City Council and Concurrent Authorities
March 7, 2023

Stormwater Master Plan Overview
Stockton City Council
March 7, 2023
Agenda Item No. 15.1
Presentation Topics
•Stormwater Master Plan Purpose
•Coordination with Other Plans
•Overview of Approach
•Focus Areas and Priorities
•Key Findings
•Example Improvement Concept
•Financial Analysis Summary
•Stormwater Master Plan Conclusions
•Next Steps
Stormwater Master Plan Purpose
•Identify and evaluate
flooding concerns
•Develop CIP projects to
alleviate flooding
•Support future development
3 Stockton Stormwater Overview
Connections to Past & Other Efforts
4 Stormwater Water Wastewater
2008 Storm Drain
Master Plan
2009 NPDES Stormwater
Management Plan
2017 General Plan
Stormwater Supplement
5 Focus Areas and Priorities
6 Focus on analysis of City’s stormwater infrastructure and 10‐yr, 24‐hr design storm event
Key Findings
•Existing detailed stormwater inventory data is
limited
•Existing flooding concerns are distributed
throughout the study area
•New development often creates or exacerbates
flooding concerns
•12 improvement concepts developed with costs
ranging from $5‐75M
•Improvements focused on larger flooding issues but
could be augmented by smaller‐scale projects
7 Sample Proposed Improvement
8 Proposed Improvement Summary
9 Project Cost Priority
Boggs Tract $17,144,585 High
Bonniebrook $11,547,232 High
Hwy 4 and San Joaquin $24,902,729 High
Walker Turnpike Alt 1 * $46,204,468 High
Walker Turnpike Alt 2 + Eighth
St and San Joaquin * $75,142,267 High
Bianchi and Calaveras $30,682,180 Medium
Duck Creek $12,061,203 Medium
Legion Park and Smith Canal $50,864,178 Medium
Deep Water $10,229,853 Low
Little John Creek $4,552,126 Low
Mormon Slough $27,524,026 Low
Sutter and Calaveras River $13,710,877 Low
West Lane and Calaveras River $6,517,147 Low
Total $256-$285M
* Denoted projects are alternatives and would not both be constructed Financial Analysis Summary
•Expenditures expected to increase at a rate
higher than revenues for operational costs
alone
•Multiple funding mechanisms would be
necessary to support ongoing operations and
any future capital investments
•Implementation of a reliable and predictable
revenue stream is recommended for long‐
term operation expenditures and capital costs
10 Conclusions
•Stormwater needs are substantial
•Addressing stormwater needs will require a
new approach involving capital improvements
and funding mechanisms to support
•Collaboration with stakeholders (i.e. SJAFCA)
needed to consider downstream impacts and
discharge limitations
•Developed model expected to serve as a
valuable tool for future projects and
development decisions
11 Recommendation
12 City Council approve:
• The determination that the Stormwater Master Plan
is exempt per Section
15183 of CEQA guidelines,
and no further
environmental review is required.
• A resolution to adopt the 2023 Stormwater Master
Plan
in support of the Envision Stockton 2040
General Plan Update.