Flood management.ppt

8/17/2019 Flood management.ppt

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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



Floodplain


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

Flood management.ppt

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