County of Orange

Orange County Local Drainage Manual

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

OC Local Drainage Manual is hydraulics-focused; post-construction LID/WQ primarily in OC DAMP/TGD — consider adding TGD next. Pipeline excerpt repair removed 1 unlocated citation(s).

Fields not found in document: document_metadata.adoption_or_effective_date, document_metadata.last_revised_date, design_criteria.required_hydrologic_hydraulic_software, document_metadata.version_or_edition

Other manuals in California: Alameda Countywide Clean Water Program (ACCWP) / City of Fremont, California, California Department of Transportation (Caltrans), California Department of Transportation (Caltrans), City of Anaheim, City of Bakersfield, City of Chula Vista, City of Long Beach, City of Oakland, City of Sacramento, City of San Diego, City of San Francisco, City of San Jose / Santa Clara Valley (SCVURPPP), City of Santa Barbara, City of Santa Rosa, City of Stockton / San Joaquin County, County of Los Angeles, Fresno Metropolitan Flood Control District, Riverside County, San Bernardino County, Tahoe Regional Planning Agency (Lake Tahoe Region)

Document Metadata

Jurisdiction level

County

“unincorporated Orange County”
Purpose

State

California

“Porter-Cologne Water Quality Control Act”
Section 1.6.3

Version / edition

Not found in document

No evidence cited

Adoption / effective date

Not found in document

No evidence cited

Last revised date

Not found in document

No evidence cited

Relationship to state manual

independent

“Orange County Drainage Area Management Plan (DAMP)”
Purpose

Design Criteria

Design storm return periods (years)

100-year

“100-year Floodplain”
Section 11.3.1

Water quality volume method

Local detention basins chapter includes water quality & hydromodification considerations (7.2.10). Manual focuses on local drainage (tributary ≤640 acres); larger facilities per OCFCD Design Manual. Does not supersede Orange County DAMP.

“Water Quality & Hydromodification Considerations”
Section 7.2.10

Peak flow calculation method(s)

Local drainage facility hydraulic design (Chapters 3–9), Detention routing analysis procedures, 100-year floodplain procedures (Chapter 11)

“Design Procedure - Detention Routing Analysis”
Chapter 7

Hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Local detention basins, Vegetated swales (water quality example), Storm drains and local drainage structures

“Local Detention Basins / Water Quality Vegetated Swale”
Chapter 7 / Figure 6-9