For the purpose of this chapter, the following definitions shall apply:
“BOARD.” The Drainage Board, Board of Works, or Town Board having jurisdiction over the land area being developed.
“BOARD OF WORKS.” The Board of Public Works and Safety in either city identified in this section and any subordinate employee to whom they shall specifically designate a responsibility authorized by this chapter. The Board of Works shall have jurisdiction within the city, contiguous to the city, or within a two-mile radius of the existing corporation limits and within the limits of this chapter.
“CAPACITY (OF A STORM DRAINAGE FACILITY).” The maximum flow that can be conveyed or stored by a storm water drainage system or structure without causing damage to the system or properties in the area adjacent to the site. Also, the maximum design flow or storage ability of a given engineered structure.
“CHANNEL.” A natural or artificial watercourse which periodically or continuously contains moving water, or which forms a connecting link between two bodies of water. It has a defined bed and banks, which serve to confine and direct the flow of water.
“CITY.” The City of Union City, Indiana, or Winchester, Indiana.
“COMMERCIAL LAND USE.” Use of land for the manufacturing, wholesale distribution, warehousing, or retail sale of goods or services.
“COMPENSATORY STORAGE.” An artificial volume of storage within a floodplain used to balance the loss of natural flood storage capacity when artificial fill or structures are placed within the floodplain.
“CONDUIT.” A pipe, storm sewer, subsurface tile drain, manhole, inlet, or other type of drainage structure used to convey the flow of water within a drainage system.
“CONTIGUOUS.” Adjoining or in actual contact with.
“CRITICAL DURATION STORM” That storm duration that requires the greatest detention storage.
“CULVERT.” A closed conduit used for the passage of surface drainage water under a street, roadway, railroad, canal, or other impediment.
“CUT.” The material removed in excavation. Also, the difference between a point on the original ground surface and a designated point of lower elevation on the final grade.
“DETENTION BASIN.” A facility constructed or modified to restrict the flow of storm water to a prescribed maximum rate, and to detain concurrently the excess waters that accumulate behind the outlet.
“DETENTION STORAGE.” The temporary detaining or storage of storm water in storage basins, lakes, in streets, parking lots, school yards, parks, open spaces, or other areas under predetermined and controlled conditions, with the rate of drainage therefrom regulated by appropriately installed devices.
“DRAINAGE AREA.” The surface area, usually measured in acres or square miles, from which water is carried off by a drainage system; a watershed or catchment area.
“DRAINAGE BOARD.” The Drainage Board of Randolph County, and any elected or appointed official to whom it shall specifically delegate the responsibilities authorized by this chapter.
“DRAINAGE SYSTEM.” The network of subsurface drainage tiles, pipes, culverts, swales, open ditches, ravines, manholes, inlets, streams, rivers, ponds and lakes which carry, store, or enhance the flow and storage of surface or subsurface drainage.
“DROP MANHOLE.” A manhole having a vertical drop pipe connecting the inlet pipe to the outlet pipe. The vertical drop pipe shall be located immediately outside the manhole.
“DRY BOTTOM DETENTION BASIN.” A storage area designed to be completely drained after having provided its planned detention of runoff during a storm event.
“DURATION.” The time period of a rainfall event.
“EROSION.” Wearing away of the land by running water, waves, temperature changes, ice or wind.
“EROSION CONTROL MEASURE.” A practice or a combination of practices to control erosion and resulting sedimentation.
“EROSION CONTROL PLAN.” A written document of pertinent information concerning erosion control measures designed to meet the requirements of this chapter and submitted by the applicant for review and approval in compliance with applicable laws and ordinances.
“EXCAVATION.” Any act by which earth, sand, gravel, rock or other similar material is dug into, cut, quarried, uncovered, removed, displaced, relocated, or bulldozed, and shall include the conditions resulting therefrom.
“FILL.” Any act by which earth, sand, gravel, rock or any other clean material is placed, pushed, dumped, pulled, transported, or moved to a new location above the natural surface of the ground or on top of the stripped surface, and shall include the conditions resulting therefrom. Also, the difference in elevation between a point on the original ground surface and a designated point of higher elevation on the final grade, Also, the material used to make a fill.
“FLOOD or FLOOD WATERS.” The water of any watercourse that is above the banks of the watercourse. It also means the water of any lake that is above and outside the banks thereof.
“FLOOD ELEVATION.” The elevation that represents the maximum level of high waters for a flood of given return period and rainfall duration.
“FLOOD HAZARD AREA.” Any floodplain, floodway, floodway fringe, or any combination thereof which is subject to inundation by the peak discharge from a 100-year frequency flood event; or any floodplain as delineated by Zone A on a Flood Hazard Boundary Map.
“FLOOD PROTECTION GRADE.” The elevation above Mean Sea Level at which the lowest floor of any building should be located to protect against flood damage from a 100-year frequency rainfall event. If a basement is included, the basement floor is considered the lowest floor.
“FLOODPLAIN.” The area adjacent to a river, stream or ditch that is subject to inundation by flood waters, including the floodway fringe and the regulatory floodway.
“FLOODWAY.” The channel of a river or stream and those portions of the floodplains adjoining the channel which are reasonably required to carry and discharge the peak flow of the 100-year frequency rainfall event.
“FLOODWAY FRINGE.” That portion of the floodplain lying outside the floodway, which is inundated by the 100-year flood.
“FOOTING DRAIN.” A subsurface tile drainpipe installed around the exterior of a basement wall or a crawl space foundation to relieve water pressure and prevent groundwater from entering a basement or crawl space.
“GRADE.” The inclination or slope of a channel, canal, conduit, and the like, or natural ground surface usually expressed in terms of the percentage the vertical rise (or fall) bears to the corresponding horizontal distance.
“IDNR.” The Indiana Department of Natural Resources.
“IMPACT AREAS.” - Areas defined and mapped by the Drainage Board which are unlikely to be easily drained because of one or more factors including but not limited to any of the following: soil type, topography, land where there is not adequate outlet, a floodway or floodplain, land within 75 feet of each bank of any regulated drain, or within 75 feet from the centerline of any regulated tile ditch.
“IMPERVIOUS.” A term applied to material through which water cannot pass, or through which water passes with difficulty.
“IMPROVEMENT LOCATION PERMIT.” A permit stating that the proposed erection, construction, enlargement or moving of a building or structure complies with the provisions of the appropriate Zoning Ordinance.
“INLET.” An opening into a storm sewer system for the entrance of surface storm water runoff, more completely described as a storm sewer inlet.
“INSTITUTIONAL.” An established organization or corporation, especially of a public character, including medical facilities, schools and churches.
“JUNCTION CHAMBER.” A converging section of conduit, usually large enough for a person to enter, used to facilitate the flow from one or more conduits into a main conduit.
“LAND DISTURBING ACTIVITY.” Any man-made change of the land surface or subsurface, including removing vegetative cover, excavating, filling, transporting, and grading. In the context of this chapter, it includes only nonagricultural land disturbing activities on sites that also require a local improvement location permit or an approved subdivision plat.
“LATERAL STORM SEWER.” A sewer that has inlets connected to it but has no other storm sewer connected.
“MAJOR DRAINAGE SYSTEM.” Drainage system carrying runoff from an area of one or more square miles.
“MAJOR SUBDIVISION.” All subdivisions, not classified as minor subdivisions, including but not limited to, subdivisions of four or more lots, or any size subdivision requiring any new street, or extension of local government facilities, or the creation of any public improvements.
“MANHOLE.” Storm sewer structure through which a person may enter to gain access to an underground storm sewer or enclosed structure.
“MINOR DRAINAGE SYSTEMS.” Drainage systems having an area of less than one square mile.
“MINOR SUBDIVISION.” Defined as any subdivision which:
(1) Contains no more than three lots;
(2) Has all lots fronting on an existing street;
(3) Does not involve the construction of a new street or extension of an existing street;
(4) Does not necessitate the extension of municipal facilities or the creation of any public improvements; and,
(5) Does not adversely affect the remainder of the parcel or adjoining property.
“OFF-SITE.” Everything not on-site.
“ON-SITE.” Located within the controlled area where runoff originates.
“OUTFALL.” The point or location where storm runoff discharges from a sewer or drain. Also applies to the outfall sewer or channel that carries the storm runoff to the point of outfall.
“PEAK FLOW.” The maximum rate of flow of water at a given point in a channel or conduit resulting from a particular storm or flood.
“PERIMETER DRAIN.” A subsurface tile drain located around and below the perimeter of septic system absorption field in compliance with regulations established by county ordinance and administered by the County Health Department.
“PRIVATE DRAIN.” A storm sewer, subsurface tile drain, open ditch, grassed waterway or drainage structure that is located on land owned by one or more landowners, and which was not established under the Indiana Code as a regulated drain, or which is not under the maintenance jurisdiction of the County Drainage Board and County Surveyor.
“RADIUS OF CURVATURE.” Length of radius of a circle used to define a curve.
“RAINFALL INTENSITY.” The cumulative depth of rainfall occurring over a given duration, normally expressed in inches per hour.
“REACH.” Any length of river, channel or storm sewer.
“REGULATED AREA.” All of the land under the jurisdiction of the County Drainage Board, Board of Works, or Town Board as defined herein that has adopted this ordinance.
“REGULATED DRAIN.” Any open ditch or subsurface tile drain that has been accepted and is under the jurisdiction of the Drainage Board in accordance with the 1965 Drainage Act and its amendments (IC 36-9-27).
“REGULATED DRAIN EASEMENT.” A legally enforceable access strip of land measured at right angles 75 feet from the top of each bank of an open drainage way, the centerline of a buried tile drain, or storm sewer determined to be a regulated rural or urban drain by the County Drainage Board and verified through records located in the County Surveyor's Office. Regulated drain easements in platted subdivision urban drains may be less than 75 feet wide if so approved by the Drainage Board.
“REGULATORY FLOOD.” A flood with a peak having a probability of occurrence of 1% in any given year, which is commonly referred to as a 100-year flood as calculated by a method and procedure that is acceptable to the Drainage Board. If a permit for construction in a floodway is required by the IDNR, the regulatory peak discharge shall be calculated by the method and procedure acceptable to the Drainage Board and the IDNR.
“RELEASE RATE.” - The amount of storm water release from a storm water control facility per unit of time.
“RETURN PERIOD.” The average interval of time within which a given rainfall event will be equaled or exceeded once. A flood having a return period of 100 years has a 1% probability of being equaled or exceeded in any one year.
“RUNOFF.” The water derived from rains falling within a tributary basin, flowing over the surface of the ground, or collected in channels or conduits.
“RUNOFF COEFFICIENT.” A decimal fraction relating the amount of rain which appears as runoff and reaches the storm drainage system to the total amount of rain falling. A coefficient of 0.5 implies that 50% of the rain falling on a given surface appears as storm water runoff.
“SEDIMENT.” Material of soil and rock origin, transported, carried or deposited by water.
“SIPHON.” A closed conduit or portion of which lies above the hydraulic grade line, resulting in a pressure less than atmospheric and requiring a vacuum within the conduit to start flow. A siphon utilizes atmospheric pressure to effect or increase the flow of water through a conduit. An inverted siphon is used to carry storm water flow under an obstruction such as a sanitary sewer.
“SITE.” The entire area included in the legal description of the land upon which land disturbing activities have been proposed in an improvement location permit or subdivision application.
“SLOPE.” The face of an embankment or cut section; any ground whose surface makes an angle with the plane of the horizon. Slopes are usually expressed in a percentage based upon vertical difference in feet per 100 feet of horizontal distance.
“SOIL SURVEY.” A study conducted by the Natural Resources Conservation Service (formerly Soil Conservation Service) in which maps of each legal land section of the county have been prepared detailing the types of soil that can be found on land in various parts of the county.
“SPILLWAY.” A waterway in or about a hydraulic structure, for the escape of excess water.
“STILLING BASIN.” A basin used to slow water down or dissipate its energy.
“STORAGE DURATION.” The length of time that water may be stored in any storm water control facility, computed from the time water first begins to be stored in the system.
“STORM SEWER.” A closed conduit for conveying collected storm water.
“STORM WATER DRAINAGE SYSTEM.” All means, natural or man-made, used for conducting storm water to, through or from a drainage area to any of the following: conduits and appurtenant features, canals, channels, ditches, streams, culverts, streets and pumping stations.
“SUBSURFACE TILE DRAIN.” A plastic, concrete, asbestos concrete, or clay tile drain placed under a street curb, around the perimeter of a septic system absorption field, or attached to foundation drains, which serves as a drainage outlet and reduces the level of the groundwater table in adjacent soils.
“SWALE.” A grassy or paved structure used to convey concentrated surface water runoff from its source to a storm sewer, conduit, channel, or other natural drainage outlet.
“TOWN.” Town shall mean the town of Farmland, Losantville, Lynn, Modoc, Parker City, Ridgeville, or Saratoga, all in Indiana.
“TOWN BOARD.” The Board of Trustees in any of the towns defined in this section and any subordinate employee to whom they shall specifically designate a responsibility authorized by this chapter. The Town Board shall have jurisdiction within the corporate limits of the town.
“TRIBUTARY.” Contributing storm water from upstream land areas.
“URBANIZATION.” The development, change or improvement of any parcel of land consisting of one or more lots for residential, commercial, industrial, institutional, recreational or public utility purposes.
“WATERCOURSE.” Any river, stream, creek, brook, branch, natural or man-made drainageway in or into which storm water runoff or floodwaters flow either regularly or intermittently.
“WATERSHED.” See Drainage Area.
“WET BOTTOM DETENTION BASIN (RETENTION BASIN).” A basin designed to retain a permanent pool of water after having provided its planned detention of runoff during a storm event.
(Ord. 00-22, passed 12-28-00; Am. Ord. 2001-17, passed 1-14-02)