Question:
Which of the following geo-morphological parameters is not used for quantitative expression of basin shape?
Which of the following geo-morphological parameters is not used for quantitative expression of basin shape?
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Shape indices include Form Factor, Elongation Ratio, and Circulatory Ratio. Drainage Density belongs to drainage network characteristics, not basin geometry.
Updated On: Aug 24, 2026
- Form factor
- Drainage density
- Circulatory ratio
- Elongation ratio
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Basin shape is described using dimensionless geomorphological indices that compare basin area, perimeter, and length. These parameters help estimate runoff characteristics and flood response.
Step 2: Detailed Explanation:
Consider each parameter:
Form Factor: Measures the compactness of a basin and directly represents basin shape.
Circulatory Ratio: Indicates how closely a basin resembles a circle and is also a basin shape index.
Elongation Ratio: Describes whether the basin is elongated or circular.
Drainage Density: Represents the total length of stream channels per unit basin area. It describes the drainage network, not the geometric shape of the basin.
Therefore, drainage density is excluded from quantitative basin shape parameters.
Step 3: Final Answer:
The correct answer is (B) Drainage density.
Basin shape is described using dimensionless geomorphological indices that compare basin area, perimeter, and length. These parameters help estimate runoff characteristics and flood response.
Step 2: Detailed Explanation:
Consider each parameter:
Form Factor: Measures the compactness of a basin and directly represents basin shape.
Circulatory Ratio: Indicates how closely a basin resembles a circle and is also a basin shape index.
Elongation Ratio: Describes whether the basin is elongated or circular.
Drainage Density: Represents the total length of stream channels per unit basin area. It describes the drainage network, not the geometric shape of the basin.
Therefore, drainage density is excluded from quantitative basin shape parameters.
Step 3: Final Answer:
The correct answer is (B) Drainage density.
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