Drainage is the outflow of water through the system of natural rivers
The following are hints to follow when you describe drainage in topographical map
- Divide the map into drainage basins using compass directions. Note that the drainage basin is an area drained by single river system.
- In each drainage basin explain the drainage pattern which the river system in the basin take. The common river drainage pattern are
-Dendritic drainage pattern
-Radial drainage pattern
Trellised drainage pattern
-Centripetal drainage pattern
- For each drainage basin explain how the rivers drain the relief region i.e highlands, lowlands and plateaus. at this part state the direction of the flow of the river, where the river is pouring its water and whether the area is well drained or not. The area is well drained when there is no swamps or marshlands and is not well drained when is waterlogged areas.