River mersey case study Flashcards
1
Q
how long is the river mersey
A
70 miles
2
Q
where is my data from
A
above the Guaging station of Ashton Wier
3
Q
what places are most at risk
A
Sale, with over 500 properties at risk
4
Q
what is the geology of the river mersey
A
in the west it is highly permeable
5
Q
what helps to reduce the flood risk
A
- upper Mersey has 67km of raised defences
- appropriate development of the floodplain e.g golf
- flood risk management
6
Q
what are the characteristics of the river mersey
A
- mix of rural areas and urbanised
- home to 1.2 million people
7
Q
what is the rainfall like
A
- high in the east which is rural
- indicating relief rainfall due to highland
8
Q
what are the causes of flooding in the river mersey
A
- upper catchment is steep and heavily urbanised
- river response time is 2 hours
9
Q
what is flooding like in the river mersey
A
- urban areas have a low infiltration rate
- upper Mersey is prone to flooding, in 1965 the banks were breached
10
Q
how is the river Mersey being managed
A
- flood alievation scheme (water is taken,stored then put back)
- 3 storage areas In sale
- warning systems
- awareness
11
Q
how does the river Mersey impact on the local cycle
A
- urban areas the water course has been channelized, straightened in lone with concrete
- upstream there is a reservoir which reduces the flow
- the marsey catchement has operational washlands (floodplains) which provides sustainable flood risk managagement
