River Catchment Area case study: River Chelmer Flashcards
where is the river chelmer?
in Chelmsfor, mid-Essex
what does the John Walker map of 1591 show?
Chelmsford as a small coaching village, surrounded by farmland
what size is the River Chelmers catchment area?
190 km
what is the catchment area made of?
semi permeable glacial drift
how much have rainfall rates falllen by since the 70’s?
16 ml
what is Chelmsfords population?
172,000
what has increased water extraction done to the water table?
reduced it by 1m
what is the summer base flow as low as?
0.15 cumecs
what kind of farming requires large amounts of water?
intensive farming
agribusiness
rapeseed
how many hectares of garden have been turned into driveways in the last 10 years?
100
by what percentage has woodland declined?
2%
what has climate change done to storm events?
increased their powerfulness and frequency
