The incorrect statement about inverted siphon is :
- AIt is constructed higher than adjacent sewer sectionCorrect
- BIt runs under gravity
- CThe pressure inside is greater than atmosphere
- DSewer pipe is dropped below the hydraulic gradient line
Solution
Concept
Inverted siphon
Step-by-step solution
1. An inverted siphon is a sewer section dropped below the hydraulic gradient line to cross an obstruction. 2. It runs full under pressure but flows by gravity. 3. It is constructed lower, not higher, than the adjacent sections.
Explanation
Statement A is false.
Why the other options are wrong
B, C and D are correct.
Shortcut
Inverted siphon dips down.
Correct answer: A) It is constructed higher than adjacent sewer section