Select the parameter(s) required for determining peak rates of runoff using the Rational formula.
Show Hint
- Intensity of rainfall
- Coefficient of runoff
- Velocity of flow
- Hydraulic mean depth of flow
The Correct Option is A, B
Solution and Explanation
Step 1: Recall the Rational formula.
The Rational formula for peak runoff is given as:
\[
Q = C \cdot I \cdot A
\]
where,
- \(Q\) = Peak runoff rate (m\(^3\)/s)
- \(C\) = Runoff coefficient (dimensionless)
- \(I\) = Rainfall intensity (mm/hr)
- \(A\) = Catchment area (ha or km\(^2\))
Step 2: Check parameters.
- (A) Intensity of rainfall → Directly part of formula. ✓
- (B) Coefficient of runoff → Accounts for surface permeability and land use. ✓
- (C) Velocity of flow → Not used in Rational formula, relevant to hydraulic design, not peak runoff. ✗
- (D) Hydraulic mean depth of flow → Related to open channel hydraulics, not Rational formula. ✗
Step 3: Conclusion.
Hence, only (A) and (B) are required.
Final Answer: \[ \boxed{\text{(A) and (B)}} \]
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