City of Tacoma

Design Manual Update

City of Tacoma

Public Meeting April 10, 2014

Jim Parvey, P.E., LEED APCity of Tacoma

Senior Principal Engineer

Manual last updated in 2004.Changes in Surface Water

Regulation require manual to be reviewed and updated as needed.

Opportunity to update other sections of manual.

Need For Update

NPDES LID Code Revision

Public Meeting April 10, 2014

Merita Trohimovich, P.E. City of Tacoma

Surface Water Engineer

The intent of the code revisions shall be to make LID the preferred and commonly-used approach to site development.

Revisions shall be designed to: minimize impervious surfaces, minimize native vegetation loss, and minimize stormwater runoff in all types of development situations.

S5.C.5 b LID Code-related Requirements

Direct Approach:All projects shall complete LID feasibility analysis and implement to maximum extent feasible.

Tacoma’s Proposed Approach: Remove barriers; Make equivalent guidance; Add incentives; Provide equivalent manual; and Lead by example.

LID Code Updates Approach

Code Update Process Guidance

Reviewing all development codes, regulatory and guidance documents

Partnering with planning department using existing process for code adoption

Using Standards Committee existing process to update Public Works Design Manual

Creating internal work groups Public outreach

Tacoma’s Process

Process and schedule developed Staff, manager, supervisor education Team on board Team educated Beginning public education Beginning actual work of

code review and revision

Work to Date

What is needed to implement LID? Additional training and technical support Additional details and pre-engineered sizing Site assessment and design guidance Guidance for minimizing impervious surfaces Tree retention and protection specifications Methods for retaining native vegetation Soil testing assistance Training workshops Online information

LID Design Needs

What would help you choose LID over traditional stormwater options? Faster permit review Reduction of permit fees Allowance to modify design elements (additional

height, ability to decrease setbacks, lower parking requirements, less landscaping)

Reduction in surface water fees Training and Education Other?

Choosing LID

Merita TrohimovichCity of Tacoma Surface Water [email protected]

Contact me for suggestions, questions and to get involved.

Contact Information