01-08-2018 Council Meeting Packet

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§ 1011.011 STORMWATER MANAGEMENT REQUIREMENTS. (1) Stormwater management. A permit incorporating an approved stormwater management plan shall be required for all proposed land development activity including public linear projects, unless otherwise exempted in this chapter, which meets any or all of the following: (a) A development, redevelopment or reconstruction, except public linear projects, that creates or reconstructs 10,000 square feet or more of impervious surface, including smaller individual sites that are part of a common plan of development that may be constructed at different times. (b) A subdivision of an area exceeding one acre. This includes subdivision for single-family residential, multi-unit residential, commercial, industrial, or institutional development. (c) For public linear projects, a permit is required to create or reconstruct 10,000 square feet or more of impervious surface through multiple phases or connected actions of a single project, as defined by the city. (d) The site is within the 100-year floodplain; within 1,000 feet of a public water or protected wetland; impacts a wetland; and/or within 300 feet of Rice Creek, Clearwater Creek, Hardwood Creek, or a public ditch. (e) Any land disturbing activity, regardless of size, that the city determines would otherwise cause an adverse impact to an environmentally sensitive area or other property. (f) Stormwater management requirements do not apply to development of an individual lot within a residential subdivision if it conforms to an approved development plan. (g) Stormwater management requirements do not apply to sidewalks and trails ten feet wide or less that are bordered down-gradient by vegetated open space or vegetated filter strip with a minimum width of five feet, however the grading, erosion and sediment control requirements are still effective. (h) Stormwater management requirements do not apply to mill, reclamation and overlay projects that do not expose underlying soils. (i) Stormwater Management Requirements do not apply to bridge span projects, however grading, erosion and sediment control requirements are still effective. (2) Stormwater management performance standards. Site plans for new development of any kind will be assessed for stormwater quantity control and stormwater quality management. The general policy on stormwater runoff rates is to reduce the impacts of development by maintaining predevelopment hydrological conditions in the following ways: (a) Use of natural topography. The applicant shall incorporate the use of natural topography and land cover such as natural swales and depressions as they exist before development to the degree that they can accommodate the additional flow of water without compromising the integrity or quality of the receiving waterbody. (b) Minimize impact to natural features. The development shall minimize impact to significant natural features. Applicant shall review the site for natural features protected under city, state or Federal requirements, including steep slopes, wetlands, wooded areas, endangered or threatened species, or species of concern habitat, areas designated by the county biological survey, greenways, parks and open space, groundwater recharge areas, wellhead or surface water protection areas or regional stormwater pond locations. (c) Conveyance system. Wherever possible untreated and treated stormwater runoff shall be conveyed in facilities open to the atmosphere (e.g. swales, vegetated buffer strips, energy-dissipating structures, and the like) rather than through enclosed pipes, so as to decrease runoff velocity, allow for natural infiltration, allow suspended sediment particles to settle, and to remove pollutants.