AP Environmental Science / Unit 5: Land and Water Use
5.5 Irrigation Methods
Notes
| Method | Efficiency |
|---|---|
| furrow | ~65% |
| flood | ~80% |
| spray | ~75–95% |
| drip | over 95% |
- Problems: waterlogging and salinization (salts left as water evaporates).
- Agriculture uses about 70% of global fresh water.
Practice
The most efficient irrigation method:
Water goes straight to roots.
Salinization happens when:
Salt builds up.
Most human freshwater use is for:
About 70%.
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