City of Missoula
Montana Circular DEQ-8 — Subdivision Storm Water Drainage Standards
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Compare each cited field to the official PDF before relying on it. What this means
Municipality coverage via Montana DEQ-8 (Helena pattern).
Document Metadata
Jurisdiction level
City
No evidence cited
State
Montana
No evidence cited
Version / edition
2024 Edition
No evidence cited
Adoption / effective date
2024
No evidence cited
Last revised date
2024
No evidence cited
Relationship to state manual
adopts state manual directly
No evidence cited
Design Criteria
Design storm return periods (years)
2-year, 10-year, 100-year
No evidence cited
Water quality volume method
Initial Storm Water Facility must infiltrate, evapotranspire, and/or capture for reuse post-development runoff from the first 0.5 inches of rainfall on impervious areas (V = 0.5 × Aimp / 12).
No evidence cited
Peak flow calculation method(s)
Rational Method, TR-55 / SCS Curve Number Method, Storage-Indication Routing
No evidence cited
Hydrologic/hydraulic software
Not found in document
No evidence cited
Approved BMP categories
Initial Storm Water Facility, Retention / Detention / Infiltration, Bioretention
No evidence cited