The surface drainage density is normally affected by the rock type, this influences the permeability and the percolation rate of rainfall in specific areas. Drainage network of the watershed helps in visualizing which areas has a high groundwater recharge. Drainage density is directly related to slope and inversely proportional to permeability. The steeper the slope with low permeability, the higher the drainage density, thus less infiltration and more surface runoff. Drainage density is an important factor considered to depict the groundwater occurrence.
