Allied & ICAR Exam Bank • ALLIED_1161 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Watershed Morphometry

Subtopic: Drainage Density

Question Statement:

A watershed of area $A = 25\text{ km}^2$ has a total length of stream channels (of all orders) $\sum L = 60\text{ km}$. The drainage density $D_d$ of the watershed in km/km$^2$ is:

Answer Key:

2.4

Step-by-Step Solution & Explanation

Drainage density $D_d = \frac{\sum L}{A} = \frac{60\text{ km}}{25\text{ km}^2} = 2.4\text{ km/km}^2$.
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