“Best management practice (BMP)” is a schedule of activities, prohibition of practices, maintenance procedures, and other management practices to prevent or reduce storm water pollution. BMPs also include treatment requirements, operating procedures, and practices to control facility site runoff, spillage or leaks, sludge or waste disposal, or drainage from raw material storage.

“Clean Water Act” is the Clean Water Act of 1987, formerly referred to as the Federal Water Pollution Control Act.

“Detention” is a system which is designed to capture storm water and release it over a given period of time through an outlet structure at a controlled rate.

“Developed land” shall be all property altered from a natural state by grading, paving, compaction, construction of structures, impervious surfaces, or drainage works so that storm water runoff from the property is changed in quantity, quality, or point of discharge from that which would occur in the natural condition, or so that provision of control and management of storm water runoff from other properties is necessary to prevent property damage and/or personal hazard during storm events.

“Discharger” is any person or entity who directly or indirectly discharges storm water from any property or who directly or indirectly discharges any substance into a storm drainage system.

“Drainage-way” means a course, waterway, conduit, or channel that conveys storm water runoff.

“Equivalent service unit (ESU)” means the average amount of impervious surface, expressed in square feet, on developed single-family residential parcels in Provo City. One (1) ESU is equal to three thousand two hundred (3,200) square feet of impervious surface area.

“Erosion” is the process by which the ground surface is worn away and transported by action of wind, water, ice, gravity, or a combination thereof.

“Hydrologic response” is the manner and means whereby storm water collects, remains, infiltrates, and is conveyed from a property. It is dependent on a number of factors, including but not limited to the presence of impervious area, size, shape, topography, vegetation, surficial geologic conditions, antecedent moisture conditions, and groundwater conditions on each property.

“Illicit connection” is any manmade conveyance connecting an illicit discharge directly into a water body, drainage channel, or a public or private storm drainage system.

“Illicit discharge” is any discharge into a water body, drainage channel, or a public or private drainage system that is not composed entirely of storm water or discharges exempted in Section 18.02.020(2), Provo City Code.

“Impervious surface” means any hard surface, other than an undisturbed natural surface, that prevents or retards the absorption of water into the soil, or that causes water to run off the surface at a rate or quantity greater than that of the natural surface. Common impervious surfaces include, but are not limited to rooftops, sidewalks, walkways, patio areas, driveways, parking lots, and storage areas.

“National Pollutant Discharge Elimination System (NPDES)” is a Federal permitting program, as authorized by Section 402 of the Clean Water Act, to control water pollution by regulating point sources that discharge pollutants.

“Non-single-family residential unit” any developed property not fitting the definition of single-family residential unit contained in this Section shall be deemed and treated as a non-single-family residential unit for the purposes of storm water management service charges. Non-single-family residential units shall include but not be limited to attached townhouses, condominiums, and boarding houses, hotels and motels, houses used primarily for commercial storage areas, public and private schools and universities, churches, hospitals and convalescent centers, office buildings, commercial developments, industrial developments, and municipal facilities.

“Point source” is any discernible, confined, or discrete conveyance, including any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container, concentrated animal feeding operation, or vessel or other floating craft, from which pollutants are or may be discharged; and does not include return flows from irrigated agriculture.

“Pollutant” is any substance which has the potential to impair water quality including, but not limited to the following: solid wastes, vehicle fluids, yard wastes, landscape materials, animal wastes, sediment, sewage, garbage, chemical wastes, biological wastes, soils, rocks, sand, or any other substance defined as a pollutant under the Clean Water Act.

“Private drainage” is all storm water that originates within the boundaries of private property, including, but not limited to, residential, commercial, industrial, or agricultural. It shall retain private classification up to the point where it is discharged to a public storm water facility.

“Retention” is a system which is designed to capture storm water and contain it until it infiltrates into the soil or evaporates.

“Sedimentation” is the gravitational process of deposition of transported solid material from a suspended state in a fluid.

“Single-family residential unit” shall consist of one (1) or more rooms, a bathroom, and kitchen designed for occupancy by one (1) family, and shall include houses, physically separate townhouses or condominiums on individual lots, duplexes having either a single water meter or individual water meters, manufactured housing and mobile homes located on individual lots.

“Storm drainage system” a network of manmade and natural channels, structures, basins, and conduits that collect, convey, treat, and detain or retain storm water runoff.

“Storm water runoff” is the runoff and drainage of precipitation resulting from rainfall, snowfall, or snow/ice melt or other natural events or processes.

Undeveloped Land. Land in an unaltered natural state or which has been modified to such minimal degree as to have a hydrologic condition comparable to land in an unaltered natural state shall be deemed undeveloped for the purposes of applying surface charge that would prevent infiltration or cause storm water to collect, concentrate, or flow in a manner materially different from that which would occur if the land was in an unaltered natural state.

“Utah Pollutant Discharge Elimination System (UPDES)” is a State permitting program authorized by Section 402 of the Clean Water Act to control water pollution, and is comparable to the National Pollutant Discharge Elimination System (NPDES).

“Water body” is any river, lake, stream, creek, or other watercourse wetland that may or may not convey storm water.

“Watershed” is a region that drains to a water body.