Dike Master Plan - Phase 1 - City of Richmond

To: 

From: 

City of 

Richmond 

Public Works and Transportation Committee 

John Irving, P.Eng . MPA 

Director, Engineering 

Re: Dike Master Plan - Phase 1 

Report to Committee 

:l'2 ¥1&'T -JiJ,lq IB:.?G12- 

Date: June 27, 2012 

File: 

10-6060-01/2012-Vol 

01 

Staff Recommendation 

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 

REPORT CONCURRENCE 

ROUTED To: 

Real Estate Services 

Sustainability 

Roads and Construction 

Sewerage and Drainage 

Parks 

Development Applications 

Policy Planning 

Transportation 

CONCURRENCE 

/ 

~ 

~ 

~ 

:: 

CONCURRENCE OF GENERAL MANAGER 

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REVIEWED BY SMT 

SUBCOMMITTEE 

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INITIALS; 

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CNCL - 371

June 27, 2012 - 2 - 

Origin 

Staff Report 

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 construction, 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 creative 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: Rai se dikes in their current alignment or a close parallel ali gnment on 

Lulu Island 

Raising dikes in their current location presents a number of challenges that include limited space, 

utility conflict, development conflict and construction scheduling. Leaving dikes in their existing 

ali gnment 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 ali gnment as well as some proposed alternative ali gnment options arc 

shown. 

Attachment 2 presents a series of dike ali gnment options w ithin each reach boundary. Options 

vary with location and seismic design considerations. 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 City'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 similar 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 full enclosure on dredging needs has not yet been anaJysed. Similarly, the 

ecological impacts on existing wetlands located within and east o f the harbour and authorization 

from Federal Agencies in relation to ecological, First Nations, and/or fisheries values have not 

yet been evaluated. 

Primary Ali gnment 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 peri ods 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 compatibility 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. Elements of each could be used 

over time to provide a co mplete fl ood protection package. 

Table 1. T he pros and cons of Primary Alignment 1 versus Primary Alignment 2 

Primary Alie:nment I Lulu Island Primary Ali rnment 2 Sieves ion Island 

Topic Pros I Cons Pros I Cons 

Cost 

Neutra l - initial cost estimates are similar for both options 

Property and City owns land and Existing structures Steveston Island is Government 

Land Usc right of ways for must be vacant of jurisdiction issues 

some options accommodated development with land use 

Construction Can build in pieces High community Low community Must be built as one 

and use temporary disruption disnlption project to be effective 

infrastructure for 

effective flood 

protectio n 

Adaptabilit)' to Will disturb the Relatively easy to 

FutUre Raising community if raised raise in the future 

in the future 

Environmental 

Needs further assessment 

Geotechnical Ground Minimises ground 

Implications improvement may improvement 

impact existing impacts to existing 

build ings and buildings and 

in frastructure infrastructure 

Commu nity High impact on Minimises 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 resembles The replacement Maintenance 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 local procedures with 

infrastructure for Maintenance may community additional short and 

relatively simple impact the local long tenn costs 

O&M 

community 

Roadway Disruption 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 19 th Century. Tidal drift, river dredging and river training 

structures all impact sedimentation in the Fraser Ri ver 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 hi gh 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) 

/(5pt 

Andy Bell, P.Eng., M.Eng. 

Project Engineer, Engineering Planning 

(604-247-4656) 

LB: lb 

CNCL - 376

1 

Attachment I 

I 

I 

I . 

d 

I I 

E 

§ 

\ 

; f 8 

~ 

CNCL - 377 

0 

§ 

0

Attachment 2 

Future Design 

Stonn Surge & 

Waves 

'" 

~ 

•. 0 

I" 

~ 4.0 

~ 

z 

~ 0.0 

'" 

~ 

-2.0 

LEGEND 

Current Design 

Stonn Surge & 

Waves 

, , 

0 10 

CURRENT DIKE ALIGNMENT 

PR IMARY ALIGNMENT 1 • LULU ISLAND ALIGNME NTS 

PRIMARY ALI GNMENT 2 · STEVESTON ISLAND 

REACH BOUNDARIES 

FEDERAUPROVINCIAL OWNED LAND 

CITY OWNED LAND 

, 

20 30 

---- 

I + + + + +1 

EB3763 July 201 2 

CNCL - 378 

Future 

expandabillty 

I 

earth Dike 

~ Denstry ground for 

.elsmlc stabtlfty 

40 50 

Flood Protection 

Improvement Alternatives 

Reach 1: London/Princess 

Option A

Current Oeslgn 

Storm Surge & 

8.0 Waves 

Future 

expandability 

a 0.0 

;;; 

~ -2.0 

LEGEND: 

, 


.Iope facti for •• Ianle ."blilly. WllYe 

dissipation & to raise riparian wetland. In 

paee with sea level rise 

" '" 

PRIMARY ALIGNMENT 1 - LULU ISLAND ALIGNMENTS 

PRIMARY ALIGNMENT 2 - STEVESTON ISLAND 


FEDERAUPROVINCIAL OVv'NED LAND 

CITY OVv'NED LAND 

30 

---- 

I + + + + +1 

t t t + + 

'" 



Reach 1: London/Princess 

Option B 

EB3763 July 2012 

CNCL - 379

8.0 

~ 4.0 

~ 0.0 

"' 

g -40 

~ 

al -8.0 

Future Design 

Storm Surge & 

Waves 

Current Oaslgn 

Storm Surge & 

waves 

Sheet Pile / 

/ / 

Future 

expandability 

~~~~a----~----~--" ~" "'~" ~~ __ ' 

++-__ Dent.tfy ground for .... mlc 

stability 

~ 

Ll 1 

.Je , - 

~ 

I'-~- 

L~~---y 

'-----~ 

OL---L--"'~0 --"---~20C--L~~3~O~"---~40C--L--~50=--"L--"60O--"---=70C--L--~80 

II i 

__ 

LEGEND: 







---- 

----- 

I + + + + +1 

+ t t t t 



Reach 2: Paramount 

Option A 

EB3763 July 2012 

CNCL - 380

Current Future Design 

De&lgn Stonn Stonn Surge & 

I:: u-:~,.~,:,·:·:-:,:··:· :··:·-:-:··:·:(~. ~Fut " "~U~ 

'd.. 

'_b_lli_t'J_l 

il 0"0 "------, 

" 0 

~ .," 

.... -8.0 

___ Density ground for 

seismic stability 

o L---L--~'-0--~--~ro---L--~3~0~~~~40~-"---50~--L--"60C--"---"70c--L--~80 

" 

LEGEND: 


PRIMARY ALIGNMENT 1 • LULU ISLAND ALIGNMENTS 





---- 

------- 

I + + + + +1 

+ * * t t 




Option B 

EB3763 July 2012 

CNCL - 381

8.0 


Stonn Surge & 

Waves 

Future Design 

Stonn Surge & 

aves Future Standard 

expandabllIty Setback Earth 

I 

! Dike r 

l(.. 

r _________ nh 

./' 

__ 

- 

-4.0 

·8.0 ~~~-~~-~---I ~~~-~~-~~-~~-~-c-:- 

o 10 20 L,--J 

Existing Setback 

Dike In Port land 

100 110 ,20 130 140 

I 

New Dike ROW 

LEGEND: 


PR IMARY ALIGNMENT 1 • LULU ISLAND ALIGNMENTS 





---- 

----- 




Option C 

EB3763 July 2012 

CNCL - 382

• 

),0000 ! 

Cu"ent Design 

Future Design 

Stonn Surge & 

~ 

Future expandabilily 

Storm Surge & 

:l 

Waves 

Waves 

_ 80 \ 

~ 4.0 

10 

~ 0.0 

z 

0 -4.0 

~ 

~ -8 .0 

w 

LEGEND: 

0 10 30 

I 







CITY OV\ft"lED LAND 

Ie< 

1 i' 

r ['---'I 

[ 

I 

100 11 0 120 130 140 

+ ± + + * 

I 

---- 

----- 

t + + + + +1 

EB3763 July 2012 

CNCL - 383 

J 

.. .. .. 

II J - " 




Option D

Future Design 

Stonn Surge & 

Waves 

Raise or 

Floodproof 

Structures 

Cumtnt Design Outside of Dike 

Storm Surge & \ 

Wave. 

Raise Of' 

Floodproof 

Structures 

Outside of Dike 

Earth Fill Dike 

Wide, Flat and 

Setback 

For Stability 

Future 

expandabllity 

. " 

" 

" 

&0 >0 

'" 

I 

Existing Dike ROW 

LEGEND: 






CITY OVVNED LAND 

---- 

----- 



Reach 3: Britannia 

Option A 

EB3763 July 2012 

CNCL - 384

RAISE BUILDINGS 

o 

\:4000 ! " 

,,~ 

! 

Current 

D.slgn Storm 

Surge & 

Wavelli 

Rals. or Floodproof 

Future Design Structures Outside of 

Storm Surge & Dike 

Waves 

"oe' 

Pile 

Future 

expand.bUlty 

LEGEND: 






CITY OVJNED LAND 

---- 

----- 



Reach 3: Britannia 

Option B 

EB3763 July 2012 

CNCL - 385

• ...... ...... 

...... ---.. ...... ~t;::~ 

Future Design Current 

Storm Surge Design 

& Waves Storm 

Surge & 

Wave. 

8.0 

i 4 .0 

_ 0,0 

Earth Fill with 

densificatlon 

! 

Future 

expandabUlty 

....... .1 . '. 

~ ·'.0 

~ -8.0 

o 

10 

20 '0 50 

I 


70 80 9Q 

LEGEND: 


PRIMARY ALIGNMENT 1 - LULU ISLAND ALIGNMENTS - - - - 


REACH BOUNDARIES - - - - - 

FEDERAUPRQVINCIAL OWNED LAND 


I + + + + +1 

t + * * t 



Reach 4: Be Packers 

EB3763 July 2012 

CNCL - 386

iii 

.. 4.0 

~ 

A •• 

5 

• 

o 

Future Deslg" 

Stonn Surge & 

W ...... 

Cumnl De.llln 

Stonn Surge & 

Wav •• 

Signifi.::.n! 

wawolln 

Harbour 

Railing. waterproofing, and/or 

ero.lon protection by property 

owne .... .t their rhlk 

Future 

elqMnilon 

, III 

LEGEND: 

CURRENT DIKE AliGNMENT 





CITY OVIfNED LAND 

---- 

t ... ... ... ... "'I * t + t + 



Reach 5: Steveston Village 

Option A 

EB3763 July 2012 

CNCL - 387

' :4000 ~. t. iiii..l"~""5iiiii;;;"~ ! 

1 i:: 

, 

~ 

••• 

~ 

. -LO 

oJ _a. Q 

FutUAI OHlg" 

Storm Surge 

" W.V1tS 

No Impl'Cl'Mme""to ,~_~ 

1.land (Albion dike. Of S. Jetty) 

• 

I 

'" 

SlgnlfiCllnl 

w.v •• ln 

Harbour 

I 

..... 

N .. Dlk,ROW 

Deonslfled fill " 

....;:hOl'1l 

'" 

--- 

-- 

Dike backed by ... 

'" 

aM, 

tlglll. seismically 

atllblllzed foundatlonl 

with r.dtIwlopmant 

LEGEND: 


---- 


PRIMARY ALIGNMENT 2 - STEVESTON ISLAND ______ 




t + + + + +1 

± * + + + 



Reach 5: Steveston Village 

Option B 

EB3763 July 2012 

CNCL - 388


Future Design StormSurge& 

~t:;~s :~or\ ..• 

jW,.'.'." .._ 

F 

uture 

.......... , expandabUlly 

u> 4.0 

100 r-j[.-. ......__ , --...-. 

z 

i 4 0 

W -6.0 

~""";..:::.. Shoo< Pile 

1:4000 

1 1 

~, ~ 

Il'; F: " In-"' 

11 J " I " 

- .. - 

~~~~~~j~~~~~~~~~~----- 

o w 

180 , 200 220 1 

'60 

I 

I 

''''' 


Existing Dike ROW 

I 

LEGEND: 


PRIMARY ALIGNMENT 1 - LULU ISLAND ALIGNMENTS - - - - 


REACH BOUNDARIES - - - -- 





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 

Future Design 

Storm Surge & 

Waves 

Setback Dike Leaves 

Park Space Vulnerabkt 

10 Occasional 

Inundation in the Long 

T.~ 

Earth Fill Dike 

Wide Flat and 

Setback 

Future 

~l~'~~i'~OO'blll~ 

r---'" 

... '" 

, 

10 

JO 

50 60 

80 60 

LEGEND: 


PRIMARY ALIGNMENT 1 - LULU ISLAND ALIGNMENTS - - - _ 


REACH BOUNDARIES - - - - - 



I + '" '" '" "'I 

± * * t t 

I 

EB3763 July 2012 

CNCL - 390 



Reach 7: Garry Point

+ + 

+ • • 

.. .. .. + 

t .. .. .. 

ftt.+ ••• 

fttttttt 

+tt .. ,. .. + 

.++i-+++t • 

" •• ++t .... 

+++++t++ 

ft+tft ... 

.. .. .. .. .. .. .. + 

t .. .. .. .. .. .. + 

t .. .. .. .. .. .. + 

t .. .. .. .. .. .. .. 

.. .. .. .. .. .. .. + 

tt+t.+++ 

.. .. .. .. .. .. .. .. 

.. 

• 

.. 

• 

.. 

• 

+ 

• • • 

• • • 

• • • 

• 

.. .. .. + 

t .. .. .. + 

.. .. .. ... t .. .. +- + 

tt+.t. 

t .... .......... + 

tt fttt+. 

• 

• 

.. .. .. .. .. .. .. .. t 

tt ++++++++ 

• 

• 

.. .... .............. + • .. + 

tt +t++ ....... + 

to. ++++++++++ 

++ ft ......... ++. 

++ •• +t++.+.+. 

.... • t ... tt.+++. 

..... + .. +t+ ...... 

+ +t++++".++t .. 

++ +++++++++++ 

.. ftft.+ ... ++. 

++ .ft+t+.+ ++ 

• • • 

Future Design 

Storm Surge & 

Waves 

Current 

Design Storm 

Surge & 

Waves 

Toe Berm for 

Wave 

Dissipation 

Future 

expandablllty 

8.0 

4.0 

0.0 

-4.0 

-8.0 

/Wlde, Flat 

- / _ Earth Dike 

----- 

• o.ntllIy ground for 

--- seismic stability 

o 10 20 30 40 50 60 70 60 

LEGEND: 







---- 

I + + + + +1 

t ± * * t 



Reach 8: West Dike 

Option A 

EB3763 July 2012 

CNCL - 391

.-+- ~ . 

~ 

.. .. ........ .. .. .. 

+ + 

• ++++++ 

.. .. .. .. .. .. .. 

+ 

+ 

+ 

+ 

+ 

+ + 

+ + 

+ • 

+ ' 

• 

• ++++++ • 

• • 

+ 

+ • 

+ • 

.. .. .. oj- .. 

• 

• • 

• + + + 

+ + 

• • • • 

• • 

+ • 

+ + • 

+ • 

• • + • • + 

.. .. .. .. .. • 

• 

• 

+ 

+ +++++++ • • + 

• • 

+ 

.. .. .. .. .. .. .. .. • 

+++++++ • • 

• 

+ 

.. .. .. .. .. .. .. . • • 

.. .. .. .. .. .. .. .. • 

+ 

++++++++ • + 

+++++ ++ .. 

_--J-'--'- ••• • J..~ .~I 

• 

+ + + 

+++++ ++ 

++++++++ 

.. .. .. .. .. .. .. .. .. .. 

++ ++++++++ 

.. .. ~ ... 

.. .. .. .. .. .. .. .. .. .. .. 

... .. ... .. .. .. .. 

.. .. .. .. .. .. .. .. .. .. .. 

++++++++++++ 

++++++++++++ 

++++++++++ + 

.+ •• + •• + ••• 

• ....... + ...... 

++++++++++ 

+++++++++++ 

++++++++'t+ 

• 

• 

.............. ... .. t- .................. " .... +~.L~-+~I1-"": 

+++++++++ 

LEGEND: 

8.0 

_ 4.0 

I 

0.0 

~ -4.0 

;, 

~ ".0 


a 

Future 

Design Stonn 

Surge & 

Waves 

Natural or Enhanced 

Sedimentation & Rise In 

Sturgeon Banks Coinciding 

with SLR 

Stonn Surge & 

Waves 


PRIMARY ALIGNMENT 2 • STEVESTON ISLAND 




Toe Berm 

for Wave 

Dissipation 

_ / 

Future 

expandability 

/W1de,Flat 

Earth Dike 

--- 

10 20 30 40 50 60 

---- 

I + + + + +1 

1* * * * * 

EB3763 July 2012 

CNCL - 392 

Raise where 

compatible with 

redevelopment 

70 80 




Option B

+++++++ 

.. '!:...-t ... .. • 

~ + .... + 

............ ",".IIi,.,- .. + 

++++ ... +++ 

.. + 

.. .. .. .. .. .. .. + 

.. .. .. .. .. .. .. 

.. .. .. .. .. .. .. + 

.. . 

.. .. .. .. .. 

++++++++ 

+++++ ..... 

-"-'---"--.. ... ... Jt 

• • 

+++++++++ 

I··· ++++++++++++++ 

.. ····· .. 

1+ .......................... + 

.. .. f .. .. .. .. .. .. .. .. .. .. .. + 

+++++++++++++++ 

.. .. ~.. ........ ~ .. .. .. .. + 

.. .. .. .. .. .. .. .. .. .. .. .. + 

.. .. .. .. .._.tI" .. ...tt.... J .... + 

"f 

++++++ 

+++++++++++ 

++ ++++.++++++ 

++ +++++++++++ 

.. ++++++++++++ 

~~:"; ~;~,,,; .. ...... .. + 

+++ ~ ++ 

•·:'If 

........................ + J __ -l---i f--J~ 

.. +++++++++++! 

.. +++++++++++, 

• • • 

BARRIER ISLANDS, 

BREAKWATER 

Future Design Current 

Storm Surge & Design 

Waves Stonn Surge Future 

& 

expandability 

8,0 

in 4.0 

'" 

til 

;;t 0.0 

z 

0 

-4.0 

" 

~ 

~ 

~ 

~ 

·8.0 

f 

/ 

Wlde,Flat 

Earth Dike 

~~~:i -- -~~~---, 

Breakwaters 

Density ground for 

··-- oelamlc otabUIty 

o 10 20 130 140 150 160 170 

180 

LEGEND: 






CITY OVVNED LAND 

---- 

----- 

I + + + + +1 

* * * t t 




Option C 

EB3763 July 2012 

CNCL - 393

Attachment 3 

CONSTRUCT A 

FLOODGATE 

CONSTRUCT A 

FORMAL DIKE 

CONSTRUCT A 

FLOODGATE 

!if 4.0 

;:: 

i 

6 0.0 

4 .0 

_ .a.0 

Future Dellgn 

Storm Surge 

&Wav • • 

o " 

Current 

Design 

S1o~ 

Surge & 

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Dike Master Plan - Phase 1 - City of Richmond

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