3. What is a Drainage Basin? It is the land area or catchment area drained by a single river and its tributaries. A imaginary line called the watershed separates one drainage basin from another. The watershed usually follows a ridge of high land. Any water falling on the other side of the ridge will flow through the adjacent drainage basin
4.
5. The balance between the input and output of a drainage basin may be shown as a WATER BUDGET GRAPH 1. When precipitation is higher than Evapotranspiration there will be a WATER SURPLUS 2. When Evapotranspiration exceeds precipitation there will be SOIL MOISTURE UTILISATION occurring, this leads to WATER DEFICIT 3. When the soil is recovering from deficit we term it SOIL MOISTURE RECHARGE 4. We then Consider over a whole year whether a place has a ………… positive or negative WATER BUDGET
6. Pupils to come up and explain what happens in each diagram. Imagine this was an exam question (GAS) Copy these down and add you own notes to explain what is occurring Where would field capacity be? Do we think that the UK and Greece have an overall positive or negative Water Budget?
7. One pupil to come and explain what is happening here- use as many key terms as possible
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