1. Higher Geography:
Drainage basins

2. evaporation and transpiration precipitation
Interception
(stored in plants)
overland flow
Surface storage
infiltration
throughflow
channel storage
soil water storage
percolation
streamflow
groundwater flow
groundwater storage
Or ‘channel runoff’

3. Watershed - the boundary separating one drainage basin from another.
Tyne drainage basin
or catchment area

4. Constructing a watershed

5. The watershed defines the boundary of the catchment area.
Drainage Basin 1

6. Drainage basins interlock…1 2
Drainage
Basin 3

7. transpiration
infiltration
channel runoff
overland flow
precipitation
evaporation
Water table

8. The Tay-Earn basin Lunan drainage basin River Earn drainage basin
Firth of Tay
The Tay-Earn basin
River Tay and River Earn catchments, Perthshire, Scotland

9. The Tay-Earn basin Lunan Burn gauging station Firth of Tay
River Tay and River Earn catchments, Perthshire, Scotland

10. Things to think about! River Tay video What a drainage basin is like.
The changing landscape from source to mouth.
Why what a river does is important to us.
The impact of flood events on human activity.