The drainage density of a river basin is calculated using the formula $\frac{L}{A}$, where $L$ is the total length of all streams in the basin and $A$ is the basin area. If a basin has an area of 1500 km² and the total length of all its streams is 300 km, what is its drainage density?

Step-by-step solution

1. Write the formula: Drainage density $D=\frac{L}{A}$.
2. Substitute the given values: $D=\frac{300\text{ km}}{1500{\text{ km}}^2}$.
3. Divide 300 by 1500: $D=0.2$ km/km².
4. Thus the drainage density is 0.2 km/km².

Concept tested: Drainage density calculation

Published 10 October 2026 · How this solution was prepared and checked