Rivers, Floods and Management
- Created by: stephloupoole
- Created on: 24-04-14 18:10
Tewkesbury - July 21st 2007
Tewkesbury Gloucestire – on the river Severn, severn Ham (nature reserve) Confluence – River severn, Avon Tirle Brook and Carrant Brook
- Population of 10,000- 800 properties - Highest recorded rainfall - £40,000 to pay for damages - 900 yr old abby
PHYSICAL CAUSES. - 90 mm fell on Friday 20th July 2007- River rose to a new record 5.43m - The river severn catchment area 6900km2 + River Avons Catchment area 4500km2 = 1 trillion litres of water - Anticedent rainfall à saturation of land = flood - 200% of average rainfall fell in may june and july - The river Carrant Brook, Tirle Brook and Swirlgate peaked before River severn and Avon
HUMAN CAUSES - Tewkesbury is built on a FLOODPLAIN (wheatpieces community court) - Abby terrace is known for flooding - Poorly maintained drainage = not enought money spent on drainage system
WHO WAS AFFECTED? - Water treatment plant ‘Mythe’ was at risk although was on higher ground than rest of Tewkesbury o Electrical Fire risk so Plant was shut down o No fresh water to Houses, o Bowser was distributed through the town o 1,100 lories loaded with bottles of water to help distributiono This cost 7 trent £25 million - Insurance Companies Increased Premiums as there was a greater flood risk in Tewkesbury.
REDUCING RISKS?- £4 million, gates Bank, walls in Upton on severn o Cost benefit analysis 1. Technically possible 2. Environmentally acceptable 3. Economically viable o Cheaper to run – 2 people a gate compared to 20 people - Disused railway to be removed - Lightweight furniture rather than heavy furniture to ease movability - Ponds flowerbeds and permeable paths put in to housing areas to encourage drainage- Warnings and monitoring systems - Flood gate is temporary - Moving sockets up walls in houses- Raising cupboards and shelving - Removing carpets and placing in tiles
York - 1st - 11th November 2000
York, North east England, River OUSE flows through the city Confluence – River Ouse, Foss and Nidd
- Population of 181,131 - 3000 people eveacuated - Steep drainage basin
PHYSICAL CAUSES. - Several depressions ‘swept’ across Northern Britain - 35 – 40mm of rain fell in 24 hours - Antecedent conditions - The river ouse was 4.8m higher than ususal o Caused the York racecourse to be flooded completely = no racing
WHO WAS AFFECTED? - 3000 people evacuated from their homes - Army was called in to assist evacuation (£41,000) - Fire service was brought in to assist too (£100,000) - Between 2000 and 2010 one insurance company in York payed out £12.5 million in flood damage claims - 800 claims to insurers at an average of £25,000 per property - City of York Council spent £1.3 million for protection of the city ( i.e sandbags) o The council has been able to claim back from the government (£12,228,000) but still has to find (£722,000) from their own resources. - 200,000 less vistitors to York led to £10 million loss of income to local tourist sites.
REDUCING RISKS? - A flood retention basin was created it can hold up to 2.3 million cubic metres of water in CLIFTON INGS. - Embankments were built infront of houses - Flood walls replace garden fences on the rivers edge - River was straightened and lined - Buildings have been adapted (eg ground floor is now carparks) - The Foss barrier stops water travelling back up the river, which would flood the historical parts of the town - John Prescott a British Politician pledges a new national recovery team to help flood victims, with the promise of £51 million extra in funding for flood defences and warning systems. o He also promised that he had asked insurance to pay out quicker
Thames Berkshire, Berkshire 2013 -2014 floods
Berkshire – the Thames goes around the border of Berkshire Kennet and Avon canal passes through Berkshire, the Kennet flows into the Canal
- Windsor Castle is in the County of Berkshire - No county Council – non metropolitan county
PHYSICAL CAUSES. - Extreme weather with high amounts of rain - 80mph winds - 1.5 inches of rain
- Antecedent conditions
HUMAN CAUSES - Majority of the Towns have been built on the river’s edge o The towns were built on the River Thames Floodplain, creating impermeable surfaces meaning water cant percolate through the soil - An artificial river was created called the Jubilee river this was created to bypass the river Thames but this made flooding more prominent downstream
WHO WAS AFFECTED? - 1700 people were left with no power for more than 6 hours - 100 troops were brought in to assist evacuations - 3000 sandbags were used to protect electricity substations
REDUCING RISKS? - No longterm solutions as such at the moment - But sandbags and smaller defences have been put in to protect against more power cuts.
Worcester - 2013 - 2014 Floods
Worcester the river Severn runs through it, connects with the Worcester and Birmingham Canal
-17 miles southwest of Birmingam - 23 miles north of Gloucester - Population of 100,000
- The River Severn Runs through the middle of the city over looked by the Worcester Cathedral
Physical Causes? - North Atlantic Jet stream is unusually strong - Increasing Strong Atlantic Storms - Intense Rainfall - River Severn was at its highest level in recent years, 5.67m above the highest reached level in 2007
Human Causes? - The city was built on the edge of the River Severn
Who was affected? - Nearly 10,000 homes were at risk of flooding - 2,723 homes were deemed at risk in worcester itself - The most at risk was South Worcestershire - 21 Flood Warnings for Worcestershire along the Severn, Avon and Wyre - Major roads in city centre had to shut - Many Buildings were shut such as the Hanley Castle High School - the Main city bridge was closed - Otters were affected too as they were spotted in the city canal rather than the River Severn itself - 50 homes were flooded
Reducing Risks? - Pumps were put into place to remove water - Troops from the Royal Irish Regiment were deployed to provide extra support for flood victims - Worcester city council launched a £50,000 hardship fund - The environment agency are trying to put more of a focus on flood protection - Since storms in 1998, lots was done to homes to protect them which kept many homes dry
Bradshaw Model
The Bradshaw Model is a geographical model which describes how a river's characteristics vary between the upper courseand lower course of a river.
Landform of Fluvial Erosion and Deposition
Deltas
- a feature of deposition, located at the mouth of a irver as it enters a sea or lake
Bangladesh Delta - Arcuate Delta
Nile Delta - Arcuate Delta
Mississippi Delta - Bird Foot Delta
river rejuvenation
City of Durham - incised meander
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