For the purpose of this chapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
APPLICANT. Any person proposing or implementing the development or redevelopment of land.
BMP or BEST MANAGEMENT PRACTICE. Any practice, or combination of practices and design criteria that comply with the current Wayne County Stormwater Control Program, or equivalent practices and design criteria that accomplish the purposes of this chapter (including, but not limited to, minimizing stormwater runoff and preventing the discharge of pollutants into stormwater), as determined by the City Engineer and/or, where appropriate, the standards of Wayne County.
CHANNEL. A natural or artificial watercourse with a definite bed and banks that conducts continuously or periodically flowing water.
CONVEYANCE FACILITY. A storm drain, pipe, swale, or channel.
DESIGN ENGINEER. Registered professional engineer responsible for the design of the stormwater management plan.
DETENTION. A system designed to capture stormwater and release it over a given period of time through an outlet structure at a controlled rate. The goals of this BMP are to control peak discharge rates and provide gravity settling of pollutants.
DEVELOPED or DEVELOPMENT. The installation or construction of impervious surfaces on a development site that require, pursuant to state law or local ordinance, city approval of a site plan, site condominium, special land use, planned unit development, land division, private road, or other approvals required for the development of land or the erection of buildings or structures; provided, however, that, for the purposes of this chapter only, DEVELOPED or DEVELOPMENT shall not include the actual construction of, or an addition, extension, or modification to, an individual single-family or a two-family detached dwelling that disturbs less than one acre.
EGLE. Environment, Great Lakes & Energy, State of Michigan.
ENGINEERED SITE GRADING PLAN. A signed and sealed drawing or plan and accompanying text prepared by a engineer registered in the State of Michigan that shows alterations of topography, alterations of watercourses, flow directions of stormwater runoff, and proposed stormwater management and measures, having as its purpose to ensure that the objectives of this chapter are met.
EROSION AND SEDIMENT CONTROL PLAN. A plan designed to minimize the accelerated erosion and sedimentation runoff at a site during construction.
GRADING. Any stripping, excavating, filling, or stockpiling of soil, or any combination thereof, and the land in its excavated or filled condition.
IMPERVIOUS SURFACE. A surface that does not allow stormwater runoff to slowly percolate into the soil.
INFILTRATION. The percolation of water into the ground, expressed in inches per hour.
LAND DISTURBING ACTIVITY. Any activity that changes the volume or peak flow discharge of rainfall runoff from the land surface. This may include the grading, digging, cutting, scraping, or excavating of soil, placement of fill materials, paving, construction, substantial removal of vegetation, or any activity that bares soil or rock or involves the diversion or piping of any natural or man-made watercourse.
MAINTENANCE AGREEMENT. A binding agreement that establishes the terms, measures, and conditions for the maintenance of stormwater systems and facilities.
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) STORMWATER DISCHARGE PERMIT. The permit issued to the city by EGLE for point source discharges of stormwater from municipal separate storm sewer systems.
NON-STRUCTURAL MEASURE. A stormwater control and treatment technique that uses natural processes, restoration or enhancement of natural systems, or design approaches to control runoff and/or reduce pollutant levels. Such measures are used in lieu of or to supplement structural practices on a land development site.
OFFSITE FACILITY. All or part of a drainage system that is located partially or completely off the development site that it serves.
PEAK RATE OF DISCHARGE. The maximum rate of stormwater flow at a particular location following a storm event, as measured at a given point and time in cubic feet per second (CFS).
PERMANENT STORMWATER BMP. A stormwater best management practice (BMP) that will be operational after the construction phase of a project, and that is designed to become a permanent part of the site for the purposes of managing stormwater runoff.
PLAN. Written narratives, specifications, drawings, sketches, written standards, operating procedures, or any combination of these that contain information pursuant to this chapter.
POST-CONSTRUCTION STORMWATER MANAGEMENT PLAN (STORMWATER PLAN). Drawings and written information prepared by a engineer registered in the State of Michigan that describe the way in which accelerated soil erosion and/or stormwaterflows from a particular site are proposed to be controlled, both during and after construction, having as its purpose to ensure that the objectives of this chapter are met.
RECEIVING STREAM OR CHANNEL. The body of water or conveyance into which stormwater runoff is discharged.
RECHARGE. The replenishment of underground water reserves through percolation.
REDEVELOPMENT. A change to a previously existing, improved property, including but not limited to, the demolition or building of structures, filling, grading, paving, or excavating, but excluding ordinary maintenance activities, remodeling of buildings that involves demolition or changes to the exterior site footprint, resurfacing of paved areas, and exterior changes or improvements that do not materially increase or concentrate stormwater runoff or cause additional nonpoint source pollution.
RESPONSIBLE PARTY. Any individual, partnership, co-partnership, firm, company, corporation, association, joint-stock company, trust, estate, governmental entity, or any other legal entity; or their representatives, agents, or assigns that is named on a stormwater maintenance agreement as responsible for long-term operation and maintenance of one or more stormwater BMPs.
RETENTION. A holding system for stormwater, either natural or man-made, that does not have a direct outlet to adjoining watercourses or wetlands.
RUNOFF. That part of precipitation that flows over the land.
SEDIMENT. Mineral or organic particulate matter that has been removed from its site of origin by the processes of soil erosion, is in suspension in water, or is being transported.
STORMWATER BMP. Any facility, structure, channel, area, process or measure that serves to control stormwater runoff in accordance with the purposes and standards of this chapter.
STORMWATER MANAGEMENT DESIGN MANUAL. The current Wayne County standards document that provides a detailed explanation of the design criteria and specific constructed approaches for achieving compliance with the this chapter.
STREAM BUFFER. An area of land at or near a streambank, wetland, or waterbody that has intrinsic water quality value due to the ecological and biological processes it performs, or is otherwise sensitive to changes that may otherwise result in significant degradation to water quality.
WATERCOURSE. Any natural or man-made waterway or other body of water having reasonably well-defined banks, rivers, streams, creeks, brooks, and channels, whether continually or intermittently flowing, as well as lakes and ponds.
WATERSHED. An area of land draining to a common outlet otherwise known as a drainage or catchment area.
WETLANDS. As defined by Michigan’s Wetlands Statute, Part 303, Wetlands Protection, of the Natural Resources and Environmental Protection Act, 1994 PA 451, as amended.
(Ord. 22-002, passed 4-11-22)