river landscapes Flashcards

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1
Q

where is the case study?

A

river teme in Tenbury

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2
Q

what hard engineering method was considered but rejected? why?

A

flood wall but was rejected because it cost £5 million

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3
Q

so what soft engineering method was chosen? how much did it cost?

A

air bricks, flood bags, cellar pumps, raised sockets, flood boards
£400,000

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4
Q

what are the effects of flooding in a named place?

A
mozambique in feb 2000
800 killed
250,000 with diarrhoea 
20,000 cattle 
275 million damage
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5
Q

how could predict and prevent flood damage?

A

flood alert text, flood plans for homes, know your warning signs, evacuation routes.

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6
Q

what are the definition of a drainage basin?

A

the area of land drained by a river

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7
Q

definition of a water shed?

A

high land which separates one river from the next

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8
Q

definition of a confluence?

A

where 2 rivers join

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9
Q

definition of a tributary?

A

small river joins a large one

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10
Q

what is mass movement of soil creep?

A

soil repeatedly freezes and thaws, overtime it melts and causes it to expand and contract, soil slowly moves downhill due to gravity

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11
Q

what is the mass movement slumping?

A

soil gets wet from the water - breaks from the land - soil gets heavier - soil slumps due to gravity causing a landslide

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12
Q

describe the river at the source?

A

narrow,shallow,slow

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13
Q

what is the river like at the mouth?

A

very wide, deep, fast

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14
Q

how do V shaped valleys form?

A

stones erode river bed and becomes deeper, weathering at top and rocks at top erode away

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15
Q

how is a oxbow lake formed?

A

meanders are eroded away, then finally erode through the neck, breaks off from river leaving a oxbow lake and a meander scar

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16
Q

what is alluvium?

A

sediment depositors by river - often in the flood plain

17
Q

how are levees formed?

A

river floods and drops alluvium it’s been carrying on edge of river

18
Q

what are 5 physical factors cause flooding?

A
  • tres lose leaves
  • clay soil
  • steep slopes
  • winter
  • thin soil –> will infiltrate into soil faster - surface runoff will be faster - log time will be shorter
19
Q

what are 3 human factors that cause flooding?

A

building a city
farming
deforestation- less interception so the rain falls straight into soil

20
Q

what is a type of soft engineering method to stop flooding?

A

plant more trees - more interception

21
Q

what is a mixture of soft and hard engineering method to stop flooding?

A

widen and deepening it

22
Q

how many times has it flood in tenbury wells in 50 years?

what in 2007?

A

15 times

flooded 5.97m