For sewers, inverted siphon is provided for A. One pipe B. Two pipes C. Three pipes D. Four pipes

Inverted siphons are used in a variety of applications, including:

• To carry wastewater under roads or railways
• To carry wastewater under rivers or streams
• To carry wastewater from one area to another

Inverted siphons are a safe and effective way to carry wastewater. They are designed to withstand the forces of gravity and water pressure. They are also designed to prevent the build-up of sediment and debris.

Here is a brief explanation of each option:

• Option A: One pipe. This is not a correct answer because an inverted siphon requires two pipes.
• Option B: Two pipes. This is the correct answer because an inverted siphon requires two pipes.
• Option C: Three pipes. This is not a correct answer because an inverted siphon requires two pipes.
• Option D: Four pipes. This is not a correct answer because an inverted siphon requires two pipes.