(A) This chapter has been prepared as a collaborative effort by the Isabella County Drain Commissioner’s office and the municipal entities of the Charter Township of Union, Chippewa Township, and the City of Mt. Pleasant.
(B) The purpose of this chapter is to establish general compliance requirements for storm water management practices. This chapter establishes the framework through which detention and/or retention measures will be implemented and details the process that must be followed to gain approval for new developments and redevelopment drainage systems and maintenance of storm water systems. Except as provided in § 54.03, the standards, procedures, and permitting requirements set forth in this chapter apply only to development and redevelopment projects (as defined below), and not to projects involving the construction of one-family or two-family dwellings, or to projects involving additions, extensions, or modifications to such dwellings or the parcels on which they are located.
(C) The purpose of this chapter is to accomplish, among others, the following objectives:
(1) Reduce artificially induced flood damage;
(2) Minimize increased storm water runoff rates and volumes from identified new land development;
(3) Minimize the deterioration of existing watercourses, culverts and bridges, and other structures;
(4) Encourage water recharge into the ground where geologically favorable conditions exist;
(5) Reduce non-point source pollution;
(6) Maintain the integrity of stream channels for their biological functions, as well as for drainage and other purposes;
(7) Minimize the impact of development upon stream bank and streambed stability;
(8) Reduce erosion from development or construction projects;
(9) Preserve and protect water supply facilities and water resources by means of controlling increased flood discharges, stream erosion, and runoff pollution;
(10) Reduce storm water runoff rates and volumes, soil erosion, and non-point source pollution, wherever practicable, from lands that were developed without storm water management controls meeting the purposes and standards of this chapter; and
(11) 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 there are insufficient storm water management controls.
(D) This chapter covers the following topics:
(1) A summary of the procedures to be followed under this chapter, including requirements, review procedures, inspection requirements and other agency requirements;
(2) A description of design requirements and engineering calculations; and
(3) A description of minimum design criteria and rules to be followed for design of new drainage systems, and the maintenance of those systems.
(Ord. 992. Passed 1-12-15)