G1 Rivers

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2.4 How much precipitation is returned to the Oceans?
1/3
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2.4 How much water is evaporated, transpired or infiltrated?
2/3
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2.4 How much water can interception remove from the system?
30%
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2.4 What are river regimes?
Variations in river runoff or discharge over the course of the year
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2.4 What are rivers in humid environments fed by?
A constant flow of groundwater
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2.4 What climate does the River Vascao have?
Mediterranean
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2.4 What climate does the River Congo have?
Rainforest
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2.4 What glacier used to feed the Slims river in Canada?
Yukon's Kaskawulsh Glacier
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2.4 What river does the Kuskawulsh Glacier now feed>
The Alsek River
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2.4 Dartmoor National Park was a high density drainage basin. Why?
It is characterised by impermeable rock- Granite.
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2.4 How does Weather affect hydrographs?
Intense storms with heavy rainfall = flashy hydrography. Steady rainfall = subdued hydrograph
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2.4 What are spatial variations in river regime?
Discharge changes from place to place
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2.4 What are spatial variations influenced by?
Climate, geology, land use and river management of the area
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2.4 What are temporal variations in a river regime?
Changes over time
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2.5 How many people in England and Wales are now at risk of coastal or river flooding because floodplains have been built on?
5 million
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2.5 How many properties in England and Wales are now at risk of coastal or river flooding because floodplains have been built on?
2.3 million
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2.5 What causes groundwater flooding?
Continuous rainfall for a long period of time
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2.5 How long can grounwater flooding last?
days or weeks
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2.5 When was groundwater flooding a problem in France?
2001
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2.5 What French drainage basin was affected by groundwater flooding?
Somme Basin
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How long did flooding last in the Somme Basin?
2months
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When did Groundwater flooding affect Lewes, East Sussex?
October 2000
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How many houses were flooded in Lewes?
600
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How many businesses were flooded in Lewes??
200
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What dam failed in July 2007? Where was it?
Ulley dam in South Yorkshire?
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How many villages were threatened by the failure of the Ulley dam?
3
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How many people were evacuated in July 2007 due to the failure of the Ulley dam?
700
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How many people died when the Coedty dam in Snowdonia failed?
17
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When did the Coedty dam fail?
1925, when 660mm of rain fell in 5 days
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What causes flash floods?
excessive, localised rainfall
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How much rain fell over Boscastle in August 2014?
185mm
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By how much did river levels rise by in the Boscastle flash flood of August 2014?
2m in 1 hour
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What is fluvial flooding?
River flooding when discharge exceeds the channels capacity
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How much rainfall fell over Western England, Wales and parts of Scotland in July 2007?
150mm (2-3 times the average rainfall)
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What caused the heavy rainfall in July 2007?
The position of the jet stream, it travelled south of the UK instead of its usual northern place
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How did the Ocean affect ainfall in July 2007?
Abnormally high Atlantic sea-surface temperatures increased evaporation
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How much rain did Tewkesbury receive on the 20th July?
80-90mm (2 months worth)
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Where is Tewskebury located?
Gloucestershire, at the confluence of the Avon and Severn
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How many people were stranded on the M5?
10,000
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How man people spent the night at Gloucester railway station when the railway network failed?
500
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Where were temporary defences erected? why?
Walham electricity substation- to prevent 500,000 people losing electricity
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How many people were left without power for 24hrs in Gloucester?
42,000 Castle Meads power substation shut as a precaution
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How many people died?
13
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How may people were left without ater supply for 8 weeks?
350,000
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How much did the Tewkesbury flood cost?
£140 million for local councils
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When did a deepening slow-moving depression cross Northern England?
25th July 2007
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How many properties were inundated in Hull?
7,800
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How many homes were evacuated in Hull?
10,000
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How many people were affected in Hull?
35,000
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What % of schools were damaged in Hull?
95%
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How many businesses in Hull were affected?
1,300
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Why was Hull vulnerable to the flood?
Low lying land (90% below high tide level) and large parts built on reclaimed marshland
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How much of Bangladesh is 1m above sea level?
70%
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Other cards in this set

Card 2

Front

2.4 How much water is evaporated, transpired or infiltrated?

Back

2/3

Card 3

Front

2.4 How much water can interception remove from the system?

Back

Preview of the front of card 3

Card 4

Front

2.4 What are river regimes?

Back

Preview of the front of card 4

Card 5

Front

2.4 What are rivers in humid environments fed by?

Back

Preview of the front of card 5
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