What is the formula for calculating drainage density?

Drainage density is calculated using the formula:

[ \text{Drainage Density} = \frac{L}{A} ]

where ( L ) is the total length of all the streams and rivers in a given area, and ( A ) is the area of that region. This metric helps assess the density of a river network relative to the size of the land area, providing insights into hydrological characteristics and landscape erosion processes.