Slides in this set
The Drainage Basin
· The drainage basin is the catchment area from which a river system
obtains it water.
· An imaginary line called the watershed delimits one drainage basin
from another the watershed generally follows a ridge of high land;
any rain falling on the other side of the ridge will eventually flow into
another river in the adjacent drainage basin.
· The drainage basin hydrological cycle is an open system with inputs
The drainage basin hydrological cycle can be studied using a systems
Inputs into the drainage basin include;
· Energy from the sun for evaporation
· Precipitation…read more
Outputs move moisture out of the drainage basin and include;
- Evaporation and transpiration from plants collectively called
- Runoff into the sea.
- Water percolating deep into underground stores where it can be
effectively lost from the system.…read more
Interception Storage Unimpeded
Flow Diagram of Drainage Basin Hydrology…read more
Within the drainage basin, the balance between inputs and outputs is
known as the water balance or budget.
· Rivers are present on the surface only if the stores are capable of
releasing water and if there is direct surface runoff.
· This is a dynamic relationship; river levels rise and fall over the short
term following heaving rainfall and often show an annual pattern
(called the river's regime) in terms of their discharge.…read more