4.7 Flashcards
Name one case study for a flood in a town
Sheffield June and July 2007
Sheffield floods physical factors
Antecedent rainfall and saturated ground
Situation at the foot of the Pennine hills with lots of relief rainfall
Sheffield lies at the confluence of three rivers, with backwash from one to the others when it overflows
Sheffield is surrounded by steep relief with lots of surface run off
Sheffield lies in a circular drainage basin
A depression caused heavy rainfall
Sheffield lies on moderately impermeable sandstone
Sheffield floods human factors
It is an urban city with lots of impermeable concrete and tarmac
There was an issue with the drainage system and they were too small to hold the amount of rain water
Fallen trees blocked the rivers which had not been cleared up
There was a lack of river defences
There were changes in gardening trends with less grass and vegetation and more patios and decking
