Post on 26-Oct-2014
description
To:
From:
City of Richmond
Public Works and Transportation Committee
John Irving, P.Eng . MPA
Director, Engineering
Re: Dike Master Plan - Phase 1
Staff Recommendation
Report to Committee
:l'2 ¥1&'T -JiJ,lq IB:.?G12-
Date: June 27, 2012
File: 10-6060-01/2012-Vol
01
That the public and key external stakeholders be consulted to provide feedback on the Steveston
area and the West Dike flood protection concepts identified in the attached staff report from the
Director, Engineering.
John Irving, P.Eng. MP
Director, Engineering
(604-276-4140)
Art. 3
ROUTED To:
Real Estate Services Sustainability
Roads and Construction
Sewerage and Drainage
Parks Development Applications Policy Planning
Transportation
REVIEWED BY SMT
SUBCOMMITTEE
3553300
REPORT CONCURRENCE
CONCURRENCE CONCURRENCE OF GENERAL MANAGER
/
:: ' t'''y REVIEWED BY CAD INITIALS;
l\!X /'
CNCL - 371
June 27, 2012 - 2 -
Staff Report
Origin
The 2008 - 2031 Richmond Flood Protection Strategy identified the need to "Prepare and
implement a comprehensive dike improvement program". On June 13,2011 Council approved
that $200,000 of surplus from the 2010 operating budget be used to initiate a Dike Master Plan. This budget is being used to fund Phase 1 of the mastcr plan, which is primarily focused on
identifyi ng a long term flood protection improvement plan for the Steveston and southern West Dike area.
The purpose of this staff report is to present preliminary concepts for flood protection works "18t
will be required to address long-term sea levc\ rise and future flood risks.
Analysis
Richmond has grown into a large thriving City with considerable assets to protect. Directed by the 2008 - 2031 Richmond Flood Protection Strategy, the Drainage and Diking Utility was
created to fund the construct ion, operation and maintenance of City dikcs, drainage pump
stations and drainage conveyance systems that protect the City against floods. The Drainage, Dike and Sanitary System Bylaw No 7551 and Watercourse Protection and Crossing Bylaw No.
8441 regulate drainage activities to minimise the risk of flooding inside of the City's dike. The
Flood Plain Designation and Protection Bylaw No. 8204 prevents development from encroaching onto dikes and requires that allncw finished floor areas susceptible to flood damage be above the
flood plain construction level.
The Dike Master Plan is intended to be a comprehensive guide to upgrade flood protection
infrastructure to:
• Adequately protect Richmond from both ocean stonn surges and Fraser River freshet
events,
• Adapt to sea level rise,
• Meet appropriate seismic and other design standards,
• Follow the five strategic directions of the City's 2009 Waterfront Strategy, and
• Prioritize dike improvement phasing to effi ciently use resources.
Sea and river dikes form the backbone of Richmond's flood protection infrastructure. As a Local Diking Authority the City of Riclunond manages the integrity of 49 km of dike on Lulu and Sea
Islands. Tn the medium to long tenn, dike crest elevations will need to be raised to mitigate sea
level rise caused by climate change.
Richmond's dikes are located in City right-of-ways, City owned land, Federal/Provincial Land
and private land. Land ownership and land use issues create a number of challenges that the City must address as dike crest elevations are raised. Creating a long-term dike master plan for the
Steveston area has been identified as a priority. The Steveston dike impacts many things, for example, existing roads and buildings, heritage structures, harbour funct ionality and Steveston
Village's unique character. Development is also hindered without a long-term master plan.
Actual implementation of any approved master plan would occur over many decades as the identified sea level risk wi ll largely materialize beyond the 50-year timeline.
CNCL - 372
June 27, 20 12 - 3 -
The City has engaged DeicanJDI-IV as the lead consultant to complete Phase 1 of the Dike
Master Plan. Tasked with identifying traditional and creat ive flood protection solutions that have
minimal impact, Delean has identified two primary dike alignments between Garry Point Park
and London Farm: I) raising the dikes in their current or similar alignment, or 2) using Steveston
(Shady) Island to form a new dike stmcturc. These alignments are illustrated in Attacbment 1
and are explained below.
Primary Alignment 1: Raise dikes in their current alignment or a close parallel alignment on
Lulu Island
Raising dikes in their current location presents a number of challenges that include limited space,
uti lity conflict, development conflict and construction scheduling. Leaving dikes in their ex isting
alignment also excludes a number ofpropel1ies from current and future fl ood protection.
Attacbment I shows the dike di vided into a number of reach boundaries (sections). Within each
reach the dike' s current alignment as well as some proposed alternative alignment options arc
shown.
Attachment 2 presents a series of dike alignment options w ithin each reach boundary. Options
vary with location and seismic design cons iderations . For reasons relating mainly to land
ownership, land use and heritage preservation, dike alignment options are presented that exclude
some City, Provincial and Federal property from fl ood protection. Should these alternatives be
chosen and property is left outside of the Ci ty's main dike the property owners could use a
number of strategies to prevent local flood danlage that include changing property and building
usage, raising building elevations, raising ground elevations or constructing private flood wa ll s.
Moving the dike closer to the water's edge presents challenges and would significantly change
the look and feel of the existing harbour and potentially di srupt sensitive shoreline ecology. In
some areas sheet pile walls with backfilled dike material will likely be required to create a
seismically stable dike that is capable of meeting today's dike crest planning elevation (4.7 m
geodetic is used in this study) and those required further into the futlITe.
Primary Alignment 2: Raise a dike on Steveston Island and install gate structures to enclose the
harbour
This al ignment uses a simi lar layout to the Steveston Community Fishing Harbour Long Term
Development Plan that is proposed under the City'S Waterfront Strategy Implementation Plan.
However, while the Community Fishing Harbour Plan is envisaged to have two clear openings at
each end of the Harbour' s channel, this alternative would use gates or other structures that would
close the channel during combined high tides and storm surge events. Assuming that water
quality can be maintained, another option is to completely close the channel at its east end. The
implications of fu ll enclosure on dredging needs has not yet been anaJysed. Similarly, the
ecological impacts on ex isting wetlands located within and east o f the harbour and authorization
from Federal Agencies in relation to ecologica l, First Nations, and/or fisheries values have not
yet been evaluated.
Primary Alignment 2 (Attachment 3) shows that the proposed dike would begin somewhere
west of71h Avenue where a new structure would be built heading South into the Steveston
Harbour that would intersect the west end of Steveston Island. At this point, Stcveston Island
would be modified along its entire length to form a dike. Additional structures or embankments
would then be needed to enclose the Harbour approximately 250 m east of No.2 Road. At its CNCL - 373
June 27, 2012 - 4 -
west end, a gate structure would be built to close off the Harbour during periods of combined
storm surge and high tide. A pump station may also be required to ensure stable water elevations
during closure periods. Attachment 3 shows renderings that have previously been presented to
Council of the Steveston Community Fishing Harbour Long Term Development Concept. The
renderi ng has been modified to show the compatibil ity of the dike development concept with the
Integrated Flood Protection Strategy.
Option Comparison
In preparation for stakeholder discussions, Table J makes a preliminary comparison of the pros
and cons of Primary Alignment 1 versus Primary Alignment 2.
The two primary alignments are not exclusive of each other. E lements of each could be used
over time to provide a complete fl ood protection package.
Table 1. T he pros and cons of Primary Alignment 1 versus Primary Alignment 2
Primary Alie:nment I Lulu Isla nd Primary Ali rnment 2 Sieves ion Isla nd
Topic Pros I Cons Pros I Cons
Cost Neutra l - initial cost est imates are similar for both options
Property and City owns land and Ex isting structures Steveston Island is Government
Land Usc right o f ways for must be vacant o f jurisdiction issues
some options accommodated development with land use
Construction Can bu ild in pieces High community Low community Must be built as one
and use tem porary disruption disnlption project to be effect ive
infrastructure for
effective flood
protectio n
Adaptabilit)' to Will disturb the Relatively easy to
FutUre Raising com mu nity if raised raise in the future
in the fu ture
Environmental Needs further assessment
Geotechnical Ground Minimises ground
Implicatio ns improvement may improvement
impact existing impacts to ex isting
bui ld ings and bu ildings and
in frastruc ture infrastructure
Commu nity High impact on Minim ises the
impact existing village impact on village
character & heritage character and
assets heritage assets.
Aligns with the
Steveston Harbour
Authority Concept
0pcl'atioll and Design resemb les The replacement Ma intenance can be A harbour gate
Maintenance existing or cost of sheet pile achieved w ith lillIe requires new O&M
traditional sections is high. impact to the loca l procedures with
infrastructure for Maintenance may community additional short and
relatively simple impact the local long tenn costs
O&M com munity
Roadway Disrupt ion likely for No disruption
Disruptions some options
CNCL - 374
June 27, 2012 - 5 -
Sturgeon Bank. Roberts Bank and River Training Structures
The existing river training structures (rock groynes and timber pilings) at the Fraser River's
mouth and the extensive Sturgeon Bank mud fl ats protect Richmond's West Dike and the
Steveston arca from large waves that develop in the Georgia Strait. As sea levels rise water
washing over these areas will become deeper and the current level of wave protection will be
reduced.
Sediment deposition and erosion on Sturgeon Bank occurs due to a multitude of factors that
changed significantly through the 19th
Century. Tidal drift, river dredging and river training
structures all impact sedimentation in the Fraser River Delta. It is unclear how current
sedimentation patterns will effect Sturgeon Bank's ability to mitigate wave action, however, any
net erosion is anticipated to exacerbate the loss of wave protection caused by rising sea levels.
The maintenance and enhancement of river training structures is anticipated to help protect
Richmond from waves and wi ll also benefit shipping and local harbour activities. As is now
being practiced around the world, beach nourishment (the addition of sand and sediment to a
"beach") may be used to grow mud flat and sand banks to restore (e.g. New Orleans, Louisiana)
or enhance (e.g. ocean beaches, The Netherlands) wave protection. Although its effectiveness in
the Fraser River Delta is not yet understood, the careful planning of beach nourishments may
mitigate wave action from the Georgia Strait and benefit the natural envirolUnent (Steveston
Island is partially manmade which over the last 50 to 100 years has changed from a low lying
sand bank into its current make up of trees, plants and intertidal beaches that support an
abundance of wildlife). Sturgeon Banks arc currently designated as Provincially protected for
their high well and ecological value and migratory bird habitat.
Reach 8, Options B and C (Attachment 2) indicate how elevating Sturgeon Bank or creating a
chain of islands along it (similar to Steveston Island) could reduce current and future wave action
on the west dike that would minimise future dike crest elevation upgrades.
Next Steps
Staff plan to gain feedback from key stakeholders and the public. Key stakeholders include:
• Steveston Harbour Authority
• Small Craft Harbours
• Port Metro Vancouver
• Department of Fisheries and Oceans
• Be Inspector of Dikes
• Gulf of Georgia Cannery Society / Parks Canada
• Britannia Heritage Shipyard Socicty
• Heritage Advisory Committee
• Advisory Committee on the Environment CNCL - 375
June 27, 2012 - 6 -
The key stakeholder group will be engaged through ongoing meetings and communications.
Public consultation would include two public open houses held before the end of September.
Financial Impact
None.
Conclusion
Consistent with the City ' s 2008 - 203 1 Richmond Flood Protection Strategy, Phase I of a Dike
Master Plan is being prepared. Two primary dike al ignments in the Steveston arca as well as
wave mitigation strategies for the southern West Dike area have been prepared for key
stakeholder consultation. Staff plan to engage stakeholders so that they may provide input into
dClcmlining a preferred fu ture dike alignment in the Stevcston area.
Lloyd ie, P.Eng.
Mana er, Engineering Planning
(604-276-4075)
LB: lb
/(5pt Andy Bell, P.Eng., M.Eng.
Project Engineer, Engineering Planning
(604-247-4656)
CNCL - 376
I
1
\
; f
Attachment I
E
§
8
0
§ 0
I I I .
d I I
CNCL - 377
Future Design Stonn Surge & Waves
Current Design
•. 0 Stonn Surge & Waves
'" I" 4.0
z
'" 0.0
-2.0
, , 0 10
, 20 30
Future expandabillty
Attachment 2
I earth Dike
Denstry ground for .elsmlc stabtlfty
40 50
LEGEND Flood Protection CURRENT DIKE ALIGNMENT
PRIMARY ALIGNMENT 1 • LULU ISLAND ALIGNMENTS
PRIMARY ALI GNMENT 2 · STEVESTON ISLAND
REACH BOUNDARIES
FEDERAUPROVINCIAL OWNED LAND
CITY OWNED LAND
----I + + + + +1
Improvement Alternatives
Reach 1: London/Princess
Option A
EB3763 July 201 2 CNCL - 378
Current Oeslgn Storm Surge &
8.0 Waves
a 0.0
;;;
-2.0
.Iope facti for •• Ianle ."blilly. WllYe dissipation & to raise riparian wetland. In paee with sea level rise
, " '"
LEGEND:
CURRENT DIKE ALIGNMENT
PRIMARY ALIGNMENT 1 - LULU ISLAND ALIGNMENTS
PRIMARY ALIGNMENT 2 - STEVESTON ISLAND
REACH BOUNDARIES
FEDERAUPROVINCIAL OVv'NED LAND
CITY OVv'NED LAND
30
----I + + + + +1
t t t + +
Future expandability
'" Flood Protection
Improvement Alternatives
Reach 1: London/Princess
Option B
EB3763 July 2012 CNCL - 379
Future Design Storm Surge & Waves
Current Oaslgn Storm Surge &
waves Future expandability
Sheet Pile /
/ / Ll 1
.Je , -II i
__ 8.0
4.0
"' 0.0
__ '
g -40
al -8.0
++-__ Dent.tfy ground for .... mlc stabil ity
LEGEND:
CURRENT DIKE ALIGNMENT
PRIMARY ALIGNMENT 1 - LULU ISLAND ALIGNMENTS
PRIMARY ALIGNMENT 2 - STEVESTON ISLAND
REACH BOUNDARIES
FEDERAUPROVINCIAL OWNED LAND
CITY OWNED LAND
---------I + + + + +1
+ t t t t
Flood Protection
Improvement Alternatives
Reach 2: Paramount
Option A
EB3763 July 2012
CNCL - 380
Current Future Design De&lgn Stonn Stonn Surge &
I:: .. 'd .. '_b_lli_t'J_l
il 0"0 "------,
"
" 0 .," .... -8.0
___ Density ground for
seismic stability
o
LEGEND:
CURRENT DIKE ALIGNMENT
PRIMARY ALIGNMENT 1 • LULU ISLAND ALIGNMENTS
PRIMARY ALIGNMENT 2 - STEVESTON ISLAND
REACH BOUNDARIES
FEDERAUPROVINCIAL OWNED LAND
CITY OWNED LAND
-----------I + + + + +1 + * * t t
Flood Protection
Improvement Alternatives
Reach 2: Paramount
Option B
EB3763 July 2012 CNCL - 381
8.0
-4.0
Current Design Stonn Surge & Waves
Future Design Stonn Surge &
aves Future Standard expandabllIty Setback Earth I
! Dike r r _________ nh . /'
__ l(.. -·8.0
100 110 ,20 130 140 o 10 20 L,--J Existing Setback Dike In Port land
I New Dike ROW
LEGEND:
CURRENT DIKE ALIGNMENT
PRIMARY ALIGNMENT 1 • LULU ISLAND ALIGNMENTS
PRIMARY ALIGNMENT 2 - STEVESTON ISLAND
REACH BOUNDARIES
FEDERAUPROVINCIAL OWNED LAND
CITY OWNED LAND
---------
Flood Protection
Improvement Alternatives
Reach 2: Paramount
Option C
EB3763 July 2012
CNCL - 382
Cu"ent Design
• ), 0000 !
Future Design :l Stonn Surge & Future expandabilily
Storm Surge & Waves
Waves
_ 80 \
4.0
10 0.0
z Ie< 0 -4.0
-8 .0 w
0 10 30 I
New Dike ROW
LEGEND:
CURRENT DIKE ALIGNMENT
PRIMARY ALIGNMENT 1 - LULU ISLAND ALIGNMENTS
PRIMARY ALIGNMENT 2 - STEVESTON ISLAND
REACH BOUNDARIES
FEDERAUPROVINCIAL OWNED LAND
CITY OV\ft"lED LAND
100 11 0
---------t + + + + +1
+ ± + + * I
1 i' r ['---'I
J I [
II J - " .. .. ..
120 130 140
Flood Protection
Improvement Alternatives
Reach 2: Paramount
Option D
EB3763 July 2012
CNCL - 383
Future Design Stonn Surge & Waves
. "
LEGEND:
Raise or Floodproof Structures
Cumtnt Design Outside of Dike Storm Surge & \ Wave.
"
CURRENT DIKE ALIGNMENT
PRIMARY ALIGNMENT 1 - LULU ISLAND ALIGNMENTS
PRIMARY ALIGNMENT 2 - STEVESTON ISLAND
REACH BOUNDARIES
FEDERAUPROVINCIAL OWNED LAND
CITY OVVNED LAND
" &0 >0
Raise Of'
Floodproof Structures Outside of Dike
'"
Future expandabllity
Earth Fill Dike Wide, Flat and Setback For Stability
I
Existing Dike ROW
----
Flood Protection
Improvement Alternatives
Reach 3: Britannia
Option A -----
EB3763 July 2012
CNCL - 384
RAISE BUILDINGS
Current D.slgn Storm Surge & Wavelli
LEGEND:
Rals. or Floodproof Future Design Structures Outside of
Storm Surge & Dike Waves
CURRENT DIKE ALIGNMENT
PRIMARY ALIGNMENT 1 - LULU ISLAND ALIGNMENTS
PRIMARY ALIGNMENT 2 - STEVESTON ISLAND
REACH BOUNDARIES
FEDERAUPROVINCIAL OWNED LAND
CITY OVJNED LAND
o \:4000 ! " !
"oe' Pile
Future expand.bUlty
---------
Flood Protection
Improvement Alternatives
Reach 3: Britannia
Option B
EB3763 July 2012 CNCL - 385
• • ......
...... ...... ---.. ......
Earth Fill with densificatlon
Future Design Current
Storm Surge Design & Waves Storm
Surge &
Wave.
expandabUlty
! Future
LEGEND:
8.0
i 4 .0
_ 0 ,0
·'.0
-8.0
o
CURRENT DIKE ALIGNMENT
10
....... .1 . '.
20 '0 50
I New Dike ROW
PRIMARY ALIGNMENT 1 - LULU ISLAND ALIGNMENTS - - - -
PRIMARY ALIGNMENT 2 - STEVESTON ISLAND
REACH BOUNDARIES - - - - -
FEDERAUPRQVINCIAL OWNED LAND
CITY OWNED LAND
I + + + + +1 t + * * t
70 80 9Q
Flood Protection
Improvement Alternatives
Reach 4: Be Packers
EB3763 July 2012 CNCL - 386
iii • .. 4.0
A ••
5 o
LEGEND:
Future Deslg" Stonn Surge &
W ......
Cumnl De.llln Stonn Surge & Wav ••
CURRENT DIKE AliGNMENT
Signifi.::.n! wawolln Harbour
PRIMARY ALIGNMENT 1 • LULU ISLAND ALIGNMENTS
PRIMARY ALIGNMENT 2 - STEVESTON ISLAND
REACH BOUNDARIES
FEDERAUPROVINCIAL OWNED LAND
CITY OVIfNED LAND
Railing. waterproofing, and/or ero.lon protection by property owne .... .t their rhlk
Future elqMnilon
----t ... ... ... ... "' I * t + t +
, III
Flood Protection
Improvement Alternatives
Reach 5: Steveston Village
Option A
EB3763 July 2012 CNCL - 387
1 i:: ••• , . -LO , oJ _a. Q
LEGEND:
FutUAI OHlg" Storm Surge
" W.V1tS
No Impl'Cl'Mme""to 1.land (Albion dike. Of S. Jetty)
•
CURRENT DIKE ALIGNMENT
I
SlgnlfiCllnl w.v •• ln Harbour
I
..... '"
N .. Dlk,ROW
Deonslfled fill " .... ;:hOl'1l
PRIMARY ALIGNMENT 1 • LULU ISLAND ALIGNMENTS ----PRIMARY ALIGNMENT 2 - STEVESTON ISLAND _____ _
REACH BOUNDARIES
FEDERAUPROVINCIAL OWNED LAND
CITY OWNED LAND
t + + + + +1 ± * + + +
'"
' :4000 t. !
-----'"
Dike backed by ... aM, tlglll. seismically atllblllzed foundatlon l with r.dtIwlopmant
Flood Protection
Improvement Alternatives
Reach 5: Steveston Village
Option B
EB3763 July 2012 CNCL - 388
1:4000
Current Design F Future Design StormSurge& uture
.. • jW,.'.'." .. _ .......... , expandabUlly
u> 4.0 100 r-j[.-. ...... __ , --...-.
I
1 1
Il'; F: " In-"' 11 J " I " - .. -
z
i 4 0
Shoo< Pile W -6.0
o w I
New Dike ROW
LEGEND:
CURRENT DIKE ALIGNMENT
180 , 200 220 1 I
Existing Dike ROW
PRIMARY ALIGNMENT 1 - LULU ISLAND ALIGNMENTS - - - -
PRIMARY ALIGNMENT 2 - STEVESTON ISLAND
REACH BOUNDARIES - - - --
FEDERAUPROVINCIAL OWNED LAND
CITY OWNED LAND
''''' '60
Flood Protection
Improvement Alternatives
Reach 6: Gulf of Georgia
EB3763 July 2012
CNCL - 389
CUrrent Design Storm Surge &
Waves
8'
i 4.0
0 .0 z
-4.0
-8.0
LEGEND:
, 10
CURRENT DIKE ALIGNMENT
Future Design Storm Surge & Waves
JO
Setback Dike Leaves Park Space Vulnerabkt 10 Occasional Inundation in the Long
50 60
Earth Fill Dike Wide Flat and Setback Future
r---'" ... '"
80 60
PRIMARY ALIGNMENT 1 - LULU ISLAND ALIGNMENTS - - - _
PRIMARY ALIGNMENT 2 - STEVESTON ISLAND
Flood Protection
Improvement Alternatives
Reach 7: Garry Point REACH BOUNDARIES - - - - -
FEDERAUPROVINCIAL OWNED LAND
CITY OWNED LAND
I + '" '" '" "'I ± * * t t
I EB3763 July 2012
CNCL - 390
8.0
4.0
0.0
-4.0
-8.0
+ + + • •
.. .. .. + t .. .. ..
ftt.+ ••• fttttttt +tt .. ,. .. +
.++i-+++t •
" •• ++t .... +++++t++
ft+tft ...
.. .. .. .. .. .. .. + t .. .. .. .. .. .. +
t .. .. .. .. .. .. + t .. .. .. .. .. .. ..
.. .. .. .. .. .. .. + tt+t.+++ .. .. .. .. .. .. .. ..
Future Design Storm Surge &
Waves
Current
Design Storm Surge &
Waves
• • • .. .. .. + • • •
• • • • .. .. .. +
t .. .. .. + .. .. .. ... t .. .. +- + tt+.t.
t .... .......... + • • • tt fttt+.
• .. .. .. .. .. .. .. .. t
• tt ++++++++
• • • .. .... .............. + .. + tt +t++ ....... +
to. ++++++++++ ++ ft ......... ++.
++ •• +t++.+.+. .... • t ... tt.+++. ..... + .. +t+ ......
+ +t++++".++t .. ++ +++++++++++
.. ftft.+ ... ++. ++ .ft+t+.+ ++
• • •
Toe Berm for
Wave Dissipation
Future expandablllty
/Wlde, Flat - / _ Earth Dike -----
• o.ntllIy ground for --- seismic stability
o 10 20 30 40 50 60 70 60
LEGEND:
CURRENT DIKE ALIGNMENT
PRIMARY ALIGNMENT 1 - LULU ISLAND ALIGNMENTS
PRIMARY ALIGNMENT 2 - STEVESTON ISLAND
REACH BOUNDARIES
FEDERAUPROVINCIAL OWNED LAND
CITY OWNED LAND
----I + + + + +1
t ± * * t
Flood Protection
Improvement Alternatives
Reach 8: West Dike
Option A
EB3763 July 2012 CNCL - 391
8.0
_ 4.0
I 0.0
-4.0 ;,
".0
LEGEND:
a
+ • +
.-+ .... . ...... .. .. .. .. .. .. .. .. ++++++
+ .. .. .. .. .. .. .. ++++++ •
• • + +
• .. .. .. oj- ..
• + + • • + +
• + •
+ • •
+ • •
+ • + + •
• +
.. .. .. .. .. +++++++
• • • .. .. .. .. .. .. .. .. +++++++
+ +
+ +
• • +
• + •
+ +
• • •
+ + + +
+ • + '
• • • • •
• •
•
+
+
+ + +
+++++ ++ ++++++++ .. .. .. .. .. .. .. .. .. ..
++ .. ++++++++ .. .. ... .. .. .. .. .. .. .. .. .. .. .. ... .. ... .. .. .. .. ++++++++++++ .. .. .. .. .. .. .. .. .. .. .. ++++++++++++ ++++++++++ +
• • •
.+ •• + •• + ••• • ....... + ...... ++++++++++
+++++++++++ ++++++++'t+
• • .. .. .. .. .. .. .. . .. .. .. .. .. .. .. ..
++++++++
• +
• + .............. ... .. t- .................. " ....
+++++++++ +++++ ++ ..
_--J-'--'- ••• • •
Future Design Stonn Surge & Waves
Natural or Enhanced Sedimentation & Rise In Sturgeon Banks Coinciding with SLR
Stonn Surge & Waves
Toe Berm for Wave Dissipation Future
expandability
/W1de,Flat _ / Earth Dike
-- -
10 20 30 40 50 60
Raise where compatible with redevelopment
70 80
CURRENT DIKE ALIGNMENT Flood Protection
Improvement Alternatives
Reach 8: West Dike
Option B
PRIMARY ALIGNMENT 1 - LULU ISLAND ALIGNMENTS
PRIMARY ALIGNMENT 2 • STEVESTON ISLAND
REACH BOUNDARIES
FEDERAUPROVINCIAL OWNED LAND
CITY OWNED LAND
----I + + + + +1 1* * * * *
EB3763 July 2012
CNCL - 392
8,0
+++++++ .. '!:...-t ... .. •
... .... +
............ ",".IIi,.,- .. +
++++ ... +++ .. .. .. .. .. .. .. +
.. .. .. .. .. .. .. + .. .. .. .. .. .. .. .
.. .. .. .. .. .. .. + .. .. .. .. .. .. . ++++++++
+++++ ..... -"-'---"-- .. ... ... Jt
BARRIER ISLANDS,
BREAKWATER
Future Design Current Storm Surge & Design
• • +++++++++
I··· .. ····· .. ++++++++++++++ 1+ .......................... + .. .. f .. .. .. .. .. .. .. .. .. .. .. +
+++++++++++++++ .. .. ........ .. .. .. .. +
.. .. .. .. .. .. .. .. .. .. .. .. +
•·:'If .. ...... .. + ... tt.... J .... + .. .. .. .. .. _.tI" .. "f-
++++++ +++++++++++
++ ++++.++++++ ++ +++++++++++
.. ++++++++++++ ........................ + J __
.. +++++++++++! .. +++++++++++,
• • •
Waves Stonn Surge Future expandability &
in 4.0
'" til ;;t 0.0 f
/
Wlde,Flat Earth Dike
z 0
-4.0
" ·8.0
Breakwaters Density ground for ··-- oelamlc otabUIty
o 10 20 130 140 150 160 170
LEGEND:
CURRENT DIKE ALIGNMENT
PRIMARY ALIGNMENT 1 • LULU ISLAND ALIGNMENTS
PRIMARY ALIGNMENT 2 - STEVESTON ISLAND
REACH BOUNDARIES
FEDERAUPROVINCIAL OWNED LAND
CITY OVVNED LAND
---------I + + + + +1 * * * t t
Flood Protection
Improvement Alternatives
Reach 8: West Dike
Option C
EB3763 July 2012
180
CNCL - 393
CONSTRUCT A
FLOODGATE
Attachment 3
CONSTRUCT A
FORMAL DIKE
!if 4.0
;:: 6 0.0
i 4 .0
_ .a.0
Future Dellgn Storm Surge &Wav • •
o "
FloodGate Structure and Pump Station
within Dike
Full wndard Earth Dlk.
Clos. prior Improve and ral •• with
CONSTRUCT A
FLOODGATE
to Storm ra-development .urge and rl ____ ---'-1 ____ ---,
Current Design
Surge & Waves
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-Denlity founcUtJon
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City of Richmond Dike Master Plan
Primary Alignment 2 - Steveston Island
EB3763 June 2012
CNCL - 394
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City of Richmond Dike Master Plan
Steveston Community Fishing Harbour Longterm
Development Concept with Integrated Flood Protection
EB3763 June 2012 I CNCL - 395