| Name |
Pattern |
Description |
| Annular |
 |
A ring-shaped drainage system. Over circular underground rock structures such as batholiths, the drainage network may develop into a series of concentric rings. |
| Dendritic |
 |
A branching, treelike drainage pattern. In areas of uniform rock, with little distortion by folding or faulting, the rivers develop a random branching network similar to a tree. |
| Trellised |
 |
A rectangular drainage pattern. It occurs when the rock structure steers streams into a parallel course, with tributaries joining at almost right angles. Sometimes, the joint pattern in the rocks creates a Rectangular drainage. This is similar to the Trellised drainage, but the pattern is less distinct. |
| Parallel |
 |
Terrain structure causes rivers to flow in virtually parallel course, perhaps by parallel folds. |
| Radial |
 |
A spoke-like pattern of rivers. These tend to flow away from the summit of a dome or volcano in all directions. |
| Deranged |
 |
An irregular broken drainage system. When ice sheets melt, the drainage pattern left behind may be broken and irregular. Rivers have not had time to adapt to the underlying rock structure, and follow the irregularities of glacial deposits. |
