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Write a short note on drop manholes with sketches
written 6.2 years ago by gravatar for teamques10 teamques10 ★ 67k •   modified 4.5 years ago
environmental engineering
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written 6.2 years ago by gravatar for teamques10 teamques10 ★ 67k •   modified 6.2 years ago

diagram

  • The manhole in which a vertical pipe is used is called a drop manhole , where as the one using an inclined pipe is called a ramp.

  • The construction of a drop manhole in place of an ordinary manhole in case a high level branch sewer enters a low levelled main sewer, will thus given serve the following purposes:

  1. The steep gradients which otherwise would have to be given to the branch sewer will be avoided.

  2. The sewage trickling into the manhole from the directly placed branch sewer is likely to fall on persons working in the manhole. This is avoided in drop manhole.

  • The branch sewer is joined to manhole through a vertical pipe. The sewage coking through the branch sewer dips in through the vertical pipe, and trickles over the main sewer channel , just above it.

  • A plug is provided at the point where branch sewer, if taken straight intersects the wall of the manhole.

  • The length of the branch sewer between the vertical pipe and the plug is known as inspection arm
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