R - River Derwent Flashcards
When was the River Derwent flood?
March 1999
Where is the River Derwent located?
Yorkshire
Give 5 reasons why the River Derwent flood occurred.
.Large scale drainage of the ‘Wet vale of Pickering’ to create arable farmland
.River Derwent was straightened to move water downstream more quickly
.’Old Bridge’ linking Malton and Norton created obstructions
.As town developed, flood plain was built on my industries
.270mm of rain between in early March
How did draining the ‘Wet vale of Pickering’ help the River Derwent to flood?
Because this means the water feeds into the river more quickly, causing River Derwent to flood quicker
Why does building industries and outlets on the flood plain of River Derwent, cause it to flood more easily?
These will all be impermeable surfaces, resulting in more surface runoff, meaning less water being soaked into the ground, therefore the town floods more easily
Give 2 examples of impermeable surfaces that will help River Derwent to flood?
Supermarkets and Car Parks
How much rain fell in early march of 1999, which lead to the flooding of River Derwent?
270mm
Why did so much rain fall near River Derwent in early March?
The area was being affected by a very deep area of low pressure - depression
Give 3 examples of flood management used near Malton and Norton.
.Land has been set aside upstream from Malton to be allowed to flood - a ‘wash’
.Flood walls have been built to protect vital commercial interests (York to Scarborough railway)
.Embankments (examples of artificial levées) used to protect the Old Church in Malton
How does a ‘wash’ prevent flooding?
Land is put aside to be allowed to be flooded, so water soaks into the ground more quickly rather than flooding into the river
Which 2 features near River Derwent have been protected and by which flood management techniques?
.York to Scarborough railway by flood walls
.Old Chruch in Old Malton by embankments
How many houses were flooded in the River Derwent flood of 1999?
150
Why and for how long, had the York to Scarborough railway been closed for?
10 days because ground beneath the railway had been washed away
In which road link had there been a detour as a result of the River Derwent flood, and how long was the detour?
The road link between Malton and Norton had been flooded and there was a 20 mile detour
