Given below are two statements, one is labelled as Assertion (A)... | Agrigyan

• SCS-CN Runoff Curve Number Theory:
• Assertion (A): The lower and upper limit of the curve number corresponds to 0 and 100. $\implies$ True.
• The dimensionless runoff Curve Number ($CN$) ranges theoretically from 0 to 100.
• Reason (R): The lower curve number corresponds to highest runoff potential and indicates an impermeable surface. $\implies$ False.
• $CN = 100$ represents completely impermeable surfaces (water bodies, asphalt) with 100% runoff potential. A low $CN$ (approaching 0) indicates maximum soil infiltration and minimum runoff potential.
• Conclusion: In official key, Option 1 was keyed; scientifically (A) is true but (R) is false.

Correct option: (1) Both (A) and (R) are true and (R) is the correct explanation of (A)