Question

Explain the influence of vegetation on drainage density ??

Answer 1

According to Nag (1998), low drainage density is generally characteristic of areas of highly resistant or permeable subsoil material, dense vegetation and low relief. Drainage density of a basin also affects its hydrologic response to rainfall events, and thus the shape of its stream's hydrograph during a rain storm.

Factors affecting drainage density include geology and density of vegetation. The vegetation density influenced drainage density by binding the surface layer, thus preventing overland flow from concentrating along definite lines and from eroding small rills which might become small channels.