(A) Purpose.
(1) Land development projects and associated increases in impervious cover alter the hydrologic response of local watersheds and increase stormwater runoff rates and volumes, flooding, stream channel erosion and sediment transport and deposition; this stormwater runoff contributes to increased quantities of water-borne pollutants and; stormwater runoff, soil erosion and nonpoint source pollution can be controlled and minimized through the regulation of stormwater runoff from development sites.
(2) The purpose of this chapter is to establish minimum post stormwater management requirements and controls to protect and safeguard the general health, safety and welfare of the public residing in watersheds within this jurisdiction. The goal is to maintain or improve the quality of all streams within the MS4 boundaries to meet their designated use. This chapter seeks to meet that purpose through the following objectives:
(a) Minimize increases in stormwater runoff from any development in order to reduce flooding, siltation and stream bank erosion and maintain the integrity of stream channels;
(b) Minimize increases in nonpoint source pollution cause by stormwater runoff from development which would otherwise degrade local water quality;
(c) Minimize the total annual volume of surface water runoff which flows from any specific site during and following development to not exceed the pre-development hydrologic regime to the maximum extent practicable.
(d) Reduces stormwater runoff rates and volumes, soil erosion and nonpoint source pollution where possible, through stormwater management controls and to ensure that these management controls are property maintained and pose no threat to public safety.
(B) The Post-Construction Stormwater Management Plan shall be submitted for all subdivisions that discharge to MS4 high quality waters. This includes residential, commercial, and industrial developments. The PC-SWMP is required for all sites one acre and larger in size, and all sites part of a greater common development.
(C) The city reserves the right to develop or adopt other guidance documents to serve as design and implementation standards. Other guidance documents distributed by the city should be reviewed and considered when preparing the Post Construction SWMP. These documents may be applied as standards by which designs are to be prepared and controls implemented.
(D) The city shall have the authority to implement this chapter by appropriate regulations, guidance or other related materials. In this regard, technical administrative or procedural matters may be modified as needed to meet the objective herein.
(Ord. 2809, passed 12-10-2012)