City of Baltimore

Stormwater Management Minimum Requirements

CityMarylandhighNoCitations verified

Fields not found in document: design_criteria.required_hydrologic_hydraulic_software

Other manuals in Maryland: City of Annapolis, City of Rockville, Maryland, Maryland, Prince Georges County

Document Metadata

Jurisdiction level

City

“Article 7, Division II of the City Code requires that land disturbance activities must have stormwater management plans approved by the Department of Public Works (DPW).”
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State

Maryland

“comply with the 2000 Maryland Stormwater Design Manual (Revised)”
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Version / edition

October 2019

“Baltimore City DPW October 2019”
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Adoption / effective date

2019-10

“Baltimore City DPW October 2019”
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Last revised date

2019-10

“Baltimore City DPW October 2019”
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Relationship to state manual

adopts state manual directly

“The stormwater management plans must also comply with the 2000 Maryland Stormwater Design Manual (Revised)”
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Design Criteria

Design storm return periods (years)

1-year, 10-year, 100-year

“Channel protection volume (CPV): 24-hour extended detention of a one-year storm... Overbank flood protection volume (Q10): control of the peak flow rate of a 10-year storm... Extreme flood volume (Q100): control of the peak flow rate of a 100-year storm”
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Water quality volume method

Qualitative control uses water quality volume and recharge volume per the 2000 Maryland Stormwater Design Manual (Revised), with ESD to the MEP. New development: treat 1.0 inch. Redevelopment: treat 0.5 inch, or remove 50% of impervious area, or a combination. Quasi-redevelopment: redevelopment rules for existing impervious plus new-development rules for added impervious.

“New development Treatment of 1.0 inch... Redevelopment Treatment of 0.5 inch; or 50% removal of impervious surface area; or Combination of both.”
Table 1, Page 5

Peak flow calculation method(s)

Channel protection volume (CPv): 24-hour extended detention of the 1-year, 24-hour storm vs woods in good condition, Overbank flood protection (Q10): control 10-year peak vs existing conditions, Extreme flood (Q100): control 100-year peak vs existing conditions (required for inter-jurisdictional watersheds and noted flood hazard areas)

“CPV and Q10 are required in all areas, except if directly discharging to tidal areas. Q100 is required for inter-jurisdictional watershed and flood hazard areas noted in this document.”
Table 1, Page 5

Hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Environmental Site Design (ESD) practices (per MD Design Manual), Structural practices (per MD Design Manual), Alternative practices, Off-site treatment (same 8-digit watershed, within City), Fee-in-lieu of treatment (DPW discretion after MEP)

“Proposed stormwater management must demonstrate ESD to the MEP... environmental site design (ESD) must be the first approach in stormwater management design, followed by structural practices then alternative practices.”
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