Question Bank • QB_EXP_SWCE_WSH_005 NAT • 1 Mark

Section 4: Soil and Water Conservation Engineering

Watershed Management & Rainwater Harvesting

Subtopic: Drainage density calculation

Question Statement:

A watershed having a total drainage basin area of $A = 30\text{ km}^2$ has a cumulative stream channel length of all orders equal to $\sum L = 70\text{ km}$. The drainage density $D_d$ of the watershed is ________ $\text{km}^{-1}$ (round off to two decimal places).

Answer Key:

2.33

Step-by-Step Solution & Explanation

Drainage density $D_d$ is the total length of streams of all orders per unit basin area: $D_d = \frac{\sum L}{A} = \frac{70\text{ km}}{30\text{ km}^2} = 2.33\text{ km}^{-1}$
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