A drainage system is the pattern formed by the streams, rivers, and lakes in a particular watershed. They are governed by the topography of the land, whether a particular region is dominated by hard or soft rocks, and the gradient of the land.

Types of Systems

• dendritic - gentle slopes
• parallel - steep slopes
• trellis - rivers between ridges of hard rock
• radial - central mountain or dome
• rectangular - faulting
• annular - circular ridges from a basin
• deranged - chaotic