Hoping for some advice. Neighbour is running a foul (I believe) drain through our garden. What depth should it be sunk to to meet regs?
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Water Drain Depth
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Posted 14 hours ago #
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Personally i would want it as deep as possible, within reason, obviously they have to be able make the connection downstream.
Foul pipes should be laid at min 1:80 graidient if it has at least 1 toilet connected and min 100mm dia, 1:40 if no toilet connected, 150mm pipe can be laid slacker if more toilets connected, but not really recommended.
Depth shoul be min 600mm cover to soffit (top of pipe) if located in landscaped areas. Min 900mm to soffit in drives, min 1200mm to soffit in highways.
There is a bit of give and take if the pipe is surrounded with concrete but those depths should see you right.Posted 13 hours ago # -
I don't think there is an official minimum. Just needs to be unlikely to get damaged so can be pretty shallow if in concrete. Electrics and water are usually 600mm to be protected from damage so that's probably a reasonable figure across a garden. Also as soon as it crosses a boundary it's technically a public sewer and the water company like to be involved.
Posted 13 hours ago # -
Ok so 290mm is probably cutting it a bit fine :/
Posted 13 hours ago # -
Just deep enough so you can still hit it whilst digging the borders!!
Is that full depth or cover?
I wouldn't let them lay that pipe in my garden, especially if it's any where near where someone may want to put an extension or shed/ out house one day.
Posted 13 hours ago # -
We’ve a strange layout but in effect it’s a border running along the side of their house. There is no risk to anything being built, only thing is us gardening. They’ve already ruined our garden doing it as they’ve taken all plants out of the border and just yesterday chopped half the roots from the 35yr old magnolia as they’ve decided to change the route of the pipe. Fingers crossed it survives as it’s the only one we wanted leaving untouched.
290mm is to top of pipe from ground level.
Posted 13 hours ago # -
Why have you let them ruin your garden?
Posted 5 hours ago # -
Foul pipes should be laid at min 1:80 graidient if it has at least 1 toilet connected and min 100mm dia, 1:40 if no toilet connected, 150mm pipe can be laid slacker if more toilets connected, but not really recommended.
Depth shoul be min 600mm cover to soffit (top of pipe) if located in landscaped areas. Min 900mm to soffit in drives, min 1200mm to soffit in highways.
There is a bit of give and take if the pipe is surrounded with concrete but those depths should see you right.No offence but quite a bit of that is incorrect and hugely impractical.
Not ideal at all but at that depth i'd want it capping with 75mm min of concrete. That would protect it from being struck from above whilst still allowing it to be backfilled with soil. As for running tight past a tree that is just asking for trouble especially as thyre greatly reduced the trees stability. Do they have some kind of easement to come across your land?
Posted 5 hours ago # -
Do they have permission to connect into the public sewer. I used to work in the water industry and the arrangement you describe is fraught with issues. Why are they routing through your property?
Posted 4 hours ago # -
wrightyson you’ve reminded me of something that was passed on when we bought the house regarding easement, I’m going to dig out the plans tonight and take a look. The houses were built in 1675 and I remember some strange agreements from the documents we received. What’s the best photo sharing site as I’ll get some pictures up.
As to why we let them ruin our garden, thought we were being good neighbours as they are renovating their house (just like us). The work being done at winter has meant a lot of issues but I’ll share some photos later when I’m in from work.
Posted 4 hours ago # -
Is this a new drain or repair of existing? Do they have an existing easement or covenant in their/your deeds? If not how much are you charging them?
Posted 4 hours ago # -
There is no risk to anything being built
but you;re giving up that right in perpetuity and also effectively giving any future owner access to dig the pipe up again.
As above, are they paying and have you had it looked at legally?
Do mortgage companies worry about this sort of thing?
Posted 3 hours ago # -
That will become a shared drain as its from his property and is running across someone elses property even though the other person isn't connecting into it at that point.
The local water authority will be responsible for the future maintenance of it.
There is paperwork to do as you might imagine!
Posted 3 hours ago # -
No offence but quite a bit of that is incorrect and hugely impractical.
It may be impracticable to domestic builders, but it's what civil engineers design to, so it's not incorrect it's all in building regs and sewers for adoption.
Posted 3 hours ago # -
I must let my engineers know the next time we put up a domestic 160000 sq ft shed
Posted 2 hours ago # -
If we're playing construction scheme top trumps, i'm just designing the drainage and highways for a 174 plot housing estate.
Pics are rubbish but it's all there.[img]
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Posted 2 hours ago # -
I must let my engineers know the next time we put up a domestic 160000 sq ft shed
If they don't know that most of what ads678 is right, then maybe you should...
Posted 2 hours ago # -
If it was a new build, Sewers for Adoption (7th) for a public lateral drain states:
0.35m cover to domestic gardens without vehicular access
0.5m domestic driveways, parking areas (7.5 tonnes GVW limit)
0.9m domestic driveways, parking areas, narrow streets without footways (>7.5 GVW)
1.2m other highways.I'd be more concerned about legal and liability issues than practicalities though.
Posted 2 hours ago # -
As for in the highway spec, yup all for that, however I'd wager not all connections in to housing are done at those depths. 900mm is not required in domestic driveways, and if we're really nit picking the soffit is not the top of a pipe.
However..... i did think min fall on 100mm was 1/100 on foul and I'm sure that weve put pipes in to that, am I right in thinking 1/150 on 150mm with 4 toilets +Posted 2 hours ago # -
5 toilets for 150 @ 1:150. Building regs will generally allow pipes of 150mm dia and above to be laid at a gradient of no less than the dia. I will always try to design to the hydraulic tables in order to achieve self cleansing velocity though. But we all know that 100mm @ 1:100 will usually work though. just don't eat too much steak!
Obviously I know as a civil engineer everything we do is generally over designed but if we don't we get problems, cos stuff gets pushed too far the other way.
and if we're really nit picking the soffit is not the top of a pipe.
I know this, but this is a bike forum so I doubt the OP cares!!
Posted 2 hours ago # -
That 4mm on a plastic pipe could make all the difference to his planting options
Posted 2 hours ago # -
Interesting thread. The plans for our house show a sewer running at the border at the back, as there is a row of 30-40m tall ash trees very close to this I assumed that the drain was unused but then the neighbour found a drain cover to it under his patio (makes a changes from find wives under them) and then last week I uncovered a drain cover for a drain from our house going presumably to the sewer. This also has trees growing directly above it.
I hope the drain / sewer is deep enough!Edit
from Severn Trent website:
The following trees and those of similar size, be they deciduous or evergreen, should
not be planted within 6 metres of a sewer, water main or other STW apparatus. E.g.
Ash, Beech, Birch, most Conifers, Elm, Horse Chestnut, Lime, Oak, Sycamore, Apple
and Pear.
Oh dear, there is also leylandii, apple and pear trees above the sewer as well as the Ash trees.Posted 1 hour ago # -
You need to put a sketch on the thread, I'd be concerned that it's being bodged with a possible illegal connection to the sewer as well as all the liability issues arising
Posted 16 minutes ago #
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