Drainage Basin
A drainage basin is an artificial basin designed to hold stormwater runoff for a limited period of a time.
A drainage basin is usually constructed when the cost of installing underground stormwater drainage with enough capacity to handle peak flows is prohibitive and no overland flow path is available.
Depending on the situation, the collected stormwater is either:
- drained after the storm event through a lower capacity gravity pipeline;
- pumped via a pressure pipeline to a higher point in the Drainage Network;
- left to evaporate away;
- injected into the underlying aquifer
Types of Drainage Basins
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