Mississippi

MDOT Drainage Manual

StateDOTMississippimediumNeeds reviewVerify pending

This extraction is flagged for quality review.

Compare each cited field to the official PDF before relying on it. What this means

Excerpts cite check/design/review floods and storm-drain frequencies but do not include Figure 1.3-A or Figure 4.5-A numeric design-frequency tables. No explicit water-quality volume method or enumerated approved BMP category list in provided text. adoption_or_effective_date not stated.

Fields not found in document: document_metadata.adoption_or_effective_date, design_criteria.water_quality_volume_method, design_criteria.approved_bmp_categories

Other manuals in Mississippi: City of Gulfport, City of Jackson, Mississippi

Document Metadata

Jurisdiction level

State

No evidence cited

State

Mississippi

No evidence cited

Version / edition

November 2025

“MDOT Drainage Manual November 2025”
pages 14-14

Adoption / effective date

Not found in document

No evidence cited

Last revised date

November 2025

“MDOT Drainage Manual November 2025”
pages 14-14

Relationship to state manual

independent

No evidence cited

Design Criteria

Design storm return periods (years)

2-year, 5-year, 10-year, 20-year, 25-year, 50-year, 100-year, 200-year, 500-year

“The check flood should, at a minimum, be the 1% (base) flood. A super flood or superstorm, such as the 0.2% flood, may be used”
page 19, Section 1.3.3

Water quality volume method

Not found in document

No evidence cited

Peak flow calculation method(s)

USGS rural regression equations (StreamStats/NSS), Rational Method, NRCS Curve Number (Hydrograph) Method, WMS and HEC-HMS, Transposition of Streamflow Records, NRCS Unit Hydrograph, Snyder Unit Hydrograph

“Rational Method (Section 1.7). Provides peak runoff rates for small urban and rural watersheds less than 200 acres.”
page 22, Section 1.4.3 Hydrographs

Hydrologic/hydraulic software

USGS StreamStats, USGS NSS, FHWA Hydraulic Toolbox, WMS, HEC-HMS

“included in the USGS StreamStats and USGS NSS software, with USGS StreamStats being the preferred alternative.”
page 22, Section 1.4.3 Hydrographs

Approved BMP categories

Not found in document

No evidence cited