Gibsons Foreshore & Seawalk Improvements

Transcription

1 Gibsons Foreshore & Seawalk Improvements Mini-Charrette - Presentation Town of Gibsons October 6, 2016

2 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, Palegic Technologies, Marine Construction Diane Sanford, Moonbeam, Marine Biology Town of Gibsons Emanuel Machado, CAO Andre Boel, Director of Planning Dave Newman, Director of Engineering

3 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)

4 1.0 Morning Agenda 8:45am 9:00am 9:45am Doors Open (10:15am) --- Break :30am 11:30am Introductions & Background Session A Clarify Objectives Session B Design Ideas Facilitated Integration What Design Ideas Where? (12:oopm) --- End of Morning Session --- (Key stakeholders invited to stay as participants in the Designer Session

5 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 ---

6 3.0 Evening Agenda Open House 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 Town of Gibsons Foreshore & Seawalk Improvements 6

7 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.

8 Charrette Objectives NOTE: Results are subject to more detailed analysis prior to production of formal recommendations.

9 Study Area 9 From Gibsons Wharf to Armours Beach

10 Study Area 10 Foreshore generally refers to the area between the natural boundary of the ocean and the lowest tides Access Sewer Slope

11 Historical Uses 11 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) Waterfront and Shoreline Buildings (visible: immediately East of the Wharf looking towards Armours Beach and Soames Hill, c1950) Photos (#2211, 423, 541) Courtesy of the Sunshine Coast Museum & Archives

12 Foreshore Today 12 Ecosystem Services for a Range of Uses Part of the marine ecosystem (fish and eelgrass) Infrastructure servicing corridor (sanitary sewer) Public recreation trail (oceanfront walkway)

13 Foreshore Today 13 Photo Tour Wharf Southern End of Study Area N

14 Foreshore Today 14 Photo Tour Access/Seawalk Looking South to Wharf N

15 Foreshore Today 15 Photo Tour Access along properties N

16 Foreshore Today 16 Photo Tour Typical foreshore N

17 Foreshore Today 17 Photo Tour Cole s Access N

18 Foreshore Today 18 Photo Tour Cole s Old Marine Railway N

19 Foreshore Today 19 Photo Tour Armours Beach Park and Seawalk N

20 Foreshore Today 20 Photo Tour Armours Beach N

21 Foreshore Today 21 Photo Tour Foreshore Northern End of Study Area N

22 Foreshore Today 22 Environmental Protection Eelgrass N

23 Design Constraints 23 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

24 Design Constraints Land Tenure/Use 24

25 Environmental Constraints 25 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 observable 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 of any natural riparian vegetation A fringing and continuous patch of eelgrass appears to be expanding in the nearshore area

26 Environmental Constraints 26 Eelgrass 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 o The harbor in Gibsons was the recipient of eelgrass transplants in the mid 1980 s o Mapping began in 2005 (to determine the size and location) and then was updated in 2013 o The eelgrass bed has expanded since 2005, especially along the NW shoreline

27 Regulatory Constraints 27 Coastal Shore Jurisdiction in BC

28 DFO Input 28 Regulatory Approval Required- Review/Authorization 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

29 DFO Input 29 Bottom Line 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.

30 GreenShores Approach for Coastal Development A tool for developing the shore while protecting natural shorelines and habitats Guiding principles: o o o o 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 Town of Gibsons Foreshore & Seawalk Improvements 30

31 Future Character? Future Character? More natural tree/shrub backshore or More gentle built shoreline?

32 How could we apply GreenShores? Existing Beach Typical Cross Section Future Character? Wave Run-up 2H:1V = 2.3 m 4:1 = 1.14 m 8:1 = :1 = 0.45 m Sewer 5H:1V 10H:1V 5H:1V 8H:1V

33 How could we apply Greenshores? Future With SLR- Beach Typical Cross Section Future Character? Sewer 5H:1V 10H:1V 5H:1V 8H:1V

34 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. Town of Gibsons Foreshore & Seawalk Improvements 34

35 Jericho Park BEFORE AFTER Town of Gibsons Foreshore & Seawalk Improvements 35

36 BEFORE Kitsilano Beach AFTER Town of Gibsons Foreshore & Seawalk Improvements 36

37 Spanish Banks BEFORE AFTER Town of Gibsons Foreshore & Seawalk Improvements 37

38 Parksville Beach Nourishment 2008 BEFORE AFTER AFTER Town of Gibsons Foreshore & Seawalk Improvements 38

39 Davis Bay after the March 2012 storm Town of Gibsons Foreshore & Seawalk Improvements 39

40 GS Ratings Pilot Project #1- Dick Murphy Park, Campbell River Town of Gibsons Foreshore & Seawalk Improvements 40

41 GS Ratings Pilot Project #1- Dick Murphy Park, Campbell River Timber wall removal, beach replenishment and planting Town of Gibsons Foreshore & Seawalk Improvements 41

42 Lazo Road, Town of Comox Riprap rock buried and logs balasted Town of Gibsons Foreshore & Seawalk Improvements 42

43 Shore zones support important biological functions Sandlance, food for salmon, spawn on beaches R. Hocken R. Hocken Feeding and resting habitat for migratory birds Town of Gibsons Foreshore & Seawalk Improvements 43

44 Adapting to the Future Long Term Ideal (2050, 2100 or 2200?) Short Term Phased Improvements Now

45 Sea Level Rise (SLR) Shoreline dikes over 200 years?

46 Sea Level Rise 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?

47 Sea Level Rise (SLR) 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

48 Storms and Sea Level Rise Future Character? Flood Level High Tide &Storm Surge Existing 200 year SLR Wave Effects Freeboard FCL

49 Consider Eelgrass Cole s Marina Cross Section Future Character?

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

51 Future Character? Future Characte?

52 Future Character? Future Character?

53 Future Character? Future Character?

54 Future Character? Future Character? More natural tree/shrub backshore or More engineered and built shoreline?

55 Design Criteria 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? Future Characte? 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

56 Session A: Clarify Objectives 1 Minute Introductions! Name and who you represent Key idea to put on the table

57 Session A: Clarify Objectives What are key objectives for this process today, and for this project carrying forward?

58 Session A: Clarify Objectives Safety Access Environment Other?

59 Short Break

60 Session B: Design Ideas 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! 1 hour session Reporting back at 11:30: All ideas considered Questions uncovered

61 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?

62 Report Back Key ideas or concepts for consideration? Remaining questions or points for more information?

63 Idea Integration What design idea where?

64 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 ---

65 Lunch Break!

66 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 ---

67 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!

68 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?

69 Session D: Concept Production Until ~4:00pm Break prior to 5:00pm Open House

70 Break until Evening Session (Session 3)