City of Bismarck

Stormwater Design Standards Manual

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Peak discharge storms, water quality requirements (0.5 in / 80% TSS), NRCS methods, and acceptable software are explicitly stated. Prescriptive Vwq sizing details are in appendix Reference 5-2, not reproduced in main text. Pipeline excerpt repair removed 1 unlocated citation(s).

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Other manuals in North Dakota: City of Fargo, North Dakota

Document Metadata

Jurisdiction level

City

“Municipal Public Works Improvements Bismarck, North Dakota” available from the office of the City Engineer. Stormwater Management Plan (SWMP) A written document detailing stormwater runoff characteristics for a defined area and the management of that runoff to mitigate advers”
p. 15

State

North Dakota

“Municipal Public Works Improvements Bismarck, North Dakota” available from the office of the City Engineer. Stormwater Management Plan (SWMP) A written document detailing stormwater runoff characteristics for a defined area and the management of that runoff to mitigate advers”
p. 15

Version / edition

Not found in document

No evidence cited

Adoption / effective date

2018-01-01

“for activities constructed after January 1, 2018 that meet one or more of the following criteria: 1. Land disturbance greater than or equal to 3,000 square feet and less than 10,000 square feet, occurring on land with slopes of less than 12 percent; or”
p. 21

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

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