Unless judged by the public works department to be exempt or granted a waiver, the following performance criteria shall be addressed for stormwater management at all sites:
A. All site designs shall establish stormwater management practices to control the peak flow rates of stormwater discharge associated with specified design storms and reduce the generation of stormwater runoff. These practices should seek to utilize pervious areas for stormwater treatment and to infiltrate stormwater runoff from driveways, sidewalks, rooftops, parking lots and landscaped areas to the maximum extent practical to provide treatment for both water quality and quantity.
B. Stormwater runoff generated from new development shall not be allowed to discharge into a jurisdictional wetland or local water body without adequate treatment. Where such discharges are proposed, the impact of the proposal on wetland functional values shall be assessed using a method acceptable to the public works department. In no case shall the impact on functional values be any less than allowed by the army corps of engineers (ACE) or the department of environmental quality (DEQ) responsible for natural resources.
C. Annual groundwater recharge rates shall be maintained by promoting infiltration through the use of structural and nonstructural methods. At a minimum, annual recharge from the postdevelopment site shall mimic the annual recharge from predevelopment site conditions.
D. Stormwater discharges from land uses or activities with higher potential pollutant loadings, as determined by the city engineer, may require the use of specific structural BMPs and pollution prevention practices.
E. Prior to design, applicants are required to consult with the public works department to determine if they are subject to additional stormwater design requirements. (Ord. 2016-12, 8-16-2016)