River Exe Flashcards

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1
Q

Where is the River Exe’s source

A

Exmoor

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2
Q

Where is the River Exe’s mouth

A

Exmouth

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3
Q

How long is the river

A

82.7m

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4
Q

Which area do we look at

A

the upper catchment which is above the gaugin station in Thorverton

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5
Q

How much of the catchment is underlain by impermeable sandstone

A

84.4%

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6
Q

How much of the land is Grassland

A

67%

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7
Q

How much land is woodland

A

15%

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8
Q

Where are the peat bogs located

A

on the high ground of Exmoor

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9
Q

How much rainfall

A

1295mm

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10
Q

How much of the rainfall becomes runoff

A

68%

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11
Q

What is dug into the peat bogs which help causes higher inflation

A

drainage ditches which are often saturated and limit infiltration

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12
Q

What was the name of the reservoir that was constructed

A

Wimbleball

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13
Q

What does the reservoir do

A

help regulate the flow of the river

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14
Q

Where in England is the river

A

South West

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15
Q

What is the size of the catchment

A

601km^2

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16
Q

Name of tributory river

A

River Haddeo

17
Q

how many houses are at risk of a 1 in 100 year flood

A

10%

18
Q

Which city does it pass through

A

Exeter

19
Q

how much of the land is arable farming

A

10%

20
Q

How much of the land is peat bogs

A

3%

21
Q

How much water do the peat bogs store after the restoration

A

1/3

22
Q

Physical causing of flooding

A

Steep slopes
Underlying impermable sandstone
High levels of rainfall

23
Q

Human causes of flooding

A

Land use - sheep farming/game shooting - compacting soil, deforestation may be needed
Imperable surfaces/urbanisation
Digging drainage ditches - reduces storage of water, more run off

24
Q

Human interventions

A

Exmore myers project (blocking drainage ditches) - more water is stored
Wimbleball resovoir