City of San Francisco

San Francisco Stormwater Management Requirements and Design Guidelines

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SFPUC/Port May 2016 SMR. Design storms emphasized for combined-sewer quantity control are 1- and 2-year 24-hour; separate-sewer Large Projects use 85th/90th percentile 24-hour storms rather than return-period WQv. Numeric percentile depths live in the BMP sizing calculators, not tabulated as inches in the main narrative. 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 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, Tahoe Regional Planning Agency (Lake Tahoe Region)

Document Metadata

Jurisdiction level

City

“Approximately 90 percent of San Francisco is served by a combined sewer system, with the remaining 10 percent served by separate storm sewer systems”
Chapter 3 / San Francisco's Stormwater Infrastructure

State

California

“staff from the counties of Contra Costa and Santa Clara, California”
Acknowledgements

Version / edition

Not found in document

No evidence cited

Adoption / effective date

2016-05-27

“The 2016 SMR performance requirements apply to projects with Preliminary SCPs submitted on or after May 27, 2016.”
Chapter 5 / Applicability Dates

Last revised date

2016-05

“of impervious surface. ʶ The 2016 version includes an option for eligible projects to comply with Modified Compliance requirements. This option was not available in the 2010 SMR. 6 Separate Sewer Area Performance Requirements Describes performance requirements specific to p”
p. 17

Relationship to state manual

independent

“This document is an update of the 2010 San Francisco Stormwater Design Guidelines (Guidelines).”
Executive Summary / Introduction

Design Criteria

Design storm return periods (years)

1-year, 2-year

“Case 1: Projects with existing imperviousness of less than or equal to 50 percent must maintain a stormwater runoff rate and volume at or below pre-development conditions for the 1- and 2-year, 24-hour design storms.”
Chapter 5 / Combined Sewer Area Performance Requirements

Water quality volume method

Combined sewer (Case 1, ≤50% existing impervious): maintain runoff rate and volume at or below pre-development for the 1- and 2-year, 24-hour storms. Combined sewer (Case 2, >50% impervious): reduce runoff rate and volume by 25% relative to pre-development for the 2-year, 24-hour storm (Modified Compliance may trade volume vs peak reductions). Separate sewer Large Projects (≥5,000 sf): SFPUC jurisdiction manage the 90th percentile 24-hour storm; Port jurisdiction manage the 85th percentile 24-hour storm. Separate sewer Small Projects (2,500–5,000 sf): implement at least one Site Design Measure and report runoff reduction via State Water Board SMARTS calculator.

“Projects within SFPUC jurisdiction must manage the 90th percentile, 24-hour storm / Projects within the Port's jurisdiction must manage the 85th percentile, 24-hour storm”
Chapter 6 / Table 3 Separate Sewer Area Performance Requirements

Peak flow calculation method(s)

SFPUC electronic BMP Sizing Calculators (sites ≤5 acres or sub-watersheds ≤2 acres), Santa Barbara Urban Hydrograph Method (basis of Combined Sewer Area BMP Sizing Calculator), Hydrologic modeling required for larger/more complex projects

“Projects that are five acres or less, or with sub-watershed areas that are two acres or less, can use the SFPUC's electronic BMP Sizing Calculators to size BMPs. Larger, more complex development projects can use the BMP Sizing Calculators as planning tools, but must use modelling to prove compliance with the SMR.”
Chapter 4 Task 3B

Hydrologic/hydraulic software

SFPUC BMP Sizing Calculators (combined and separate sewer spreadsheets), State Water Board SMARTS calculator (separate sewer Small Projects)

“The two calculator spreadsheets, one for combined sewer area projects and one for separate sewer area projects, are available on the SFPUC website at www.sfwater.org/smr.”
Chapter 4 Task 3B

Approved BMP categories

Rainwater harvesting, Permeable pavement, Vegetated roof, Unlined bioretention / rain garden, Bioretention swales, Subsurface infiltration system / infiltration trench, Infiltration basin, Constructed wetland, Lined bioretention / flow-through planter, Detention tank, Detention pond, Wet pond, High-rate filtration (tree-box filters, media filters; separate sewer Large Projects, approval required), Pretreatment: conveyance swales, vegetated buffer strips, swirl separators, drain inserts, water quality inlets (treatment train only)

“The required BMP Hierarchy prioritizes infiltration-based BMPs, rainwater harvesting, and vegetated roofs followed by lined bioretention (commonly known as a "flow-through planter").”
Executive Summary / What's New