Stormwater Management

A building and grading permits with ground disturbance are reviewed for stormwater management. Please review the SWM Checklist. Stormwater Management Water Quality Volume (WQv) and Recharge Volume (Rev) must be treated for:
  • Any new single family home
  • Any non-waterfront lot disturbing 5000+ square feet
  • Any waterfront lot disturbing 2000+ square feet

City Goal


The goal of the City of Annapolis is to reduce impervious surfaces (asphalt, concrete, home footprints, etc) by 50%. If this cannot be done, WQv must be treated at a rate of 50% of the total WQv calculated (per MDE design manual and City Code).

Design Manual Methods


WQv and Rev may be treated per the design manual methods. All treatment must be quantified. Treatment examples include:
  • Greenroofs
  • Infiltration trenches
  • Rain gardens
  • Rooftop and non-rooftop disconnect credits
See the MDE design manual for many further options. Please note tree plantings do not count for WQv treatment per the design manual.


Maintenance Agreement


Any Stormwater Management (SWM) facility must have a signed SWM maintenance agreement, ensuring it is properly inspected and maintained on a regular basis. Maintenance logs should be kept for each separate facility and shall be made available upon the City's request. If you need help setting up a maintenance log, please contact Public Works at 410-263-7949.

If your project has a SWM facility, you will be required to sign the SWM maintenance agreement before the grading permit will be issued. Information on obtaining the SWM maintenance agreement will be given upon initial review of the grading permit application.

Additional Controls


CPv, Qp and Qf are required on a case-by-case basis. Please have your engineer verify if the site conditions require these additional controls.