Post on 06-Jul-2018
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Flood Management
‘A river is managed to provide a water supply
and control flooding.’
Today this may also include the potential for
recreation and tourism.
(Pages – 30 to 37 of Knill and Smith)
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HARD large scale !structural" engineering
pro#ects e.g.s Dams$ %utting Meanders.
&'amples include ( ga)ions !roc* armour"$
groynes and wing dy*es.
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+ing Dy*es
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SOFT = Avoids the need for bilding
dams et!" #$am%les in!lde land se&oning' tree %lanting"
Sstainable evelo%ment = %rote!ting
and !onserving the environment for the
long term' at a reasonable e$%ense"
Taes in to a!!ont the needs of thelo!al %eo%le"
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,hoto -nvestigation
Tr* and de!ide +hat t*%e
of flood management
te!hni,e is being sed
in ea!h %hotogra%h
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-Soltions. to flooding
Plant vegetation(in!rease
eva%otrans%iration /
this red!es the
amont of +ater thatrea!hes the river)
red!es the lielihood of ftre flooding
red!es the im%a!t of ftre floods
on!rete beds
and bans(in!rease the
velo!it* of the
river)
1iden and dee%en !hannel (to in!rease the !a%a!it* of the river)
Flood%lain
2oning
Flood relief
!hannels(these in!rease
the !a%a!it* of
the river b*
!reating more
!hannels)
ams(these !ontrol the flo+ of
the +ater in the %%er!orse and ths red!e
flooding" e"g" on&ere on
the hone)
Flood
+arning
s*stems
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Floodwalls
Shre+sbr*
1
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&m)an*ments and levees 2
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%onstruction of the River +itham Flood
em)an*ment improvement$ near incoln
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Dredging 3
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elief hannels
iver #$e
4
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4oghton 5roo
Flood Alleviation
S!heme – #%%ing
Forest
Flood /torage
Reservoir
5
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Flood Meadows6
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Aforestation and
contour ploughing
7
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Flood proofing 0
1or*
8
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Flood ,lain 2oning 9
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Floods every 20 years
Floods every 50 years
Floods every 100 years
Floodplain
Floods every 200 years
6at!h the t*%e of land se to the most a%%ro%riate
flood ris area"
hosing s!hool offi!es rogh gra&ing+arehosing
Flood%lain &oning
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Flood +arnings
10
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Meander straightening
11
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Do 3othing44444
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Wetland and river bank conservationand restoration
Page 36
‘Reduce and transfor! t"eadvantages of natural fors of floodprotection#
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Flood+alls Flood inter!e%tions!hemes (flood
meado+s)#mbanments andlevees
Flood Abatement (in!l"afforestation)
hannel m%rovements Flood %roofing (e"g"tem%orar* flood gates forhomes)
elief hannels Flood%lain 2oning
Flood storage eservoirs Flood %redi!tion and+arning
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Straighten rivers andmeanders
o nothing8