18. What is the impact of precipitation on drainage basin stores and transfers in a named river catchment? Flashcards
1
Q
Explain water balance in River Exe
A
Water balance: precipitation (1295mm) = evaporation +/- soil water storage (451mm) + runoff (844mm) - therefore around 65% of precipitation runs-off - this is quite high, due to:
2
Q
Why are rocks so good for overland flow?
A
Geology - over 80% is impermeable rocks e.g. Devonian sandstones
3
Q
Explain land use in Exe catchment
A
Land use - Almost 70% grassland, 15% woodland and farmland. 3% peat bogs
4
Q
How do drainage ditches impact peatlands?
A
Drainage ditches to drain peatlands reduce soil water storage
