A bridge has a linear waterway of 150 m constructed across a stream whose natural linear waterway is 250 meters. The average flood depth is 2.5 meters and the average flood discharge is 1500 m³ per second. Estimate the velocity of approach.
- A2.0 m/sec
- B2.2 m/sec
- C2.4 m/secCorrect
- D2.6 m/sec
Solution
Concept
Natural velocity
Formula
V = Q/A
Step-by-step solution
1. A = 250 × 2.5 = 625 m². 2. V = 1500/625 = 2.4 m/s.
Explanation
Natural stream area.
Why the other options are wrong
Others do not follow.
Shortcut
Q/A.
Correct answer: C) 2.4 m/sec