Category: Design
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
A manhole is a concrete, block or precast chamber placed on the drainage network at junctions, changes of direction or gradient, and on long runs, with a cover rated for the load above and a benched channel at the base to guide the flow.
Why it matters on a project
Without it, a blockage can only be cleared by breaking out. A light cover in a driveway breaks within months.
Measurement and pricing
By number according to depth and size, stating cover type and load class.
Common mistake
Leaving the chamber base flat with no channel, so solids settle and blockages repeat.
Frequently asked questions
Where do manholes go in a villa?
Where drains leave the building, at junctions and bends, and before the public sewer or septic tank.
Which cover suits a driveway?
A cast iron cover rated for vehicle loads, not a pedestrian cover.
Related terms
- Septic tankA pit or tank collecting wastewater where there is no sewer.
- MEP drawingsElectrical, plumbing, HVAC and fire drawings.
- ExcavationRemoving soil down to the required foundation level.
- Site planA drawing showing the building within the plot with setbacks, entrances and levels.
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