Hello,
I'm wondering if anyone on here can recommend anyone in Suffolk (my site is near Bury St. Edmunds) who could take a look at the potential sewage setup for my house. My issue is this:
When I bought the site, I was told there is a mains sewer in the road, about 30m from the property (it's a barn conversion). But it turns out this is a rising main, therefore pressurised and impossible to tap into. Anglian Water does not seem to be prepared to send someone out to look at the area/site and give advice.
(Uneducated assumptions and a fair amount of amateur guesswork ahead! Forgive my lack of sewagey knowledge...)
So the next nearest mains option would entail a ~90m run, into a manhole whose 'depth to invert' is 1.55m. The site is very flat. If I used 150mm pipe, I'm assuming I could get away with a 1:80 fall (1.125m fall over 90m), but it'd mean I'd be discharging very low down in the manhole, which I presume would risk the foul water flowing through the manhole backing up my sewage pipe. Is that correct? If that is correct, I assume my solution would be one of these expensive-sounding options:
Install a pump between my property so it can flow happily to the manhole, with all the installation, running and maintenance costs that this would create.
Install a septic tank and drainage field: I have read guides on how to calculate how large a drainage field needs to be (depending on the soil's percolation value and how many people will be using the house) but without knowing the percolation value, I can't even make a guess. If we assume the percolation value is fairly average (the soil is not clay, it's quite nice), could anyone here give me an idea on what the drainage field size is likely to be for a 4-bed, 3-toilet house?
Install a sewage treatment plant: Presumably the only reason I'd need to do this is if I don't have sufficient space for a drainage field for a septic tank? (I'm also assuming that Building Control can't arbitrarily insist on this instead of a septic tank...). Obviously this would have higher installation, running and maintenance costs than a simple septic tank.
So if anyone can give me some advice or knows someone/a company who would be interested in looking at this/doing the work, then please let me know!
Thanks in advance for any help.
- Paul