Watershed location plays an important role in identifying how the Stormwater Regulations, specifically the Post‑Construction Stormwater Management Requirements, are applied to a project. Once the location of the development site is determined, Appendix D may be used to evaluate its Flood Management District, sewer service area, and Public Health and Safety (PHS) Release Rate area, if applicable. If they are unable to confirm any area, the applicant should contact Stormwater Plan Review. These maps are approximations of sewershed boundaries. The applicant must refer to their project’s point of stormwater discharge when determining which requirements apply to their project.
PWD Stormwater Management Guidance Manual v3.4
D. Watershed and PHS Release Rate Maps