a project funded by an USEPA Watershed Management Assistance Grant April 25 2013 Jim Simmonds King County JimSimmondskingcountygov 4252013 1 What Are Stormwater Retrofits Construction projects to control stormwater ID: 389816
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Stakeholder Workshop #3 Stormwater Retrofit Planning Project for WRIA 9
a project funded by anUSEPA Watershed ManagementAssistance GrantApril 25, 2013Jim SimmondsKing CountyJim.Simmonds@kingcounty.gov
4/25/2013
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What Are Stormwater Retrofits
Construction projects to control stormwaterLocations that have previously been developedSited where existing stormwater controls are inadequate or don’t existNot part of redevelopment4/25/2013
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Stormwater Paradigm
Time PeriodParadigmDescription
Prior to 1992Drainage Efficiency
Convey water downhill as
efficiently
as possible
1992 – Now
Minimize
New
ImpactsMinimize harm from new development with ponds and treatmentFutureRestoreCapture, detain, treat stormwater everywhere to protect and restore receiving waters
4/25/2013
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Stormwater Retrofit Examples
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Ponds
Bioswales
Check Dams
Cisterns
Pervious Pavement
Rain Gardens
Green Roofs
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Estimated Stormwater Needs
$3B - $15B for treatment in Puget SoundCapital costs, no O&M, no land costs$1.4B for Juanita Creek basin (7 sq miles)Full lifecycle cost$1.1B for 64 small basins in unincorporated King CountyFull lifecycle costs4/25/2013
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4/2/2013
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Stormwater Retrofit Planning for WRIA 9
$1M grant from EPA, $335K matchModel stormwater retrofit needs in WRIA 9Cost effectivenessWork with stakeholdersPresent retrofit options analysis to WRIA 9 Watershed Ecosystem ForumExtrapolate cost estimates to all Puget Sound4/25/2013
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Project Area
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WRIA 9 except
Headwaters above Howard Hanson Dam (forested)
City of Seattle (combined system)
Vashon Island
Focus on streams
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Project Team and Funding
OrganizationEPA FundingLocal MatchUSEPA*
King County
$707k
$300k
University
of Washington
$243k
$20k
Department of Ecology**City of Auburn0$5k
City of Covington0
$5k
City of SeaTac
0
$5k
Kellogg Consulting
$50k
0
* USEPA contributing $1M in grant funding, and staff time to project management team
** Ecology contributing staff time to project management team and updating retrofit database
4/25/2013
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Project Benefits
WRIA 9 and Puget Sound-wide planning-level estimate of facility and funding needsCost vs stream improvementDemonstrate use of modeling toolsInfluence capital project planningInfluence discussion on new fundingInfluence future NPDES permits4/25/2013
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Project Schedule
2010
2011
2012
2013
Data Collection
Identify
Indicators and Target Ranges
Watershed Modeling
Retrofit Modeling
Retrofit Options Analysis
Estimate Puget Sound Costs
Workshop
#1
Workshop
#3
Workshop
#2
Workshop
#4
We Are Here
Stakeholder Input
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Thank You for you Input!
Workshop #1 April 2011Answered extensive questions about project scope, goals and limitationsReceived input on modeling scenarios and in-stream indicators Workshop #2 January 2012Received input on indicators and approaches for defining ranges of possible targetsReceived input on BMPs to assessAdjusted scope to address input
4/25/2013
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The Past 15 Months
Watershed modelingRanges of in-stream targetsBMPs to include in modelBMP design and cost assumptionsSUSTAIN pilot study in a 270-acre catchmentIndependent analysis to corroborate SUSTAIN model4/25/2013
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What Will You Do Today?
Hear updates on in-stream target rangesHear methods and results of a retrofit modeling pilot study and provide feedbackOn BMP design and cost assumptionsOn how to best report resultsHear the approach for modeling all of WRIA 9 and provide inputHear
updates on other assessments of stormwater retrofit needs
4/25/2013
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Review Draft Reports
Indicators and range of targets report and SUSTAIN pilot study reporthttp://www.kingcounty.gov/environment/watersheds/green-river/stormwater-retrofit-project.aspxSend comments by May 8 to Beth.leDoux@KingCounty.govHSPF watershed modeling reportWill notify when posted
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Sprint to the Finish
Spring 2013: Finalize HSPF modeling report, in-stream goal and range of targets report, and SUSTAIN pilot study report Summer/fall 2013: Draft SUSTAIN modeling report and draft WRIA 9 retrofit options analysisFall 2013: Workshop #4Late 2013: Finalize SUSTAIN modeling report, WRIA 9 retrofit options analysis, and Puget Sound cost estimate
4/25/2013
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Opportunities for Participation
Review and comment on draft reportsStakeholder workshop # 4Review and comment on future reportsWRIA 9 Watershed Ecosystem ForumOne-on-one outreachQuarterly e-mail updates4/25/2013
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More Info
http://www.kingcounty.gov/environment/watersheds/green-river/stormwater-retrofit-project.aspxJim.Simmonds@KingCounty.govBeth.leDoux@KingCounty.gov4/25/2013
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