City of Manchester
New Hampshire Model Stormwater Standards / NH Stormwater Manual (city regs)
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Compare each cited field to the official PDF before relying on it. What this means
Municipality coverage via NH Model Stormwater Standards (2025 update). City also posts local Stormwater Regulations PDF.
Document Metadata
Jurisdiction level
City
No evidence cited
State
New Hampshire
No evidence cited
Version / edition
Draft: May, 2025
No evidence cited
Adoption / effective date
Not found in document
No evidence cited
Last revised date
2025-05
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Relationship to state manual
adopts state manual directly
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Design Criteria
Design storm return periods (years)
1-year, 2-year, 10-year, 25-year, 50-year, 100-year
No evidence cited
Water quality volume method
WQV = (P)(Rv)(A) where P = 1 inch of rainfall, Rv = 0.05 + 0.9(I), A = total site area draining to the structure (NH Model Stormwater Standards / NH Stormwater Manual). Manchester Sewer & Stormwater regulations implement NHDES post-construction standards consistent with this manual.
“WQV = (P)(Rv)(A) where P = 1 inch of rainfall”
NH Model Stormwater Standards
Peak flow calculation method(s)
TR-55
No evidence cited
Hydrologic/hydraulic software
Not found in document
No evidence cited
Approved BMP categories
raingardens, bioretention systems, tree box filters, subsurface gravel wetlands, filtration practices, infiltration practices, swales, detention areas
No evidence cited