urban drainage

Question 1

3 ways to describe urban surfaces

Answer 1

-impermeable
-steep sloping
-low infliltration

Question 2

what is catchment management

Answer 2

ctahcment management looks at the interactions between water and its surrounding land and tries to reduce issues associated with urban drainage

Question 3

water movement through urban catchments on the hydrograph

Answer 3

high peak discharge
short lag time

Question 4

3 types of catchment management

Answer 4

dredging
dams/resevoirs
flood defences/channel management

Question 5

what is dredging

Answer 5

dredging is the removal of sediments in the channel using machinery to deepen the river alowing smoother flow

Question 6

negatives of dredging

Answer 6

causes water to move more turbulently enhancing flood risk further downstream

Question 7

what are dams/resevoirs

Answer 7

dams manipulate water flow and act as a water store and source

Question 8

negatives of dams/ resevoirs

Answer 8

creation of resevoir is environmentally degrading by eroding large valleys

Question 9

what are flood defences/ channel management

Answer 9

the physical alteration f the chanel
e.g channel straightening, flood walls, drainage pipes

Question 10

negatives of flood defences/channel management

Answer 10

worsens flooding downstream e.g drainage pipes rapidly remove water
expensive
reuire maintenance
environmentally damaging

Question 11

what are SUDS

Answer 11

SUDS are systems designed to control the flow of water through urban settlements sutainably using natural drainage rather than construction and machinery

Question 12

3 types of SUDs

Answer 12

green roofs
retention pond
wetlands

Question 13

positives of wetlands

Answer 13

detain flow
remove urban pollutants
increase biodiversity of the area

Question 14

negatives of wetlands

Answer 14

vulnerable to high sediment inflows
require baseflow

Question 15

positives of retention ponds

Answer 15

hold stormwater
remover urban pollutants

Question 16

negatives of retention ponds

Answer 16

no reduction of run off volume
high land take

Question 17

positives of green roofs

Answer 17

infiltrate and retain precipitation
ecological and aesthetic
work in high density environments

Question 18

negative of green roofs

Answer 18

costly
inappropriate for steep roofs
require maintenance

Question 19

aims of the river chess project

Answer 19

reduce flood risk
create aqau-scape by increasing channel capacity
create consistent flow to alleviate flood risk

Question 20

actions of the river chess project

Answer 20

increase depth of the 100-metre channel using coir rolls
remove trees to improve lighting and reduce risk to properties

Question 21

attitudes and support of the river chess project

Answer 21

organised by the Buckingham City council
worked alongside local clubs and estates
support from local stakeholders

Question 22

aims of cheonggycheon river project

Answer 22

reroute traffic
create green space social sustainability
revive the history and culture
reduce density

Question 23

actions of the cheongycheon river project

Answer 23

concrete cover dug up
widening of the channel

Question 24

attitudes to cheongycheon

Answer 24

business owners did not agree

Question 25

result and success of the cheongycheon river project

Answer 25

created habitat for widlife
average daytime temps dropped 4’C

Question 26

how much did korea river restoration cost

Answer 26

380 million won

Question 27

how long did it take (cheongycheo)

Answer 27

2 years

Question 28

how have curitiba protected themself from flood risks

Answer 28

located parks alongside riovers and river basins and protected the land

nearby woodlands slow infiltration opf rain and use it lowering the peak discharge

lakes in parks act as storage points

Question 29

how much green space does the WHO recommend

Answer 29

16 metres squared