facing up to rising sea levels document final
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8/4/2019 Facing Up to Rising Sea Levels Document Final
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1
Facing
up toRisingsea-LeveLs:RetReat? DeFenD? attacK?
The FuTure oF our CoasTaland esTuarine CiTies
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T pbct jt pjct btw Bg
Ft t ittt Cv eg.
Tgt w w pc t ct t
ct pctc ct mgmt
t b ctt tkg bt t
t. Bg Ft b tc c
2000. it t r ittt Bt actct
tk tk, cg wt kg w t pp
t p t w wk wt t
pptt t cg tt w w
c. T ittt Cv eg (iCe)
gb mmbp gt tt pmt
vc cv gg t w.
T tk pc g t pvk g-tm
tkg c w c: m gvmt, t
pc-mk, t p, t ctct g
t t g pbc. o pp tm;
t t b t tck t c t
pbm. dg t cpg p t pjct t w
tf tt, w t pbm t b
c t tt t uK ct, ww c t pjct ct. C t b
ctt w w f t mt ct pbm:
t vt c mg m pp
m ctc tct tm t
p tm. Ftm, t cqc w
b g-tg. T pbm cg p
b t ppt gwt, b mgt ptt
g m w pmt ct,
ggtg t pbm.
Fcng up to rng s-lv cmp t
w pgmm c g c t
b t riBa t iCe. i 2007, Bg Ft
pblvng wt Wt: Von of Foo
Ft, wc c t Tm Gtw
ttg t cp wt c g. T riBa
Pc t ct pb dgnng fo Foo
rk, t 7t riBa Cmt Cg Tkt. T g-
cmt gv g tg
t m tt -k gv t, w
b vvw ct pc, gt. it
g ttg tgt ppc
t t ct mtgt k. lt
t iCe pc Foong: engnng rnc,
cmt mkg cmmt t ct
c gvmt w t mpv t tct
tg t t mgmt pt t
k. Bt t iCe riBa v ct
cgz t c bt vmtp t cg b k m
t-ttt gp cmpg iCe, riBa,
r Tw Pg ittt, r ittt
Ct sv, Ct ittt Wt
evmt Mgmt, lcp ittt
t r ut svc ittt.
Fcng up to rng s-lv ccmp b
tg bt m t g w t
b c cgg tt c t
t tt fct c w v t b
m t t b ptv . F m
mt t bt, p vt:
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cg-p
diCKon roBinson
C Bg Ft
Ben haMer
C iCe Pjct stg GpstegtWt:aptfmCrsisFt.t
FoReWoRD
T gt t uK ct
12,429 km 7723 m, cmp t
t ct it (7,600km), sp
(4,964km), Fc (3,427km) T
nt (451km). 1
i J 1953, v 300 pp
v 24,000 m
w t t ct
eg t c w
bc cqc
tm g w t t
g v. 6
i eg t ct cm
m g J J
2007 c 3.5b. 5
a cg tm
qt ctt,
c-pt t
btw t pbc gc. 8
a c
pg mt b c
t mmm 750M
(ct c. 500M) jt t
mt g-pcct
v ptct. 3
hm c fm t t
4 b b 2035
pg wt mg. 2
a 10 m pp, 5.5 m
ppt, v k
eg W, wt 2.6m t
ppt t ct k g m
v t . 4
i h, t 100mm
24 t smm 2007, 600
tt, 9000 m 91
t ct 99 c w . 1300
b w ct. 7
uK: 2M sea-leVel rise
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changingenviRonmentsea-LeveL Rises
s-v nmtkbyg. a t c
wm, t p. T b t pm
ctbt t t tc -v wc
ct cct m 1.7mm p
v t 20t ct t 3mm c t 1990. 9
at ctbt -b c mtg. T
mc t pct, bt t ct atctc
G ic-st mt w b cttpc
c mc t -v. T
ct pb ut Kgm Cmt
Pjct 09 (uKCP09) ct g p t
76cm b 2095, bt wt v tm fg
vbt ttg 190cm. 10
a -v , t mt wv g
tt c t c mc tt
wv vtppg mgg wv mpct
bc tct b g ct.
LanDmass sinKs
T m t st t uK kg
tv t t nt. sc t t gc p
t ut Kgm pcg ottc
bon. T w v c-t p
m v ct, t m tt t
b pw t c c. i t uK t
pw b t tkg pc sct t v nt eg, cg t m
t t t k.
stoRm FReQuencY anD intensitY
stm qc tt pct t
c v t 21t ct. stm g c
t m -v b gfct mt. i t
pp g pc g t, t ct
mtc wt v t gt tm. F
mp, g t 1953 , st w
2.9m g. Wt 100 t p, g
g k t v k t cc.
sea-LeveL Rise, LanDmass sinK anD
incReaseD stoRm FReQuencY mean
coastaL FLooDing is set to occuR
moRe FReQuentLY anD With gReateR
seveRitY, incReasing the Rate oF
coastaL eRosion. ouR coastaL cities
anD toWns neeD to be pRepaReD FoR
this FutuRe bY taKing action.
intRoDuction
lead loCal
Flood auThoriTy
naTional
PlanninG
PoliCy PPs25:
deVeloPMenT
and Flood
risK
hisToriC
BuildinGs and
MonuMenTs
CoMMission
loCal PlanninG
auThoriTy
disTriCT
CounCildeFra
reGional
Flood deFenCe
CoMMiTTee
naTional
PlanninG PoliCy
PPG20: CoasTal
PlanninG
BriTish
WaTerWays
inTernal
drainaGe Board
enVironMenT
aGenCy:
sTraTeGiC
oVerVieW
PorT
auThoriTy
naTural
enGland
deParTMenT
For
CoMMuniTies
and loCal
GoVernMenT
land oWners
ProPosed
deVeloPMenT
in Flood
risK area
MinisTry oF
deFenCe
oFFiCe oF
CoMMuniCaTions
hiGhWay
auThoriTy
BuilT
enVironMenT
CroWn esTaTeCenTral
GoVernMenT
oFFiCe oF rail
reGulaTors
reserVoir
ManaGers
insuranCe
seCTor
PriVaTe land &
hoMe oWners
Gas and
eleCTriCiTy
MarKeTs
auThoriTy
naViGaTion
auThoriTydeVeloPers
PuBliC land
oWners
The PuBliC
WaTer serViCes
reGulaTion
auThoriTy
MarTiTiMe &
CoasTGuard
aGenCy
harBour
auThoriTy
MeT oFFiCe
arChiTeCTs/
enGineers/
desiGners
WaTer
CoMPaniesis,
dmuvty2009
landMass sinKs
sTorMs inCrease
so, Whats the pRobLem...?
T t t uK ct t ct ct
b tw tg: t cgg pc vmt m-
m ctt. T cgg vmt ct
g -v, kg m c tm
qc. T g-tm t q gt ptt.
Wt w c tck wt mmt ct t m-
m ctt t g-tm tb mgmt
t ct. T ctt c mt fc
c, c cmmct btw m
tk pg t pppt tmc.
man-maDeconstRaintsLimiteD ResouRces
T mt pg ttbt
pbm laCK oF FundinG. T uK
t v fct t t
t ct. T pc wtwg
mtc pc tt:
cmmt bg m tt w
pc c -ctv-tvt,
ctv mmt wt 20 .
T ProPerTy insuranCe
mkt v gfct mt c
t tt. Ppt t
mkt v t c g b .
ut 2013 t w pv cv t
ppt wt t 1.3% cc
g p , wc qvt t 1 75
. 11 T m cg g k
w c c pmm t
cv. T c ct ctv
t btt m mk tm m -tt wg cm; wv, ctm
t w gt, t c b tg
fc gmt mpvg t
c m.
communication
T g mb sTaKeholders vv
t wt g t
pbm cmmct. T c tc
w cmpct t c mkg
pc, g t ct p.
T gm ppt bg t w t
cmpct vv.
T mc cc t
PuBliC MindseT bt vpmt t
p. o t t , vg c
pmt t wt b m. T
pp t b ck tg
risK, wt b c
ccptb k. F tc, t pbc
t wt 1 200 ,
wt t z m?
timescaLe
i t TiMesCales tt ct tk
wk t, t mtc c.
Ct Gp w p 100 s
Mgmt P (sMP), w c
pg 15-20 z.T ptc tm c ck
ctc ptc p.
sttg t cc t tmc
fct cg, bt ct p t
ttc t z, w t sMP t
mt t g-gt vvw.
manY oF ouR most impoRtant cities
anD toWns aRe situateD in aReas
oF tiDaL FLooD RisK on the coast oR
on estuaRies. histoRicaLLY these
cities have gRoWn on the economic
stRength oF the poRts anD theiR
associateD tRaDes. moRe RecentLY
touRism has been a signiFicant
economic DRiveR. WhetheR it is FoR
theiR touRism oR theiR poRts anD
tRaDe, these cities aRe paRt oF the
nations FabRic.
stegtWt
Who TalKs To Who?
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We need To Turn anegative ProBleM inTosoMeThinG positive!
T w wc t c b cv. W c c
t t ct ct vb t -v .
o ct cmmt ctbt t cm,
pt t, m t m t;
uK d r r t mgg cgg vmt ct.
tr r d w. i t g t k cqc , cg
z t-wg , ptt m ,
t pc m m, g pcgc
mg, ctc ct btt, bmt
ct, b p mg b c cmc cp.
tk l-r w f fr f y dd rdly ll ll lklyq f -ll r.
T nt s tm g 1953 t gv m
t cqc t g t uK. T t
t w tmt t v 300. tdy r l r dly ld d l fdr drlly rd. T vttgct hc Kt t ct nw o
2005 t ct 2007 g t uK b
t pmpt t ct.
the missing visionWhat neeDschanging?LimiteD ResouRces
W t tk ctv bt meConoMiCally susTainaBle tt k mgmt. dvp w tk -mgmt t cmmc g. Bt t pvt ctg w b t f t gp Gvmt g t cfct. C mgmt bpftb? W gvmt g tt c, b ct ,t t t g t tck t pbm. T ttv b tkt t p mt-bjctv pjct tt cb mt-.
T arChiTeCTs andenGineers b t mbc k wt g. ivt ctvt ttg t mg
gwg b ctct gg g wk tg t k. T cg t g tct t f ptv t t pt,t mtgt t k, gv t t vpmt.
communication
W Joined-uP, CoordinaTedThinKinG aCTion b ttt ct pt. T gmb tk vv wtg mk t cmpct pc,bt t p tt t w F Wt Mgmt B w tbmc c pbt. T g ct, ttgc b t evmt agc bc t tk; wv, t m gt c.
T t b mcbtt CoMMuniTy enGaGeMenT t pc. T cmmt t t t ct k t c, w t ctv t ct w v g tm v. T pbc t t t g-tm t t ct cg. T b ct wt gt g t
c-mkg pc t ctt t.
timescaLe
T t b lonG-TerMsTraTeGiC Vision mb tct pg, pc -ct. T 100 sMgmt P (sMP) t t t ct tw ct, wtt tmtc mg tt -t- pc cct. at tm tm, c pg ct ct t b t 15-25 z bg t pc ptgt b vmt t c t gt. Bt c pg tmc sMP w q tg p mt Gvmt bt t tktg c. T c pgtvt w t b g t pbm.
stoRies FRom home
manageD coastaL ReaLignment
i tb pgpc ttg, cfc t t w
vp t t m ct m t. T vt t
pbm ct wt ct qz t w.
M ptc v g c w wt
t ctv t bbg t wv g,
t c t v pw t . T
cct t-b mt t c pt -
mtg c tt (wt mt) c kp pc wt
g -v. T m vv ccg tbzg mt
mbz b w.
T btt t ct g bvt
cvt v, t t g gm
ctm vc bt mgtg b. i vt w
g bg, b t eu hbtt dctv, t pc
t m mt t t vpmt.
Pofo a J dvy, unvty of et ang
evmtagcy
nam
nam
BCt
utsttCtG
innovative sea DeFences
T iCe Mt aw mt
cm Cv mp
bt pctc. T c cm
bft t cmmt t
b g ptct m t
g, bt b cg t
mt t t bc. it k
t ct c tt t
t t t cmmt m t
pmt t t .
RecYcLeD maRine
inFRastRuctuRe
dg tt pv w t
riBa stb lvg b dg
t C actct stt
aw w t pp
ctg tg ct t Tm
Gtw g cmm
p ptm. T l
g w gt bt
pg, w tckg t
t g .
atyl
aDaptive aRchitectuRes;Raising Living anD ResiLiance
T T h b n am : 1. a ptb tt p t , wtt cmpmg vg
g t t t . 2. a tt mt t ccpt t tm. 3. a wg tt ct pc
k t t cmmt t ppt twk.
F mt t , t - ct tpc t tm t w
ttv t vg gmt t b pt. W wg , ccpt ct t tft w t wt pt w t ptt t g . a bt cct tg m
t t w cg t t b. dkg wt cc p ft v
tg w c b t t cc mgc pp ct t ct pvc c. T tmb
tt t t ft w k wbg t bcm t w t tc, t k wt gbg
bc ct cc pt jg t t t cmmt.
7
WesT silVerToWn,1953 neW orleans,20 05
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FLoating / amphibious homes
d Vm g t tg cmmt Mbmm, nt.
T bt cct tg b. at w wt v t
t cct t. T v w-m ctct
t kp tm gt pb. T c t b mg
pt tt c t w t wt. it pct tt c v fv
t wt w t c v (m t 70 ctmt) tt t
w t t g. T c ccmmt c
wt v p t 5.5 mt.
stoRies FRom abRoaD
saint peteRsbuRg FLooD pRevention FaciLitY compLex
a 25.4km b w ptct t ct m vt p t 1 1000
wt g 4.55m. T pjct cq m mtc g
m t ep Bk rctct dvpmt, w t
bk cm m t r F Bgt. it bv t tt
w b v b t ct m g mg w cmpt t 1.8b p. T m b mtw, mg pt
t st Ptbg rg.
LanD RecLamation
l cmt b pctc
t w ct. T uK
g tg t cmg
gct. T nt,
hg Kg,Tk,nw yk sFcc mgt t pc v
pctc cmt t ct m
vpb pc. M ct,db
pctc tv cmt
wt fm tt g. V o
v tk t wk db.
integRateD Design
soLutions
nw g bg ct
b tv k ct
pgmm t nt
pt t rm t
rv pgmm.
itgt g pp
tt tt w
p t le ppc (vp
wt d g).
T pp cmb
wt (g) wt v
cg, t vpmt
tb tct
t ct g wt
-fct c-
tt. it w b wc
tt ctct
tcc vt.
Bc actct t
t t le pjct v
tk t wk njmg.
2009Ggimgy
MVrdV
hcw
Vo
MVrdV
atJnv
atJnv
dVm
sc:rettC.cm
dVm
buiLDing out
into the WateR
sm pjct ct w,
k t lv ab db
g b J nv, b
ct t wt w c wt.
ackwgg t v pmt
t wt bg, t cm c
jt t t ct bg
t w c.
98
atJnv
buiLDing on stiLts
dtc actct, MVrdV, g
t g tpg t lw
nt W nw o. Wkg
wt Mk it rgt, g bg
g cpt k
t b tct t t 2005
. T tt g w t
pc bw t b c
pkg, w t t
ppt m g.
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reTreaT?T tt t tp bck m t pbm v ptt cttpc bw.it t mv ctc tct g t g t wt wt t t ct t vt k. T ctc t mbnonmnt, w pp g-tmp mngpc.
Mg rtt, Mgrgmt mt mvg bcg ct c, wgt wt t pvptct. T c tct w. a vtg t t c t k t vbt t g t ctb mtg t t wv g.hwv, t m v ct w- ct t t c cm c g-tm tbt. Mc t-t btt ct,c t-m m-t.
i ttg, vtmt tgtct tct t
t cm cm b t. nw vtmt mt b m ctg cmmt tctt m w. hwv, m vb gfct c vtmt c.
T t, v pt t mg gmt v b ct t mtg pc wgpmg t. hwv, tt w pv m mbtt. hoW do We reTreaT FroMa PoPulaTed area, and one WiThinFrasTruCTure CriTiCal To ThenaTion? i t pb pctc ttt m c ?
RetReat bRieFing
scenaRio: the next 100 YeaRs
a -v v , vb m b c. Cp wt t, tmqc tt v c.W v c ctc pt wb g c t
tb fc vb t.it bcm mpb ppt tk t b wtt. T pt t rtt. rtt t ctt tmv t c w ct m.
appRoach: a FeW points
to consiDeR
How can this process be managed in act w?
Which sites in the city need to bett m wt tmc?
Does the city choose densication ontg t wt t ct tt v w k?
What happens to the rural land at themg t ct?
Does the city start an entire relocationpgmm?
What happens to the land left behind?rct b gct?
If we can accept living with water andccpt t ctt, wt t-ftctct tct wkp t ct ctg?
Are there architectures that could retreat
wt t g t c c? Above all, any schemes should not
cpt t w kvt, bt ttmpt t w t k g t w.
DeFenD bRieFing
scenaRio: the next 100 YeaRs
T g gwgg fct c; bgt mtc t mtc vg mg ct tt bt vmt. Bt mtc
t pct: mpvmt t b m -v ctt m ct t k.Gvmt g g b tcv t cv, bt t bft c twg t ct. T pvtct k t cpt t vcg t t vpmt cm.
appRoach: a FeW points
to consiDeR
How can defence systems becomecmmc vb?
Will they be mixed-use? Residential orcmmc?
Will the structures be permanentlybtb?
Will the defences make provision forc mt tt t bm b c t?
What will be happen at the fringes of thect?
With any defensive policy there is alwayst k bc. T, wtctct tct wb tb b t c,tcptg t k?
Above all, any schemes should not cpt t w k
vt, bt ttmpt t w t k g t w.
attacK bRieFing
scenaRio: the next 100 YeaRs
T ppt t t uK c wt t t p t p-w. ic pbc tg
t k vg wt wt t t ccmmt wt tb v
mt tt t c wg tpmt wt vg gmt tct. Tkg pt m vpctc bg t t t wt,cmb wt w tcg, bt tpbc pvt ct cft vt bg t t c.
appRoach: a FeW points
to consiDeR
How could we make space for futurevpmt t t tg c, g -v ?
How viable is land reclamation andp?
How would communities be encouragedt tt t t pt?
What would be the commercialpptt t w t?
How might they be sustainable? What further function, beyond creating
vpmt pptt, c tpp cm v?
Could they reduce ood risk to thetg ct?
How will the city adapt if no furtherc bg pv?
Could they moderate coastal erosion g- t?
How could oating or amphibiousctct b cpt tt cm?
deFend?T t t wt t t t tg bt vmt.T w q bt c t t t ptct w b mt t tt t -v .atg t ct pv pct pt, c t c tmvb g w t mk tmcmc cmmc vb?
M t gc t 20t ct v bctc bg tb, cgcc t wt, mgg t ctbtt ct t mt mpv.hwv, t v pv ptct c k m g, wgctvt t g tpt tbt vmt. Bt wt t ctmv v ct? Ftc, c t c tct b pt cmmc vpmt wg t vp t bft m tpmt t wt? attv, t v tb t ct
wt t t-t z tt c bcpt t tb pt g -v, cg pbcct pc.
B cg t , t tgbt tct ct ptctm t t bct t g g bt tg. hwv, mt bv c tm ctv.
Ct, v pctc cct pcm , wg tt mb b vv gvb. Could a CiTyWide deFenCesCheMe Be iMPleMenTed andCreaTiVely FinanCed, ProTeCTinGThe CiTy FroM any seVere TidalFlood? T pp c b t , vc, tt ttg c w c tccmmt t t t ct.
aTTaCK?T ttck t vc tp w t tg ct. T mvvpmt ptt t b g ct ct b bg t t t wt.T t c t t pw tt ct t tc cmc vtt. atg tv pt t ct t vb tg, c t g tm bft wvpmt twg t k?
W v v m bgt t t wt t v bpctc ct. stt tt wwt t , g tbtb pc v b p t w, w vbg. Ftg tct, m bt tpt, v b g cv tct. l cmt pctc tv m pt tw, ctg w vpmt.
hoW Can These PraCTiCesoF neW Marine deVeloPMenTs BeiMPleMenTed in a susTainaBle
Manner? T ttg attckc ck vt pg t gv bt t tm mc21t CenTury ct. Mv, t ccg w b vpt f t gp m t pmwtt t gw. T cmmccmptt w t b mtc g-tm mgmt pbt.i w vpmt ct ct ttt pp g -v w, tv t ct c b mt gt t cm.
What choices can We maKe? scoping out the options
What iF We LooK at the Long teRm FutuRe oF ouR coastaL cities
anD imagine What stRategies might neeD to be aDopteD? What
choices Do We have toDaY to ensuRe that bY the next centuRY sea-
LeveL Rise WiLL have been manageD in a WhoLLY positive manneR?
theRe aRe thRee bRoaD appRoaches to the FutuRe oF coastaLmanagement: RetReat? DeFenD? anD attacK?
in JuLY 2009, buiLDing FutuRes anD the institution oF civiL engineeRs hosteD
a Design chaRRette, bRinging togetheR a numbeR oF pRoFessionaLs FRom
vaRious ReLevant sectoRs. We haD a seLect gRoup oF top aRchitects, civiL
engineeRs, citY DesigneRs, pLanneRs, DeveLopeRs, poLicY-maKeRs, ecoLogists
anD FutuRoLogists. the bRieF Was to pRoDuce both aRchitectuRaL anDinFRastRuctuRaL Responses to Rising sea-LeveLs; aDDRessing the issue With
ouR thRee pRoposeD FutuRe scenaRios: RetReat? DeFenD? attacK?
W c tw ct t k t c t, t ct
KinGsTon-uPon-hull PorTsMouTh.
T tm w m: reTreaT, deFend
aTTaCK, wt t wg b.
J hm
J hm, ew W, rbt Bk, C P,
Ctp egt, B hm, B am
dck rb,Mk atp,l a (),P
aJ dv,Bt B,M k smt,h lw, nck hm
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case stuDY: Kingston-upon-huLL
Kgt-up-h t 25 m m t nts t t bk t hmb et.T rv h bct t ct, wg mt t t. htc t ct m tt t wt, bt mt cmmc. it ppt 250,000, tpt wtt t ppt t cm. Tct wt mj ctct wgt sc W W.
accg t t act Bt Pt,t Pt h t uK gg-tg pt. rg t-vc pt t ep, scv tBtc tt, t pt bft mww p- cct. h tuK g tw tmb-g pt g c 1.5 m cbcmt tmb, t t g vm t t pct.12
T t rg spt sttg h(2005) tt tt k w t b b t cvg gt cmcg b-g pt.13 hCt Cc cg, W h vb t g, vpmt t Ct ctc t ppt tb gt, cqt t p m t c tCt g tm, tb, tc, bg mgmt k.
T Ct Ptmt ct Pti t t ct eg. it tbtw t t bt b Ptmthb t t wt qt lgthb t t t. T Ct Ptmt ppt 200,000 tgt t t uK. it m pt mc g b cbt cgFm, Gpt, hvt, Pct,
wt cmb ppt ppmt m.
Mc t ct w b t Mt dc t ct m t mj vb. h Mjt nv B Ptmt t gt t uK, wt tw t tc t ckg t. i pk tm t v 17,000 pp wkg t pptg t c cmmt.
M ct, cmmc ppg ct btg t pt v gw t b. T CtCc v vt gfct t pttct t t 30 , wv, tpt p t c cct t t.
FLooDing
o ttg ccttc h ttv t t ct wc gm 2-4 mt bv -v. sm h cm t, bw, -v.
T evmt agc w pt T sg B t t mt t rv h. T pvt g t m
g ptm, ptctg ppmt10,000 pp m g. rct t b btw 8 12 tm w cpt t v b pct.
i 2007 h w v ctb t mm . T w tbtt pg . Cp wt m g g g tt tpgp t ct, t t tg wt, ctg 20% tct g ctg tmt 100m mg t c .
it tmt tt v 8000 100 b w mg. n h c w bc ,bt t ct g tct wb t cp.
FLooDing
T ct v b wt . Mc t ct bt gt p tt wt g, pc t ct ct t ct. T ct tv w g t mjt t 3m bv -v.T tt mt m t g t gfct v. hwv,wt mc t bg cv wt
mpmb c, wt t qckbb t w w w.
a 20% ppt Pti wt t evmt agc z. i t ct c bct w b t wg ptttm z wt.
Mc t bck Pti cmp cm (m tt w ptct). sm t cm w pt, nv ppt, bvpmt, tct ( ), pbc ct.
case stuDY: poRtsmouth
Flood Zones inCludinG surFaCe WaTer risK, 2007 PrediCTed Flood Zones For 2115
T Z 1:lw pbbt
g (< 0.1% 1 1000 )
T Z 2:Mm pbbt
g (0.5% 1 200 )
T Z 3:hg pbbt
g (> 0.5% 1 200 )
T Z 1:lw pbbt g (< 0.1% 1 1000 )
T Z 2: Mm pbbt g (0.5% 1 200 )
T Z 3 :hg pbbt g (> 0.5% 1 200)
lw sc Wt dpt
T Z 3 :hg pbbt g (> 0.5% 1 200)
Mm sc Wt dpt
T Z 3 :hg pbbt g (> 0.5% 1 200)
hg sc Wt dpt
T Z 3b :Fct Fp (> 5% 1 20 )
The CiTy is loW-lyinG
The riVer hull is liaBle
To FloodinGThe CiTy is exTreMely
densely PoPulaTed
MosT oF The CiTy is
siTuaTed on an island
due To iTs FlaTness, TheCiTy has To Be ConsTanTly
drained By PuMPs
The harBours are in
ConsTanT use WiTh
reCreaTional and
CoMMerCial VesselsThe huMBer is a Tidal
esTuary The CiTy is exPosed
To The oPen sea To
The souTh
There are seVeral
naTional MonuMenTs
on The CoasT
MuCh oF PorTsMouTh
harBour is used By The
royal naVy
When a surGe Tide is
PrediCTed, The hull
Barrier is Closed
The PorTs are oF
naTional sTraTeGiC
iMPorTanCe
stegtWt
aptfmhCtyCcsFra(hcw)ocsvy(ittvy)
stegtWt
actBtPt
aptfmPushsFra,
evmtagcyocsvy(ittvy)
stegtWt
stegtWt
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01 T vt t t tm k, t
g t ct t pt w tt
t t t wt h.
02 T tc ct h, m t v
gfct t, w gt t t
g. T w w w t m tg
t t ct ct, ctv bcmg
pm. T w w bt t t
-v m 2010 c tm.
03 T g w t w c
t b t , tw t t
ct, t w mpmt t cp wt t
pct -v .
04 T ct, w , w k t et
Wt h b v pt, tfc bg.
05 T w tt t cm m t wt
g t bk t hmb w vt mv
t . T pt t v b gt , bt
t t b mpv vt.
06 T pg -tt w ct t
p t tck t t ct . it w
bt tt t w c g tp m. T kpt t c tfc
t t ct ct w mg q
v t t ct.
07T w t pt w mt
mpv b t pt w w tk pt t
ct. T ct mtg mpvg t
c w m cmp t t ct ctg
h Pt, wc vt t t uK cm.
08 sc t c pg pc w pt
2010, g tct (c, pt,
tc) w bt t t t wt t ct.
h t t tpgp t w
vpmt t m w.
T tct ct pgmm w
mpmt, mg t ct t
t tmm pp w g. a
cmpt pckg w pt b t
vg cv b t bg mtg
What iF a RaDicaL, Long-teRm pLanning stRategY WeRe impLementeD acRoss the
citY oF huLL? couLD We tuRn the seveRe RisK oF a FLooDeD FutuRe into a positive
attRaction With a Destination-maKing inteRvention? iF We Let WateR into LaRge
sWathes oF the citY, WiLL it aLLeviate the RisK eLseWheRe? W e couLD choose to
save some paRts oF the oLD citY, WhiLe aLLoWing the LoW-LYing LanD eitheR siDe
oF the RiveR huLL to FLooD anD become an inteR-tiDaL saLt maRsh. What WouLD the
citY LooK LiKe? can ResiDents oF huLL see WateR as an asset, not a thReat?
huLL RetReats
w c. T cmpt t t
b t mv, tg t w mt
wt t ppt.
09 T cmpt vpmt pv
g pc, t bt vmt t w p
t rv h w g mv. T mv
mt w cc t t cvc tct
w bg. Wt t gt pt pc
tc, t bk t h w m t
m, bg t t v .
10 rct ct ct w
ct ctvt wt t vvg cp.
11 T m pv cc bbg t
ct v (v) g h. T vgtt
pc b t bb t g t t
g, qt pc ct .
12 T tm gt pc t hmb
pc g g t t t ct .
0105
06
09
10
07
08
0811
12
08
03
02
04
2025
2050
2075
2100
i 2080 t ct w b
nw h pmptg w
vtmt w c
tt t ct
ttt wtg t b gf
b t ct t q
ct. T ct t t mp
m tb vg.
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What iF theRe is suFFicient investment into secuRing hu LLs FutuRe FRom
tiDaL FLooD RisK? couLD a compRehensive, citY-WiDe scheme that encouRages
DeveLopeRs to buiLD conFiDentLY Within the citY be put in pLace? ninetY
peRcent oF LanD in the citY is at RisK FRom FLooDing. WhiLe DeFenDing FRom
sea-LeveL Rise, the RiveR huLL aLso poses a signiFicant thReat anD WiLL neeD
to be aDDResseD. hoW can this DeFence stRategY be FunDeD? peRhaps bY maKing
the DeFence paRt oF a commeRciaL DeveLopment With vaRYing LanD uses.
huLL DeFenDs
01 T h B w kpt pc
mtc mpvmt 2050.
atg ct, t w t ct, t cmmt t tct t m t ct ct.
02 T t tg t ct w ptct.
it bg cmm c w,
t t 21t ct
m v w m b w
tck t w.
03 a twk ck w cv tg t
ct, g m t p-tg wtw
pb. T v kpt bw t
tg ct v, wg gvt t bt
v (v) pv () vt t
t ct v t ck. T tk t p
t pv v-t pmpg tm
tt w pc.
04 T v t w t, twc ,
wt t pmpg tm pc t
pct. T g m t tpp b tpw tb gt.
05 T w t v w g t b
w g pc t w bt vpmt
ctvt t tk pc tp tm. T
vpmt p t t t ct bg
w c.
06 T t t t ct t pt t t t
t w c, wg m p
gwt. T p wt bt c b ct
t w, g tt ckg tm t c.
07 at t ct t ct tg m-
vpmt: cmmc, t
ct. T pmm tt, bg ct
c t t wt w c t t tg
mt t ct ct gt mc t
cpt t t cm vp 2010.
08 rv v b cc g
wt tg b.
09 Wt-b ct ctvt c
cg, g, wmmg tk pc wt
m t v tt t pt wt
v (v) pv ( wt) .
10 W t w tck, pmg t pc
t t v v tc m ct
vtt t t wtt t ct w.
11 F m t m b gct
v pv m c pc t ct. lc
mkt v gw p t bck t
w tb.
01
05
06
09
07
08
03
03
02
04
2025
2050
2075
2100
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What iF We can RecYcLe DisuseD maRine inFRastRuctuRe to cReate
a totaLLY neW WateRFRont FoR huLL, buiLDing out onto the humbeR
estuaRY? the citY couLD FoRm a DiFFeRent ReLationship With
WateR: embRacing it anD beginning to move i ts inFRastRuctuRe
onto FLoating oR stiLt stRuctuRes. DecommissioneD oiL pLatFoRms,
RetRo-FitteD navaL vesseLs, anD smaLLeR houseboat communities
couLD staRt to shape a uniQue anD Distinct FutuRe FoR huLL.
huLL attacKs
01 o cmm nt s ptm w
cc, t t tw p t hmb
t pt t t t bck 2013. atppg t g bck w t m t -
cmmg ptm t g.
02 a w t tt bct wt
cmmt bt p t pt wt m t
tct bg pc.
03 Cmbt ttc ptm tg
tct, ct m - m
tct, w twk tgt
vp t m t, ct
cmmc .
sm tct, c w, wt
p wt tg, w mg
t wt, t t v t m.
it c b cct t t tg
mpv twk.
04 Pg c g t t tw
bg t t wtct c
mgc vct. at t v t g t b cct t t m.
05 eg pv c t t g v t
tm gt pc t hmb b.
06 sm g w ct pt g, tt
ct pc.
07 a cmc cmp m t mt
pctc g, wt uvt t t ct.
T bt - t g t
ptg -ptg v
w mc m mc pg
pc t ct.
08 T ct p t t t-t t
ct tt t b bt b tg cmmt
t ct. Wtt t t wg ct t hmb, t cmmt w m p
m bt. M t w t p
t rv h w c t w t
w ct.
T ct t b w w pt t cp wt
c g. Bg w t-ftt t
cp cg c m t
t ct.
01
05
08
07
06
03
02
04
2025
2050
2075
2100
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01 T M27 tt v t t t wt k
c t t ct m stmpt t
Cct w ct t g b t t t t t ct. atg t ct
w ct, t w m vtmt t
ptctg t tg t m g-tm g.
02 T mj vt t cct t
m M27 tfc t t k .
it v t tg-tfc g t t
ctt v t pt.
03 d t t mptc t t ct
cm, t v b pt t t
wt t ct w mt,
mg t.
04 T tg tt c t t t p
w vv pbc bc.
05 T g t t Pt i w
p t m tt 2010. Wt
20 tb m m w t cctg. it cmpt t
btt w t t g -v. nw t
ct vt b t
t tt k. it bt v w,
cg v pc b.
06 T uK gt b t-m p m
w tb b 2030, pvg v
tm t wk tk. st-m mb
t pmm. T p w b b t mv
t g g t t w .
07 nw vpmt tk pc tp t
g t t t. T tc
v pv cc pp cmmt
m, v t b p m g
c pmm tt w v b c
t z.
What iF the Long coastLine suRRounDing poRtsmouth anD its haRbouRs
becomes too gReat a Length to DeFenD? We couLD RetReat FRom the FRinges
to the higheR gRounD Within the centRe oF poRtsea isLanD. this Loss oF
DeveLopeD LanD WouLD neeD to be compensateD FoR anD neW, teRRaceD
hiLLsiDe settLements on the mainLanD couLD taKe on anD maintain the
existing anD gRoWing popuLation. What LanD uses WouLD be appRopRiate
at the Wet FRinges oF the citY?
poRtsmouth RetReats
08 ov t 21t ct, t tg bg
t g Pt i w tt
m pppt t k. rt bg t w t tp ; ptg t
cc t bv g v kg t
bg tgt tm .
09 T hg i ct w t t vt
t tt wk wt t wt; tc
g mg ttv g pct.
10 at gt ctt t w ccpt tt
t m t mmt c ct
t, w vtb t t t ct. T
m t mt m tm w mtc
pvt g t ptct t pcfc t.
utmt Ptmt i m v t b
b t tt t. hc t
vpmt c t t w
tm-mt ccb.
01
05
06
07
07
08
08
03
02
04
10
09
06
2025
2050
2075
2100
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What iF the totaL Line oF DeFence can be shoRteneD, saving miLLions in DeFensibLe
inFRastRuctuRe? iF the haRbouR entRances aRe pRotecteD bY gates, We no LongeR
neeD to DeFenD the inneR peRimeteR to both haRbouRs. an inhabiteD WaLL couLD Line
this section oF the south coast. the WaLL couLD hoLD the Line, aDvance the Line,
oR RetReat as appRopRiate; ensuRing that the citY is impeRvious to a tiDaL FLooD.
Within anD on top oF the WaLL, DeveLopment couLD taKe pLace, With a commeRciaL
incentive to FunD the initiative anD secuRe Long-teRm investment.
poRtsmouth DeFenDs
01 T w t gt w bt t t bgg
t 21t ct, t ptct t b m
tm t g. Wt mpv mtgt g c b pct p t v
vc, mt mt t t
vt tk w t gt w c.
02 T g ppg t w
ct t t b, t c t tfc
t m t b mt. nv v w
ct t t b w pb t
c tfc.
03 T w w w ctct vg
w, bt wt cmmc, t
ct vpmt. ov twt pgmm t b, ttg Pt i,
vp ptc gmt t w t
vp bt pt t mt. T pvt
pbc mtc pgmm w
pt pc 200 bt, g t
g-tm wtg ppt.
04 T bc tpg t bt w w
t g t w gt t ct.
W t w t w b, t
tck t w c b bt b tt v
t p fc.
05 T w t w pc t
ccmmt w pc vpmt. T
pt c t t ct ct pt w t
pmm, pvg pptt t w, pm
tt. T g v vpmt p t
t t ct t w c.
01
01
05
0302
04
2025
2050
2075
2100
06 T w tt m t ct pc t
w ct pc w t
c. i t pc t mtc ct vb gfct w t tk t g
t t wv.
07 i pc, pk w t t t ct
t t g pm tt w vw
pbc cc t t bc.
07
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What iF the citY oF poRtsmouth, that is aLReaDY shoRt oF
DeveLopabLe space, couLD gRoW out in to the sea in a seRies
oF inteRconnecteD pieRs? these pieRs WouLD be FuLLY
inhabitabLe, LaRge enough to accommoDate meDium-Rise
buiLDings, paRKs anD tRanspoRt LinKs. some pieRs couLD
accommoDate inDustRY, otheRs ResiDentiaL.
poRtsmouth attacKs
01 i 2010 cm w w p g
tw t p tt w mg m t
ct, kg t t tg tt tct. T p w mpmt
v t t 20 , mg t mj
tct t ct t.
T w t t p tfc, wc
t tp t t pt pc.
02 T tp t mt p w vp t
m- ttcp, wt t, cmmc
ct pc.
03 Ftg cmmt bg t ct b
-btw t p wt t t wt
t b.
04 Btw t t p t t t,
m w ct, ptct b t ctv
bkwt t p tt.
05 T t kg Pt i t t
m w t ft t mj tct
jtmt. T m cct w t
bg. Fwg t, vpmt t t t
wt t bg t p j t t.
06 svc c tt cct, ccg
wg ttmt w c cct m
t t p t t t pctv
g pt. T cm w tt
ccm t vg t m g.
07 efct b tmt w t
wg c jb, pc cmmt
ggmt t w vg p.
08 T vb, tg ctct wt
t ct w t-ftt t cp wt c
k . lvg pc w mv pt ttv vct t w t.
Cmmt c b cct tm .
09 nw vpmt wt t k w
bt wt g g v wt m. sm
cm ct tt cmmt t
w b t t tm t w
t wt v gfct.
10 T p w ct g; pg t t
bc c g t.
2025
2050
2075
2100
01
05
06
09
10
07
07
08
08
03
0303
02
04
04
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concLusions
T c pt t pbct bg t cg t
pt w v tt tw ct, pg w
t z tkg. T t ttmpt t f pptt
m mgt t tt p b cmt cg -v .
i c c, t tm tt g m tt
tm m b tk. i w t wk tw t tt g
b t pc, t mt cg q:
communication
W tg p
cmptt, w-qpp b
wt ttgc vvw. i t
uK w g t mv b
t tt q ttwt cmm mt
t t t
tc mttg ck
pt, mbt g-tm
tbt. i t tk
v c pbt
cmmct t m
t pgv c t
t cmt c bg t
mg. T pbc t
b btt qpp t c
gg wt t t t wt
t cmmt.
timescaLes
o tm pg
c mkg ptm
b jt cc
tm tt tct
bt t p t g tm;t 4 ct cc,
t 10-15 c pt
pg mwk, t 10-20
tct vpmt
tm. T t c wt
t g-tm z cmt
cg; cg t ct
tt w pt tmv
50, 75 100 tm, t
p cg pct t
cmt vmt t
w t b pcmt.
F-cg t w
g tm cg,
bt w ct w, wkg
wt g-tm pctv
ttg. W mt vp
mcm tt c tgt
w t k b t
t-tm cc ptcc mkg p mkg.
1 T W Fctbk: Ct itgc agc. ttp://www.c.gv/b/pbct/t-w-ctbk/g/k.tm (lt cc 23-11-2009)
2 Tm t bk t cc g,P r, C-optv Fc svc, octb 2009.
3 Cmt Cg Mt,a ct Bt i,J 2007. ttp://www.cmtw.g.k/tg/607/cmt _cg_f.p
4 nt F rk amt, evmt agc, 2009. ttp://pbct.vmt-gc.gv.k/p/Geho0609BQds -e-e.p
5 rbt rc,h F dc, evmt agc nw Cv eg,agt 2009. ttp://www.c.c.k/w/wt/ bt-c-pg---- /5206306.tc
6 20t Ct g t Tm B, evmt agc,2009. ttp://www.vmt-gc.gv.k/m//105277.p (lt cc 23-11-2009)
7 Fg Tw y o, h Ct Cc,2009 ttp://www.cc.gv.k/pt/ pg?_pg=221,589788&_=pt&_c m=PorTal (lt cc 23-11-2009)
8 T J 2007 h, F rpt b t ipt rvw B,nvmb 2007. t tp://www..c.k/gg/PdF/3 .p (lt cc 32-11-2009)
9 iPCC: Cmt Cg 2007: T Pc scc B. Pg. 409.
10 ut Kgm Cmt Pjct 09 (uKCP09). ttp://kcp09..gv.k/ (lt cc 23-11-20 09)
11 aBi: rv sttmt o Pcp o T Pv o F ic (2008) ttp://www.b.g.k/Pbct/rv_sttmt__Pcp__t_Pv__F_ic1.p
12 ttp://www.bpt.c.k/ct/pt/.tm (lt cc nvmb 2009)
13 Qt h Ct Cc sttgc F rk amt. nvmb 2007. hcw Gp lmt
14 h spt sttg,h Ct Cc, nvmb 2007. pg.8.
15 h spt sttg,h Ct Cc, nvmb 2007. pg.19.
LimiteD ResouRces
T ft c t uK
c m w ct
vw mt
ccpt cg m g. it w
tk g g ttg ctv fc t t v
t pbm. Ptp wt
t pvt ct w b cc,
t w t g tt
t vpmt pptt
ct wc pv
v ppct gtg
cmmc t vt.
MessaGes ToGoVernMenT Flooding needs to be addressed by strong
ptc p.
A long term horizon needs to be addressed,
pb t p t pt
ttg, kg b t-tm ct
cc pvg g-tm v.
New funding mechanisms that seek co-funding
pptt w b t tct
vpmt.
Multi-functional ood defence infrastructures
c b vp tt bft c pp
b.
The planning systems must do more to encourage
tgt t vtv g-tm
c ttg.
MessaGes To
Planners Tackle problems now with POSITIVE and
ProaCTiVe t, t w t t t
t pbm bcm mgb c.
Community engagement in decision-making and
ttg c pt t.
Money should not be wasted on short-term,
tb vpmt mpvmt t
c tt ct b mt.
Long-term planning must provide a framework for
t tm tctc ct.
Solutions must be considered that cross local
gvmt cmmt b.
More action must be taken behind ood defences
t tt t cqc pb
g mmz cg t-v
ttg c tc ( t
Jt ittt g pc).
Take full consideration of the opportunities
w cg, p c
t c pbt tt, ,
ttck ttg.
MessaGes ToarChiTeCTs,enGineersand urBandesiGners Consult and communicate with all relevant
tk m t BeGinninG t g
pc pc t evmt agc.
Schemes should seek to fully exploit the amenity
ptt wt, wtw wt t
b vmt.
Inform the developer/client of development
pptt tt c b ct tg ctv
cmmc vb mgmt
tm, cgg tgt, mt-ct
cmc vtg t.
Design-led approaches to ood risk management
t m c c t
tc mgmt k, cmbg c
m t vt t mpct . Structural measures, particularly defence
wk, v cctg pt
cmmt m t pv
v ( w pb pc) ctt
btw t cmmt v ct.
New development or regeneration should be seen
pptt t cg tg
b t mk pc wt.
MessaGesTo PuBliC The coastline has always been dynamic and
cgg: tt wt m t uK mc-v
ct t 1000+ , t , b,
p t wt t t.
Letting water in can be seen in a positive light
t tt pc.
Designers, engineers and planners are beginning
t w t btt cct vpmt t
wt ct w.
Access and proximity to water brings signicant
c cmc, w vmt
bft, pvg m pt b
vmt, gt pbc mt
cctg pp wt, w bgbtt w t ptct c m b
m k.
Flood defence does not stop at a barrier existing
w m c b m m t
tt t g, b pt
tgt cmmt ct-w ttg.
Individuals can make a difference, providing
kw g tt t g
t ppt pmb t wt,
tg c m, tg
g kg t vt wt.
Flooding is a long-term threat to coastal towns
ct, qg g tm v -
cg t. T w ct t t
. o t c cmmt t
m gt vv w t ttg t ct
c pt .
FuRtheR ReaDing
Jont Pocy sttmnt on Mngng
ubn Foo rk. (octb 2009).
a ttmt b t iCe, CiWeM,
riBa, riCs, rTPi, rusi t
lcp ittt.
Foo-poof o fo t ft:
a compnm of gn. riBa
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dgnng Fo Foo rk: riBa
Cmt Cg Tkt. riBa (2009)
Foong: engnng rnc.
ittt Cv eg.
(J 2008)
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Foo Ft. Bg Ft
riBa. (2007)
Pnnng Pocy sttmnt 25:
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Pctc G. dptmt
Cmmt lc Gvmt.
Bng btt nvonmnt: a
g fo vop. (Pctc
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T lfe Pojct: long-tm
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T lfe hnbook. Bc
actct Bre deFra
(2009). ihs Bre P.
thanKs
o tk t t mb
p w ptk t
g ctt w m t
t cmt w tt
t. ic w: B am
J hm(n am,
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rbt Bk (BaCa actct,
le); P T dv (uvt
et ag); nck hm
(evmt agc); at l
(T act, Ccp); J
Mckz (V o); K v s (Fmt actct); Kt
Tp (dptmt Cmmt
lc Gvmt); h lw
(W M Tt).
o tk t Fmt actct
w k t t pc t t
t ctt.
F, tk t t oc
sv w k pp t
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8/4/2019 Facing Up to Rising Sea Levels Document Final
15/15
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