Tahoe Regional Planning Agency (Lake Tahoe Region)

TRPA Best Management Practices Handbook

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Bi-state Lake Tahoe Region (CA/NV) TRPA BMP Handbook. state_code CA used for atlas mapping; jurisdiction spans both California and Nevada shorelines. Large combined PDF (736 pages); prepared text truncated at 750k chars. Individual chapters on tahoebmp.org may be newer (e.g., Ch5 Dec 2024) than the bundled complete PDF (May 2014). Pipeline excerpt repair removed 1 unlocated citation(s).

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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, County of Orange, Fresno Metropolitan Flood Control District, Riverside County, San Bernardino County

Document Metadata

Jurisdiction level

Special District

“The Tahoe Regional Planning Agency (TRPA) Best Management Practices (BMP) Handbook provides technical and planning guidance to landowners, private businesses, agencies, and jurisdictions for water quality improvement projects.”
Preface

State

California

No evidence cited

Version / edition

Not found in document

No evidence cited

Adoption / effective date

2014-05-01

No evidence cited

Last revised date

Not found in document

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Relationship to state manual

independent

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Design Criteria

Design storm return periods (years)

20-year, 100-year

“The design storm for parcel-based BMPs at Lake Tahoe is the 20-yr/1-hr rainfall event, approximately 1 inch of water falling in 1 hour.”
Introduction, Page 16

Water quality volume method

Parcel-based infiltration BMPs are sized to contain and infiltrate runoff from impervious surfaces for the 20-year return period, 1-hour duration design storm (approximately 1 inch in 1 hour). TRPA regulations require containment of that volume from impervious areas; the NRCS BMP Calculation Spreadsheet multiplies 20-yr/1-hr intensity by each impervious surface area. Public right-of-way BMPs use pollutant load reduction modeling tools rather than a single WQv formula.

“TRPA regulations, which require containment of the stormwater runoff volume generated by a 20-year return period, 1-hour duration "design storm" from impervious surfaces on a parcel.”
Chapter 1, Section 1.3.3.2 NRCS BMP Calculation Spreadsheet

Peak flow calculation method(s)

Rational Method, NRCS BMP Calculation Spreadsheet, Load Reduction Planning Tool (LRPT), Hydrologic Modeling System (HMS), Pollutant Load Reduction Model (PLRM)

“application of the well-known "Rational Method" involves derivation of a runoff coefficient based on measurable land use conditions”
Chapter 1, Section 1.2.4

Hydrologic/hydraulic software

NRCS BMP Calculation Spreadsheet, Load Reduction Planning Tool (LRPT), Hydrologic Modeling System (HMS), Pollutant Load Reduction Model (PLRM), HSPF / LSPC, Storm Water Management Model (SWMM)

“1.3.3.3 Rational Method ... 1.3.3.4 Load Reduction Planning Tool (LRPT) ... 1.3.3.5 Hydrologic Modeling System (HMS) ... 1.3.3.6 Pollutant Load Reduction Model (PLRM) ... 1.3.3.7 HSPF and LSPC ... 1.3.3.8 Storm Water Management Model (SWMM)”
Chapter 1 Table of Contents

Approved BMP categories

Hydrologic Source Control — Pervious Pavement, Hydrologic Source Control — Infiltration Basin, Hydrologic Source Control — Infiltration Trench, Hydrologic Source Control — Subsurface Infiltration System, Hydrologic Source Control — Rain Barrel and Cistern, Hydrologic Source Control — Rain Garden, Hydrologic Source Control — Filter Strip, Pollutant Source Control — Abrasive and Deicer Management, Pollutant Source Control — Street Sweeping, Pollutant Source Control — Snow Storage, Pollutant Source Control — Vegetated Slope Stabilization, Pollutant Source Control — Waste and Hazardous Material Management, Stormwater Collection — Culvert, Curb and Gutter, Storm Drain, Stormwater Collection — Rock Lined and Vegetated Swale, Stormwater Collection — Check Dams, Stormwater Treatment — Wet Basin, Stormwater Treatment — Bioswale, Stormwater Treatment — Dry Basin, Stormwater Treatment — Drop Inlet Insert, Stormwater Treatment — Hydrodynamic Separator, Stormwater Treatment — Media Filter, Stormwater Treatment — Sediment Trap, Temporary Construction BMPs

“4.1 Hydrologic Source Control ... 4.2 Pollutant Source Control ... 4.3 Stormwater Collection and Conveyance ... 4.4 Stormwater Treatment ... 4.5 Temporary BMPs for Construction”
Chapter 4: BMP Toolkit Table of Contents