Introduction to Regional Stormwater Town Center City Council - PowerPoint PPT Presentation

Introduction to Regional Stormwater Town Center City Council Meeting April 3, 2017

Meeting Agenda What w we’re re w work rking ng o on Preliminary Site Implementation Feasibility Plan • Project Background • Site Information • Regional Stormwater 101 • Feasibility .

Project Background

Town Center Plan Adopted Town Center Regulations Adopted 2008 2010

Stormwater Development Standards (2010) Goals Goals Support and achieve the SUSTAINABI BILIT IT Y goals for the Town • Center PRES ESER ERVE N E NATURAL R RESOURCES ES of sensitive wetlands, critical • aquifer recharge areas and Ebright Creek’s kokanee spawning habitat Provide opportunities for INNO NNOVATIVE environmental management • techniques Encourage GR GREE EEN BU BUIL ILDING techniques •

Town Center Plan Adopted Town Center Interim Stormwater Dev. Standards Adopted Thompson & Inglewood Sub-Basin Plans Adopted 2008 2010 2011

Town Center Plan Adopted Town Center Interim Stormwater Dev. Standards Adopted Thompson & Inglewood Sub-Basin Plans Adopted Town Center Implementation Strategies Developed 2008 2010 2011 2016 Spring

Town Center Implementation Strategies Short T Sh Term Strategy Resource Allocation Est. Cost Range (Staff/Consultant/ Both) 1. Continue to review/manage/coordinate Town Center development proposals A. Staff A. $425K-$475K A. “Internal” resource allocation through 2018 B. Consultant B. $100K-$150K B. Select and hire a consultant to inform Town Center strategies 2. Review the Transfer of Development Rights (TDR) strategy Staff $0 (part of #1) 3. Begin to plan for non-motorized components of the Town Center Staff/Consultant $0 (part of #1) - Trails 4. Begin regional stormwater analysis Consultant $100K-$150K 5. Continue street/infrastructure planning Staff/Consultant $0 (part of #1) (multimodal connections) Finalize the scope and design of the SE 4 th street project 6. Staff $0 (budgeted) 7. Develop communication strategy Staff $0 (community outreach, CC updates, branding) Consultant $20K-$30K

Town Center Plan Adopted Town Center Interim Stormwater Dev. Standards Adopted Thompson & Inglewood Sub-Basin Plans Adopted Town Center Implementation Strategies Developed Sammamish Storm and Surface Water Management Comp Plan Adopted 2016 KCSWDM Adopted LID Code Amendments Adopted 2016 2008 2010 2011 2016 Spring Fall

Site Information

Town Center Site Information Sub ub-Basins ns a and Stre reams Inglew ewood • Multiple drainage areas • Flows to George Davis Creek Thompso pson • Multiple drainage areas • Flows to Ebright Creek

Town Center Site Information Soils oils an and Top opog ography • Primarily till • Poor infiltration characteristics • Not conducive for full LID D e t e n t i o n Va u l t / P o n d s L o c a t i o n s Va s h o n T i l l ( Q v t ) Va s h o n R e c e s s i o n a l O u t w a s h ( Q v r ) E r o s i o n A r e a s

Regional Stormwater 101

Regional Stormwater “What at is is it it?” Designed to manage • stormwater runof f from multiple projects and/or proper ties Development of ten assists • in financing the facility Requirements for onsite, • privately operated facilities are reduced or eliminated H i s t o r i c Fo u r t h Wa r d P a r k , A t l a n t a G e o r g i a

Why Regional Stormwater? Ad Advanta tages es Improved water quality • Higher assurance of maintenance • Reduced construction costs • Reduced long term maintenance and • operating costs Well-sited regional facilities can ser ve • as a recreational amenity Ensures that the continuity of • P o i n t D e f i a n c e P a r k R e g i o n a l neighborhood character is achieved Tr e a t m e n t Fa c i l i t y, Ta c o m a

Why Regional Stormwater? Dis isad advan antages Timing • Upfront capital costs • Land acquisition • Coordination with multiple • property owners L e a r y Way S t o r m w a t e r Tr e a t m e n t We t l a n d , R e d m o n d

Regional Stormwater Solutions Faci acilit lity M Mod odels City of Bothell • City of Redmond • City of Issaquah • S t o r m w a t e r v a u l t u n d e r n e a t h s t r e e t i n f r o n t o f t h e O v e r l a ke V i l l a g e L i g h t R a i l S t a t i o n , R e d m o n d

Regional Stormwater Models City ty o of Bo Both thell Hor orse se Cr Creek eek Channel: Hybrid open-channel/culver t system • Provides direct discharge to the • Sammamish River Located in downtown corridor • Proj roject Costs: $1 8 million on 20-year bond period • Storm facility connection charge • Annual storm utility rate • 50% capital cost recover y • H o r s e C r e e k – D o w n t o w n B o t h e l l C o n s t r u c t i o n C o m p l e t e d : 2 016

Regional Stormwater Models Cit ity of of Redmo mond Overlake S Sout uth V Vill illage Det etention on Vault ult: 20 acre-feet of storage • Tributar y area of 322-acres • Located in the Overlake Sears • parking lot Proj roject Costs: $ s: $30 m million n City -wide capital and sub-basin • facilities charges Private funding • O v e r l a ke S o u t h V i l l a g e D e t e n t i o n V a u l t 100% capital cost recover y C o n s t r u c t i o n C o m p l e t e d : 2 01 5 •

Regional Stormwater Models City ty o of Issa saquah Issaquah Highla lands: Multiple regional facilities • 1 ,000-acre project area • Located near recreational • amenities Proj roject C Costs: : Facilities paid for by the • developer and transferred to the City I s s a q u a h H i g h l a n d s C o n s t r u c t i o n T i m e f r a m e : 1 9 9 6 - 2 010

Regional Stormwater Models Less ssons L Learned • Establish a clear vision for the project with support from City Council • Anticipate that regional stormwater will attract new development • Design facilities that can be retrofitted/upgraded to meet future stormwater regulations and design standards • Understand that large regional facilities may have special design requirements that need to be considered during the planning phase

Town Center Development Ex Exis istin ing F Faci acilit lities Plateau 120 • The Village at Sammamish • SE Villages • Sammamish Aquatic & Community • Center (SCAC) Lower Commons Rain Gardens •

Town Center Development Potential O ial On-Site te Soluti tions Multiple facilities • Impacts to the overall Town • Center character Increased maintenance and • operation costs Difficult to enforce compliance of • maintenance standards D e t e n t i o n Va u l t / P o n d s L o c a t i o n s E x i s t i n g C o n c e p t u a l

Town Center Development Potential R ial Regio gional al Solu olution ons Optimizes Town Center • character Reduced maintenance costs • Better site integration • D e t e n t i o n Va u l t / P o n d s L o c a t i o n s E x i s t i n g C o n c e p t u a l

Feasibility

Regional Stormwater Design Deten enti tion P Ponds N o r t h M a r y s v i l l e R e g i o n a l Fa c i l i t i e s

Town Center Sub ub-Bas asins • Six proposed basins for Town Center • Analysis provided for Basins A, B and C o Based on priority for development potential o Most feasible basins for regional facilities

Town Center │ Sub-Basin A

Town Center Regional Facility Sub ub-Bas asin A A Trib ibutary B Basin in A Area: 21.89 acres Pon ond A d Area ea: .84 acres P o n d / Va u l t Cos Cost: $7.5 million s h a p e to b e d e t e r m i n e d Dis Discharge: George Davis Creek SE 4 t h St re et

Town Center │ Sub-Basin B

Town Center Regional Facility Sub ub-Bas asin B B SE 4 t h St re et 2 2 2 n d Pl ac e SE Trib ibutary B Basin in A Area: 32.39 acres Pon ond A d Area ea: 1.61 acres Cost: $10.5 million Cos Discharge: Ebright Creek Dis L o w e r e r P o n d / Va u l t C o m m o n s n s s h a p e to b e P a P a r k r k d e t e r m i n e d

Town Center │ Sub-Basin C

Town Center Regional Facility Sub ub-Bas asin C C Trib ibutary B Basin in A Area: 22.32 acres Pon ond A d Area ea: 1.20 acres Cos Cost: $9 million P o n d / Va u l t Dis Discharge: George Davis Creek s h a p e to b e d e t e r m i n e d 2 2 8 T H Ave SE SE 4 t h St re et

Town Center │ Sub-Basin GS

Town Center Regional Facility Sub ub-Basin in GS GS Trib ibutary B Basin in A Area: 5.79 acres Pon ond A d Area ea: .23 acres P o n d / Va u l t Cos Cost: $1.25 million s h a p e to b e d e t e r m i n e d Dis Discharge: SE 4 t h St re et • North Facility - George Davis Creek • South Facility – Ebright Creek

Funding

Regional Stormwater Funding Options Policy Questions: • How will the initial investments in regional stormwater facilities be funded? • Who should pay for regional stormwater facilities? • What is the desired timing for implementation of regional stormwater facilities to support the Town Center?