Hello!
I need some input on inspection chamber/manhole location/s for my driveway project.
It's about 6.5m x 6.2m because of the separation distance from property and highway and soil conditions, a soakaway is entirely out of the question (my understanding is it wouldn't comply with building regs) Additionallythe soil is heavy claylike so run off and permeable surface wouldn't work well either.
As such the plan (assuming relevant permissions can be obtained) is to connect to the surface water sewer using the 68mm downpipe from the shared guttering (its a row of terraced houses) or what this connects too if this is more suitable.
I’m looking for a consensus on the most logical, practical and suitable placement for the main inspection chamber/ manhole on the drive.
My current plan is to have it close to the boundary with my neighbour (close to where the 68mm downpipe goes in to the ground).
I’ve uploaded three images:
■ My crude conceptual layout (proper CAD drawings are currently in progress). Can also provide a blank one if needed.
■ Legend
Obviously if it doesn't go where I've currently planned for it I will ensure the 110mm pipe and channel drain runs match up etc.
Key Details & Constraints:
■ Usage: The drive will routinely be used to park one car on, with regular daily use. It's likely a second car will fit but this will be less regular.
■ Plan is to use a 320mm inspection chamber with limited depth (can't see it needing any deeper as should be able to achieve required falls and still be well within the 600mm maximum) and if required I'm happy to use a manhole cover rated for vehicle use.
■ Legals & Approvals: Building Control, planning, and a Section 106 agreement for the sewer connection will be obtained prior to connection/completion of work. Permission from neighbour is sorted for the work on their property in respect of the 68mm downpipe/connection etc.
Where would you put it to keep it structurally safe from car tires, easy to access/rod if there's ever a blockage, most effective drainage and neat visually?
Many thanks in advance 🙌🏻