City of Bismarck

Stormwater Design Standards Manual

CityNorth DakotahighNo

Open source PDF ↗Official agency page ↗

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Document Metadata

Jurisdiction level

municipality

“City of Bismarck, ND”
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State

North Dakota

“City of Bismarck, ND”
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Version / edition

Approved August 22, 2017; Effective January 1, 2018

“Approved: August 22, 2017 Effective: January 1, 2018”
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Adoption / effective date

2018-01-01

“Effective: January 1, 2018”
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Last revised date

Not found in document

No evidence cited

Relationship to state manual

independent

“The goal of this section is to provide guidance on the design, performance, and analysis requirements of the City of Bismarck regarding Post-Construction Peak Discharge Compliance.”
Section 4.0, Page 4-1

Design Criteria

Design storm return periods (years)

2-year, 5-year, 10-year, 100-year

“Post-Construction runoff resulting from the 2-, 5-, 10-, and 100-year 24-hour rainfall events shall not exceed the runoff rate of the existing conditions.”
Table 4-1, Page 4-1

Water quality volume method

Water quality volume (Vwq) determined per Reference 5-2; new development uses prescriptive BMP sizing (Reference 5-1); redevelopment and retrofit must treat the first 0.5 inches of runoff from impervious areas, or demonstrate 80% TSS removal on an average annual basis via an approved alternative BMP method.

“Design BMPs to treat the first 0.5 inches of runoff from impervious areas. 80% Total Suspended Solids (TSS) removal on an average annual basis shall be achieved.”
Table 5-1, Page 5-1

Peak flow calculation method(s)

NRCS (SCS) Curve Number Method, NRCS Unit Hydrograph Methods

“NRCS (SCS) Curve Number (CN) Method, NRCS Unit Hydrograph Methods & Time of Concentration Methods. The Rational Method is not an accepted methodology for Peak Discharge Control Compliance.”
Section 4.4.1, Page 4-9

Required hydrologic/hydraulic software

HydroCAD, InfoSWMM, XP-SWMM / XP-STORM, Storm & Sanitary Analysis (SSA), Bentley CivilStorm, Civil 3D Hydrographs, HEC-HMS

“1. HydroCAD 2. InfoSWMM 3. XP-SWMM / XP-STORM 4. Storm & Sanitary Analysis (SSA) 5. Bentley CivilStorm 6. Civil 3D Hydrographs 7. HEC-HMS”
Reference 4-4, Appendix 4

Approved BMP categories

Detention Basins, Infiltration BMPs, Filtration BMPs, Flow Through BMPs (proprietary mechanical treatment devices)

“5.3.1 DETENTION BASINS ... 5.3.2 INFILTRATION BMPS ... 5.3.3 FLOW THROUGH BMPS”
Section 5.3, Pages 5-5 to 5-7