Brock Vs Exe Flashcards
Catchment (Brock)
Lancashire
Source and point of confluence (Brock)
Fair Snape - river Wyre (micheals on wyre)
length of river (Brock)
17.8km
physical features in the North (Brock)
peat bogs on highmoore
millstone hills
steep sided valleys
physical factors in South (Brock)
limestone
boulder clay
flatter land
name of the agricultural college (Brock)
Myerscough
how much water is the agricultural college licensed to extract? (Brock)
45.45 m2
what factors contribute to the high flood risk? (Brock)
steep sided valley (N)
flatter in the south
typical water levels (Brock)
0.12m - 0.95m
highest recorded water levels (Brock)
4.29m
flood protection N of St Michael’s (Brock)
flood storage - 1/50 yr flood
flood protection before brock meets wyre
strengthened embankment
what frequency floods are there warnings for? (Brock)
1/5 yr floods
how many sandbags did the council have available?(Brock)
2000
what frequency of flood are there warnings for in the low value land, South of St Micheal’s? (Brock)
1/100 yr flood
catchment (Exe)
Devon catchment
source and mouth (Exe)
hills of Exmoor to Exeter
length of the river (Exe)
82.7km
what is the name of the resevoir built in 1979? (Exe)
Wimbleball resevoir
where was the wimbleball resevoir built?
and what is its purpose? (Exe)
built within the river Haddeo (exe tributary)
regulates flows and storage
what are the advantages of peatland? (Exe)
increases water storage: reducing floods
increases water quality: reduces sediment in rivers
increases carbon storage: absorbs co2 unless its dry
what is the water balance equation? (Exe)
Precipitation - Evaporation +/- water stored + runoff
how have people attempted to restore the peatlands? (Exe)
mires project = block the drainage ditches which were causing the land to dry out.
what % of the water balance is runoff? (Exe)
65%
what causes the high surface run off in the the Devon catchment? (Exe)
84.4% impermeable soil and highly saturated soil due to high rainfall
how large is the drainage basin? (Exe)
601km2
what is the elevation in the North and in the South? (Exe)
514m (N)
25m (S)
what is the % of impermeable Devonian sandstone? (Exe)
84.4%
