California Department of Transportation (Caltrans)

Construction Site Best Management Practices (BMP) Manual

StateCaliforniahighNo

Open source PDF ↗Official agency page ↗

Fields not found in document: design_criteria.water_quality_volume_method

Other manuals in California: California, City of San Diego, County of Los Angeles

Document Metadata

Jurisdiction level

state

“California Department of Transportation”
Title Page

State

California

“Sacramento, California 95814”
Title Page

Version / edition

March 2024 (CTSW-RT-24-425.11.1)

“March 2024 CTSW-RT-24-425.11.1”
Title Page

Adoption / effective date

2024-03-01

“Report Date: March 2024”
Caltrans Technical Report Documentation Page

Last revised date

2024-03-01

“Report Date: March 2024”
Caltrans Technical Report Documentation Page

Relationship to state manual

adopts state manual directly

“construction projects with 1 acre or more of soil disturbance to comply with the CGP Order WQ 2022-0057-DWQ and amendments thereto”
Section 1.2.2, Page 1-2

Design Criteria

Design storm return periods (years)

2-year

“A 2-year, 24-hour storm event has been used by many as a default event, but recent studies have shown that this may oversize the system”
Section 7.1.5 NS-5 Clear Water Diversion, Page 7-5

Water quality volume method

Not found in document

No evidence cited

Peak flow calculation method(s)

Revised Universal Soil Loss Equation v2 (RUSLE2)

“The equivalent sediment load may be calculated using the Revised Universal Soil Loss Equation, version 2 (RUSLE2) or another method approved by the Regional Water Board.”
Section 2.3.1 Surface Water Buffers, Page 2-7

Required hydrologic/hydraulic software

RUSLE2

“calculated using the Revised Universal Soil Loss Equation, version 2 (RUSLE2)”
Section 2.3.1 Surface Water Buffers, Page 2-7

Approved BMP categories

Temporary Soil Stabilization, Temporary Sediment Control, Wind Erosion Control, Tracking Control, Non-Stormwater Management, Waste Management and Materials Pollution Control, Biofiltration Systems, Design Pollution Prevention Infiltration Areas, Infiltration Devices, Detention Devices, Traction Sand Traps, Dry Weather Flow Diversion, Full-capture Trash Devices, Media Filters, Multi-chamber Treatment Train, Wet Basins, Bioretention, Open Graded Friction Course, Porous Pavement

“Caltrans Construction Site BMPs are divided into six categories, as shown in Table 2-1: Temporary Soil Stabilization, Temporary Sediment Control, Wind Erosion Control, Tracking Control, Non-Stormwater Management, Waste Management and Materials Pollution Control”
Section 2.2, Table 2-1, Pages 2-5 to 2-7