Stormwater Atlas

City of Shreveport

Drainage Design Standards

CityLouisianamediumNeeds reviewCitations verified
Open source PDF ↗Official agency page ↗

This extraction is flagged for quality review.

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

Large standards PDF (324 pages / many detail sheets); WQ focus is primarily peak detention rather than fixed rainfall-depth WQv.

Fields not found in document: design_criteria.required_hydrologic_hydraulic_software
Other manuals in Louisiana: City of Baton Rouge / East Baton Rouge Parish, City of Lafayette, Louisiana, Orleans and Jefferson Parishes

Document Metadata

Jurisdiction level
City

No evidence cited

State
Louisiana

No evidence cited

Version / edition
October 14, 2021

“October 14, 2021”

Cover

Adoption / effective date
2021-10-14

No evidence cited

Last revised date
2021-10-14

No evidence cited

Relationship to state manual
independent

“independent city drainage design standards”

Coverage note

Design Criteria

Design storm return periods (years)
10-year, 25-year, 100-year

“Storm Sewers and Inlets ... 10-yr; Main Drainage Channels 25-yr; Detention or Retention Features 25yr; 100-year frequency storm ... SFHA”

Table 2-1

Water quality volume method
Detention basins reduce post-development peak flow to pre-development for the 10-, 25-, and 100-year design storms. Design frequencies (Table 2-1): storm sewers/inlets 10-year; main channels / arterial cross drains / detention features 25-year; 100-year hydraulic gradient in SFHA and critical arterial underpasses. Rational Method ≤200 ac; NRCS 200–2,000 ac.

“reducing peak flow of a post-development site to peak flow the pre-development ... 10-year, 25-year, and 100-year design storms”

§9 Stormwater Detention

Peak flow calculation method(s)
Rational Method (≤200 acres), NRCS Method (200–2,000 acres), USGS Method (>2,000 acres), Detention routing for 10-/25-/100-year storms

No evidence cited

Hydrologic/hydraulic software
Not found in document

No evidence cited

Approved BMP categories
Stormwater detention basins, Retention features, Storm sewers and inlets, Open channels / main drainage channels, Cross drains / side drains

No evidence cited