[PPT] - Gibsons Foreshore & Seawalk Improvements Mini-Charrette - PowerPoint Presentation

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Gibsons Foreshore & Seawalk Improvements

Mini-Charrette - Presentation

Town of Gibsons | October 6, 2016

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Our Team

Consulting Team

Dave Murray, Project Manager, Water Resources Engineer, KWL
David Reid, Facilitator, Landscape Architect, Lanarc
Kate Evans, Landscape Architect, Lanarc
Glenn Hafey, PalegicTechnologies, Marine Construction
Diane Sanford, Moonbeam, Marine Biology

Town of Gibsons

Emanuel Machado, CAO
Andre Boel, Director of Planning
Dave Newman, Director of Engineering

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Agenda

Three Sessions:

1.0 Morning Session = Charrette Participants & Designers 2.0 Afternoon Session = Designers (Optional for Charrette Participants)

3.0 Evening Session = Open House (Charrette Participants, Designers, and Public)

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1.0 Morning Agenda

8:45am Doors Open 9:00am Introductions & Background 9:45am Session A – Clarify Objectives (10:15am)

-- Break ---

10:30am Session B – Design Ideas 11:30am Facilitated Integration – What Design Ideas Where? (12:oopm) --- End of Morning Session ---

(Key stakeholders invited to stay as participants in the “Designer Session”

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2.0 Afternoon Agenda

1:00 pm Session C – Sorting Concepts Into Integrated Design Approach 1:45 am Session D – Production Assignments

As two working groups, each with planner, engineer, and landscape architect/biologist

(4:00 pm)

-- End of Designers Session ---

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Town of Gibsons – Foreshore & Seawalk Improvements | 6

3.0 Evening Agenda

5:00 pm Doors Open to View Display (Informal Discussion) 5:30 pm Presentation

Clarified Objectives, Design Results (Options & Implementation Phasing)

6:15 pm Small Group Discussion of Results

Focused on Questions in a Response Form

6:30 pm Small Group Reporting

Consensus Points and Remaining Issues

7:00 pm Wrap-up & Next Steps

Open House

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Charrette Objectives

Review public input received
Share info on constraints & opportunities
Work creatively to explore all possible solutions
After discussion, integrate the best ideas into two

design concepts.

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Charrette Objectives

NOTE:

Results are subject to more detailed analysis prior to production of formal recommendations.

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Study Area

From Gibsons Wharf to Armours Beach

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Study Area

“generally refers to the area between the natural boundary

f the ocean and the lowest tides”

Foreshore

Access Slope Sewer

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Historical Uses

Lower Gibsons with Tanker at Wharf

(visible: Ballentine Block, Methodist church, Hill's Marine Shop, Marina House & other buildings along waterfront to Armours Beach, c1950)

Wharf at Gibsons Landing

(visible: large crowd waiting for the ferry with some waterfront buildings, c1952)

Photos (#2211, 423, 541) Courtesy of the Sunshine Coast Museum & Archives

Waterfront and Shoreline Buildings

(visible: immediately East of the Wharf looking towards Armours Beach and Soames Hill, c1950)

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Foreshore Today

Part of the marine ecosystem (fish and eelgrass)
Infrastructure servicing corridor (sanitary sewer)
Public recreation trail (oceanfront walkway)

Ecosystem Services for a Range of Uses

Foreshore – Northern End

f Study Area

Foreshore Today

Photo Tour

N

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Eelgrass

Foreshore Today

Environmental Protection

N

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Design Constraints

Sanitary Sewer

Fixed alignment of sanitary sewer in access road
May require eventual replacement

Access (Maintenance and Seawalk)

Riprap protecting the walkway and sewer pipe below is largely

intact but needs upgrade for access

Small section in front of Cole’s Marina– How to upgrade?

Armours Beach

Lock-block retaining wall to be reviewed
Beach area access to be integrated to new foreshore approach

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Design Constraints – Land Tenure/Use

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Environmental Constraints

Physical: Beach slope and size of material (sand, gravel, cobble are critical design constraints Climate Change: Possible storm surge increases Estimated sea level rise of 0.5 m by 2050 and 1.0 m by 2100 Biological: The upper intertidal area is largely devoid of

bservable aquatic life; however, lower tidal has Rockweed and

Sea Lettuce, Mussels, Barnacles, Sea Stars and trace Oyster The backshore area along the public walkway is largely devoid

f any natural riparian vegetation

A fringing and continuous patch of eelgrass appears to be expanding in the nearshore area

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Environmental Constraints

“Meadows of the ocean”

Stabilize shoreline substrates and

moderate shoreline wave action

Serve as a refuge area for marine life,

nurseries and feeding areas, and marine corridors

The harbor in Gibsons was the recipient of

eelgrass transplants in the mid 1980’s

Mapping began in 2005 (to determine the

size and location) and then was updated in 2013

The eelgrass bed has expanded since 2005,

especially along the NW shoreline

Eelgrass

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Regulatory Constraints

Coastal Shore Jurisdiction in BC

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DFO Input

Natural Capital Valuation and Ecosystem services should be

highlighted

Become a coastal community champion!
DFO generally supports GreenShores approach but there will be

trade offs to protect Eelgrass

Ensure forage fish habitat &use are considered in design
Encourage public education through signage/ecosystem services
Good examples are out there and proven
Need an interdisciplinary team on design and implementation
Need a phased approach to support long-term climate change
Strong focus on natural processes
Design lead by core principles/values

Regulatory Approval Required- Review/Authorization

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DFO Input

Preference/recommendation for application of Greenshores approach should be consistent with local/site coastal characteristics, maintenance of Natural foreshore processes and that integrates and balances with maintenance & protection of adjacent, significant Eelgrass beds.

Bottom Line

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GreenShores Approach for Coastal Development

A tool for developing the shore while protecting natural shorelines

and habitats

Guiding principles:
Preserving the integrity or connectivity of shoreline processes
Maintaining or enhancing habitat diversity and function
Minimizing or reducing pollutants to the environment
Reducing cumulative impacts to the shoreline environment

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Future Character?

More natural tree/shrub backshore or More gentle built shoreline?

Future Character?

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Future Character?

How could we apply GreenShores?

Existing Beach Typical Cross Section

Sewer 8H:1V 5H:1V 10H:1V 5H:1V Wave Run-up

2H:1V = 2.3 m 4:1 = 1.14 m 8:1 = 0.6 10:1 = 0.45 m

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Future Character?

How could we apply Greenshores?

Future With SLR- Beach Typical Cross Section Sewer 8H:1V 5H:1V 10H:1V 5H:1V

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Precedents

Examples of restored shorelines
‘GreenShores’ approaches
‘Urban Waterfront’ approaches

Note: the exposure of the Gibsons shoreline to wind and waves will require a customized approach – however these precedents provide general examples of alternative shoreline treatments.

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Jericho Park

BEFORE AFTER

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Kitsilano Beach

BEFORE AFTER

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Spanish Banks

BEFORE AFTER

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Parksville Beach Nourishment

2008

BEFORE AFTER AFTER

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Davis Bay after the March 2012 storm

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GS Ratings Pilot Project #1-

Dick Murphy Park, Campbell River

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Timber wall removal, beach replenishment and planting GS Ratings Pilot Project #1-

Dick Murphy Park, Campbell River

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Lazo Road, Town of Comox

Riprap rock buried and logs balasted

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Sandlance, food for salmon, spawn on beaches

Shore zones support important biological functions

Feeding and resting habitat for migratory birds

R. Hocken
R. Hocken

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Long Term Ideal (2050, 2100 or 2200?)
Short Term Phased Improvements
Now
2030
2050

Adapting to the Future

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Shoreline dikes over 200 years?

Sea Level Rise (SLR)

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Global SLR – gradual increase to high tide
0.5m by 2050, 1.0m by 2100, continues
Natural boundary moves up/inland
Building flood construction level moves up at point of reconstruction/

end of building life – maintain property values.

Gradual shoreline changes over the decades
Allow natural boundary/plants to move up?
Trail to move up as well (in phases over decades)
Eventual dike function?
Change in beach shape changes wave run-up
Can current design accommodate future changes?

Sea Level Rise

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Allow for SLR of 1.0 m + for building lifespans to Yr 2100
Allow for SLR 2.0 m + for building lifespans to Yr 2200

Sea Level Rise (SLR)

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Future Character?

Storms and Sea Level Rise

Flood Level Existing 200 year SLR 2100 High Tide &Storm Surge 2.74 3.74 Wave Effects 1.14 1.14 Freeboard 0.6 0.6 FCL 4.5 5.5

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Future Character?

Consider Eelgrass

Cole’s Marina Cross Section

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Walking / Health
Short-cut Trail / Connections
Access to Beach
Aesthetics
Views to beach / sea
Park upland finish / furniture
Appropriate Character / Feel of this place?

Waterfront Recreation Values

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Future Characte?

Define the parameters

 What design life? 25, 50, 100 years?  What flood level do we chose?  What elevation for walkway/service road?  What storm do we protect against?  Distance from Eelgrass Beds?  Beach slopes and size of material?  Anchored logs?  Beach elevation and will there be vegetation?  Access points? Walkway width? Service road width?  Cost premium and eco asset?

Define Criteria

Eco Asset
Habitat protection
Riparian

enhancement

Aesthetics and

Recreation

Stability
Constructability
Cost

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Session A: Clarify Objectives

1 Minute Introductions!

Name and who you represent
Key idea to put on the table

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Session A: Clarify Objectives

What are key objectives for this

process today, and for this project carrying forward?

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Session A: Clarify Objectives

Safety
Access
Environment
Other?

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Short Break

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1 hour session Reporting back at 11:30:

All ideas considered
Questions uncovered
Sit in two groups
Each group to have one each of engineer,

biologist, landscape architect, and planner.

Sit in a group where you will hear new

ideas and influence people new to you!

Session B: Design Ideas

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Evaluating the Ideas

Values to Consider

Safety of trail use
Accessibility (walking, jogging, cycling, inline skates,

disabled?)

Maximum views of the waterfront
Minimum environmental impact (restoration?)
Reconsider need for seawalls or steep sideslopes?

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Report Back

Key ideas or concepts for consideration?
Remaining questions or points for more

information?

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Idea Integration

What design idea where?

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2.0 Afternoon Agenda

Designers Session

1:00 pm Session C – Sorting Concepts Into Integrated Design Approach 1:45 am Session D – Production Assignments

As two working groups, each with one planner, engineer, and landscape architect

(4:00pm)

-- End of Designers Session ---

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Lunch Break!

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2.0 Afternoon Agenda

Designers Session

1:00 pm Session C – Sorting Concepts Into Integrated Design Approach 1:45 am Session D – Production Assignments

As two working groups, each with one planner, engineer, and landscape architect

(4:00pm)

-- End of Designers Session ---

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Session C: Design Integration

45 minutes
Sit in two groups
Each group to have one each of engineer, biologist,

landscape architect, and planner.

Try to sit in a different group than you did this morning!

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Evaluating the Ideas

Minimize costs of adapting to SLR, and ongoing maintenance.
Maximize opportunities for cost sharing with senior

governments or developers.

Minimize costs of new shoreline.
Consider land impacts of long-term shore protection / dikes.
Gain DFO acceptance.
Other?

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Session D: Concept Production

Until ~4:00pm Break prior to 5:00pm Open House

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