(a) The purpose of this chapter is to protect the public health, safety, and general welfare of the residents of the City of Southgate, to prevent flooding and damage to property as a result of uncontrolled storm waters, to improve storm water quality, to reduce erosion and sedimentation and provide for the construction, maintenance, and repair of storm water drainage facilities within the City, which shall be developed in accordance with the applicable requirements and procedures set forth herein.
(b) This chapter shall be applicable to all land development (new development and redevelopment), including but not limited to, site plan, plot plan, and plat applications as well as any grading applications. In addition, this chapter shall be applicable to public improvement projects that disturb one or more acres, including projects less than one acre that are part of a larger common plan for development or sale, and discharged into the city's MS4. The City Engineer may waive the channel protection requirements, water quality requirements, and/or flood control requirements of Section 1048.08 of this chapter for:
(1) Projects that are within areas of the City of Southgate's sewer collection system that are served by combined sewers; or projects that disturb less than one acre and are not part of a larger common plan of development or sale that would disturb one acre or more.
(c) The procedures and standards set forth in this Stormwater Management chapter, and the policies, procedures, and design data specified in the current Wayne County Stormwater Management Program Standards (design manual) provide the minimum standards to be adhered to by developers and in no way limits the authority of the City of Southgate to adopt or publish and/or enforce higher standards as a condition of approval of developments.
(d) No site plan, plot plan, or plat shall be approved until approval by the City Engineer that said development or redevelopment meets all:
(1) Soil erosion and sedimentation control measures consistent with the requirements of Southgate.
(2) Requirements for an approved post-construction stormwater management plan (stormwater plan) as outlined in Section 1048.08 of this chapter; and
(3) Related land development regulations.
(e) In order to ensure completion of construction of the permanent stormwater BMPs specified in the applicant's stormwater plan as outlined in Sections 1048.08 and 1048.09 of this chapter, a completion bond must be provided to the City of Southgate in conjunction with the site plan or plot plan submitted consistent with the City code. The value of the completion bond must be in an amount equivalent to the value of the permanent stormwater BMPs specified in the approved stormwater plan. Consistent with Section 1048.16 of this chapter, the completion bond will be released by the City of Southgate following final verification of the construction by a registered professional engineer in the State of Michigan.
(f) For an existing stormwater basin constructed prior to the effective date of this chapter, an approved stormwater plan must be secured prior to any significant expansion, repair, or maintenance of the said stormwater basin.
(g) This chapter seeks to meet that purpose by minimizing the negative impacts of increased stormwater discharges from new land development and redevelopment through the following objectives:
(1) To minimize increased stormwater runoff rates and volumes from identified land development and redevelopment;
(2) To minimize nonpoint source pollution;
(3) To minimize the deterioration of existing watercourses, culverts and bridges, and other structures;
(4) To encourage water recharge where geologically favorable conditions exist;
(5) To maintain the ecological integrity of stream channels;
(6) To minimize the negative impacts of development on downstream channel stability;
(7) To preserve and protect water supply facilities and water resources by controlling increased flood discharges, stream erosion, and runoff pollution;
(8) To reduce the adverse impact of changing land use on water bodies and, to that end, this chapter establishes minimum standards to protect water bodies from degradation resulting from changing land use where stormwater management controls are insufficient to meet water quantity and quality goals;
(9) To ensure that storm drains and stormwater BMPs are adequate to address stormwater management needs within a proposed development, and for protecting downstream landowners from flooding and degradation of water quality. The procedures, standards, and recommendations set forth in this chapter and the current Wayne County stormwater management policies and procedures manual (policies manual) are designed for these purposes;
(10) To ensure that all stormwater facilities necessary for a proposed development will have an appropriate governmental unit responsible in perpetuity for performing maintenance or; for overseeing the performance of maintenance by a private entity;
(11) To facilitate the integration of stormwater management and pollution control with other ordinances, programs, policies, and the comprehensive plans of the City of Southgate; and
(12) To establish legal authority to carry out all of the inspection and monitoring procedures necessary to ensure compliance with this chapter.
*(Ord. 22-1028. Passed 10-19-22.)