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

Introduction to Regional Stormwater

City Council Meeting April 3, 2017

Town Center

Meeting Agenda

What w we’re re w work rking ng o

• n
• Project Background
• Site Information
• Regional

Stormwater 101

• Feasibility

.

Preliminary Site Feasibility Implementation Plan

Project Background

Town Center Plan Adopted

2008 2010

Town Center Regulations Adopted

Stormwater Development Standards (2010)

• 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

Goals Goals

Town Center Plan Adopted

2008 2010

Town Center Interim Stormwater Dev. Standards Adopted

2011

Thompson & Inglewood Sub-Basin Plans Adopted

Town Center Plan Adopted

2008 2010

Town Center Interim Stormwater Dev. Standards Adopted

2011

Thompson & Inglewood Sub-Basin Plans Adopted

2016

Town Center Implementation Strategies Developed Spring

Strategy Resource Allocation (Staff/Consultant/ Both)

• Est. Cost Range

1. Continue to review/manage/coordinate Town Center development proposals

• A. “Internal” resource allocation through 2018
• B. Select and hire a consultant to inform Town Center strategies
• A. Staff
• B. Consultant
• A. $425K-$475K
• B. $100K-$150K

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

• Trails

Staff/Consultant $0 (part of #1) 4. Begin regional stormwater analysis Consultant $100K-$150K 5. Continue street/infrastructure planning (multimodal connections) Staff/Consultant $0 (part of #1) 6. Finalize the scope and design of the SE 4th street project Staff $0 (budgeted) 7. Develop communication strategy (community outreach, CC updates, branding) Staff Consultant $0 $20K-$30K

Town Center Implementation Strategies

Sh Short T Term

Town Center Plan Adopted

2008 2010

Town Center Interim Stormwater Dev. Standards Adopted

2011

Thompson & Inglewood Sub-Basin Plans Adopted

2016

Sammamish Storm and Surface Water Management Comp Plan Adopted 2016 KCSWDM Adopted LID Code Amendments Adopted

2016

Town Center Implementation Strategies Developed 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

• ils an

and Top

• pog
• graphy
• 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

• 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

Regional Stormwater

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

“What at is is it it?”

Why Regional Stormwater?

• Improved water quality
• Higher assurance of maintenance
• Reduced construction costs
• Reduced long term maintenance and
• perating costs
• Well-sited regional facilities can ser ve

as a recreational amenity

• Ensures that the continuity of

neighborhood character is achieved

Ad Advanta tages es

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 Tr e a t m e n t Fa c i l i t y, Ta c o m a

Why Regional Stormwater?

• Timing
• Upfront capital costs
• Land acquisition
• Coordination with multiple

property owners

Dis isad advan antages

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

Faci acilit lity M Mod

• dels
• City of Bothell
• City of Redmond
• City of Issaquah

Regional Stormwater Solutions

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

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

City ty o

• f Bo

Both thell

Hor

• rse

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

• n
• 20-year bond period
• Storm facility connection charge
• Annual storm utility rate
• 50% capital cost recover y

Regional Stormwater Models

Overlake S Sout uth V Vill illage Det etention

• n 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
• 100% capital cost recover y

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 C o n s t r u c t i o n C o m p l e t e d : 2 01 5

Cit ity of

• f Redmo

mond

Regional Stormwater Models

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

City ty o

• f 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

Regional Stormwater Models

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
• peration 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

• lution
• ns
• 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

• Based on priority for

development potential

• 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

• nd A

d Area ea: .84 acres Cos Cost: $7.5 million Dis Discharge: George Davis Creek

SE 4 t h St re et

P o n d / Va u l t s h a p e to b e d e t e r m i n e d

Town Center │ Sub-Basin B

Town Center Regional Facility

Sub ub-Bas asin B B

Trib ibutary B Basin in A Area: 32.39 acres Pon

• nd A

d Area ea: 1.61 acres Cos Cost: $10.5 million Dis Discharge: Ebright Creek

SE 4 t h St re et

P o n d / Va u l t s h a p e to b e d e t e r m i n e d L o w e r e r C o m m o n s n s P a P a r k r k

2 2 2 n d Pl ac e SE

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

• nd A

d Area ea: 1.20 acres Cos Cost: $9 million Dis Discharge: George Davis Creek

SE 4 t h St re et 2 2 8 T H Ave SE

P o n d / Va u l t s h a p e to b e d e t e r m i n e d

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

• nd A

d Area ea: .23 acres Cos Cost: $1.25 million Dis Discharge:

• North Facility - George Davis Creek
• South Facility – Ebright Creek

SE 4 t h St re et

P o n d / Va u l t s h a p e to b e d e t e r m i n e d

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?

Financial Plan

Fund nding ng O Options ns

• Private/Public Partnership
• Local Improvement District
• Utility Local Improvement District
• Community Facilities District
• Councilmanic or Capital Bond
• Stormwater Fund Rates and System Development Charges
• Developer Driven
• Latecomers Agreements
• Grants and Loans
• Community Revitalization Financing

Council Direction

Council Direction

Plan lannin ing

• Should staff continue

analyzing Town Center sub- basins A, B, C, and GS?

• Should staff also analyze

Town Center sub-basins D and E?

Council Direction

• What are the potential source(s) of funds that will be used to cover

design and construction costs for a regional stormwater system in Town Center?

• What share of these costs, should be paid by the general stormwater

ratepayer?

• What share of these costs, should be paid by the developer and/or
• thers?
• Would Council like staf f to fur ther explore these financing options?
• What additional information would Council like staf f to provide

regarding the potential implementation of a regional stormwater system in Town Center?

Plan lannin ing

Next Steps

Preliminary Site Feasibility Implementation Plan

• Project Background
• Site Information
• Regional

Stormwater 101

• Feasibility

.

Regional Stormwater Analysis

Next S t Steps eps

• Engaging developers

& stakeholders

• Identify par tnership
• ppor tunities
• Facility design

analysis

• Explore financing
• ptions

Discussion