and
      (6)   Settle out soil particles in sediment traps and basins.
   (C)   The Stormwater Management Plan shall contain, but not be limited to, the following information unless specifically excluded by the Stormwater Manager.
      (1)   A topographic map of the project site and adjacent areas, of suitable scale and contour interval, which shall define the location of streams, the extent of flood plains and calculated high water elevations, the shoreline of lakes, ponds, swamps and detention basins including their inflow and outflow structures, if any.
      (2)   The location and flow line elevation of all existing sanitary, storm or combined sewers.
      (3)   Detailed determination of runoff anticipated for the entire project site following development indicating design volumes and rates of proposed runoff for each portion of the watershed tributary to the storm drainage system, the calculations used to determine said runoff volumes and rates and restatement of the criteria which have been used by the project engineer throughout calculations.
      (4)   A layout of the proposed stormwater management system including the location and size of all drainage structures, storm sewers, channels and channel sections, detention basins, and analyses regarding the effect said improvements will have upon the receiving channel and its high water elevation.
      (5)   The slope, type, and size of all existing and proposed storm sewers and other waterways impacting or impacted by the proposed development on the site.
      (6)   For all detention basins, a plot of tabulation of storage volumes with corresponding water surface elevations and of the basin outflow rates for those water surface elevations
      (7)   For all detention basins, design hydrographs of inflow and outflow for the 25 year, 24-hour events for the site under existing and developed conditions.
      (8)   A profile and one or more cross sections of all existing and proposed channels or other open drainage facilities, showing existing conditions and the proposed changes thereto, conditions called for by these regulations and the relationship of structures, streets and other utilities to such channels.
(Ord. 2803, passed 12-10-2012) Penalty, see § 160.99
Loading...