rivers- Mississippi river

Question 1

when did it flood

Answer 1

2011

Question 2

how many people evacuated

Answer 2

25,000

Question 3

3 hard engineering methods:

Answer 3

1. raised leeves
2. straightening river channel
3. dams

Question 4

raised leeves

Answer 4

raised 15m and strengthened to enclose the river channel for a stretch 3,000km

Question 5

straightening river channel

Answer 5

meanders cut through a stretch of 1,750km which caused fast-flowing straight river channel

Question 6

dams

Answer 6

the flow of main tributaries- ohio river has 100 dams

Question 7

3 soft engineering

Answer 7

1. afforestation
2. safe flood zones
3. washlands

Question 8

afforestation

Answer 8

trees planted in Tennessee valley- to intercept some if the rainfall and stabilise soils

Question 9

safe flood zones

Answer 9

building to floodplain areas. rock island housing been built on floodplains. building destroyed and demolished

Question 10

washlands

Answer 10

in 2011
Morganza spillway- opened to flood around 12,000km of farmland in Louisiana deliberately,
prevented water from reaching new orleans

Question 11

hard- straightening river channel

+and-

Answer 11

+ made water more more faster through the flood prone area
- cause flooding downstream
not sustainable

Question 12

hard- dams

pos and neg

Answer 12

pos- trap and store water, generate electricity
neg- water evaporated in desert heat and slit trapped
not sustainable

Question 13

soft- afforestation

pos and neg

Answer 13

pos- increase interception and uptake of water through soil
neg- trees take too long
sustainable

Question 14

washlands-soft

pos and neg

Answer 14

pos- preventing water from new orleans. water allowed to flood naturally
neg- large amounts space