CASE STUDY 11 : FLOODING (LOCAL SCALE) CASE STUDY - HOE STREAM

Question 1

LOCATION

Answer 1

WESTFIELD AREA, TRIBUTARY OF RIVER WEY
SOUTH WOKING, SURREY
SOUTH EAST ENGLAND
, NORTH EAST OF MAYFORD

Question 2

CAUSES - 4 POINTS

Answer 2

URBANISATION
DEFORESTATION
GLOBAL CLIMATE CHANGE
RAINFALL INTENSITY AND DURATION

Question 3

STRATEGIES - HARD ENGINEERNG

Answer 3

BUNDS/EMBANKMENT TERRACES - BLEND WITH ENVIRONMENT, BUILT UP THE FLOOD PLAIN AND STRENGHTENED THE SIDES OF THE CHANNEL AND PROVIDE EXTRA CAPACITY FOR FLOOD WATER. GRASS NEEDS CUTTING.

FLOOD WALLS - DEVELOPED BY SPECIALIST PROTECTS 200 PROPERTIES IN THE BARNSBURY ESTATE FROM FLOODING BY BEING A BARRIER. EXPENSIVE TO BUILD BUT VERY EFFECTIVE.

Question 4

DATES

Answer 4

COMPLETED IN 2012

Question 5

REASONS FOR SCHEME

Answer 5

PUT IN TO PROVIDE FLOOD DEFENCES FOR UP AT 1 IN 100 YEAR FLOOD EVENT.

Question 6

COST

Answer 6

£44 MILLION

WHOLE AREA REGENERATED AS WELL AS THE FLOOD DEFENCE PUT IN.

Question 7

REGENERATION OF THE AREA

Answer 7

NEW COMMUNITY FACILITIES
NEW PARKLAND AREAS AND RECREATION GROUND
FOOTPATHS
CLEARING UP OF THE TOXIC TIP SITE
CREATION OF NEW WILDLIFE HABITATS
WIDENED ROAD AND NEW BRIDGE (HIGHER SO ROAD DOES NOT GET FLOODED)

Question 8

STRATEGIES - SOFT ENGINEERNG

Answer 8

AFFORESTATION - CHEAP AND ATTRACTIVE HOWEVER, NOT AS EFFECTIVE AND TAKE LONG TIME TO GROW.

OVERSPILL PONDS - ARTIFICIAL PONDS - PROVIDE EXTRA CAPACITY FOR FLOOD WATERS AND ARE ATTRACTIVE HABITAT FOR ANIMALS

Question 9

STAKEHOLDERS

Answer 9

LOCAL COMMUNITY GROUPS eg 7TH WOKING SCOUTS

NEW SECONDARY SCHOOL BUILT TOO

COMMUTERS - LOTS OF TRAFFIC DISRUPTION DURING BUILDING OF THE NEW BRIDGE

BARNSBURY RESIDENTS -

LOCAL ENVIRONMENT GROUPS - NEW TREES WERE PLANTED AND THE OVERSPILL PONDS ATTRACT WILDLIFE

Question 10

CAUSES OF FLOOD - URBANISATION

Answer 10

• WOKING BECOMING A BUILT UP AREA OF LONDON AND NOT COUNTRYSIDE. INCREASING NEED FOR HOUSING WHICH IS MORE IMPERBMEABLE SURFACES = MORE SURFACE RUN OFF. QUICKER SURFACE RUN OFF = LESS WATER INFILTRATING SOIL.

Question 11

CAUSES OF FLOOD - DEFORESTATON

Answer 11

• 15 YEAR PLAN TO REMOVE 100ACRES OF WOODLAND AND HENCE WOKING PARK AREA HAS BEEN DEFORESTED DESPITE ARGUEMENTS FROM COUNCILLOR. TREES SLOW DOWN THE COURSE OF WATER GETTING TO RIVER. VEGETATION INTERCEPTS RAINFALL AND REDUCED SURFACE RUN OFF

Question 12

CAUSES OF FLOOD - RAINFALL INTENSITY AND DURATION

Answer 12

AFFECTS RIVER’S DISCHARGE AS THE AMOUNT OF RAINFALL WILL AFFECT WHETHER THE SOIL IS SATURATED AND IF NO INFILTRATION AND MORE SURFACE RUN OFF . IN 2014 SOUTH EAST ENGLAND SAW IT’S WETEST WINTER SINCE 1910

Question 13

CAUSES OF FLOOD - GLOBAL CLIMATE CHANGE

Answer 13

• INCREASES IN GLOBAL MEAN TEMPERATURES ARE CHANGING WEATHER PATTERNS AND FOR UK LEADING TO HIGHER RAINFALL INTENSITY AND HIGHER VOLUME = SURGE IN AMOUNT OF DISCHARGE AND SURFACE RUN OFF