The runoff may be indirectly estimated by 1. empirical formulae relating rainfall and runoff 2. infiltration method 3. rational method and 4. unit hydrograph method
- A1 and 2
- B2 and 3
- C3 and 4
- D1, 2, 3 and 4Correct
Solution
Concept
Runoff estimation methods
Step-by-step solution
1. Empirical formulae, infiltration, rational method and unit hydrograph are all used.
Explanation
All four are indirect methods.
Why the other options are wrong
Others are incomplete.
Shortcut
All of the above.
Correct answer: D) 1, 2, 3 and 4