City of Flagstaff

Stormwater Management Design Manual

CityArizonahighNoCitations verified

Other manuals in Arizona: Arizona Department of Transportation (ADOT), City of Chandler, City of Mesa, City of Phoenix, City of Scottsdale, City of Tucson, City of Yuma, Maricopa County / Flood Control District of Maricopa County, Pima County, Town of Prescott Valley

Document Metadata

Jurisdiction level

City

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State

Arizona

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Version / edition

2025

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Adoption / effective date

Not found in document

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Last revised date

2025

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Relationship to state manual

independent

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Design Criteria

Design storm return periods (years)

2-year, 5-year, 10-year, 25-year, 50-year, 100-year

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Water quality volume method

Low Impact Development Runoff Capture Volume (ROCV): Impervious Surface Area (sq ft) × 1 inch = ROCV. ROCV requirement may be met by (1) retaining the minimum ROCV for ≥24 hours, (2) treating the discharge from the 2-year storm, or (3) a combination. Detailed LID design per City of Flagstaff LID Guidance Manual.

“Impervious Surface Area (square feet) X 1 inch = Runoff Capture Volume”
§6.0 LID / ROCV

Peak flow calculation method(s)

Rational Method / hydrograph methods per Ch.4 Hydrology, On-site detention for developments >1/4 acre (policies in §5.3.8), 2-year detention waived if site fully captures ROCV

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Hydrologic/hydraulic software

Not found in document

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Approved BMP categories

LID / Runoff Capture Volume facilities, Detention / multi-purpose basins, Rainwater harvesting (passive/active), Bio-filters / infiltration, Extended detention

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