Turns out our new place has a septic tank. Was trying to work out if the roof gutters went into a soakaway and found some plans on the councils site which showed a septic tank in the woods next to the house and sure enough there is a manhole with an air vent right inline with where the arrow on the plans pointed.
A little bit off further away and not inline there is another manhole, would this also be something do do with the septic tank, a second stage or maybe a separate one for the rain water as the soil type is clay so wondering if they have gone for a tank instead of a soakaway on that side of the house.
My reason for exploring is I am trying to work out a way to get my washine machine waste into the septic tank from the utility (dishwasher won the battle for the only space in the kitchen). Only ways to do it so far are:
1. Pipe round to outside kitchen drain - would end up with water stuck in the pipe as it would need to be low under the door and then pop back up into the drain.
2. Tank outside of utility with a dirty water pump to pump over the utility roof and into the kitchen drain - tank I have, pump I don't.
3. Tap into the guttering down pipe next to the utility but I think this is a soakaway so a no go (although it does seem to head towards the second manhole)
4. Tap into the underground waste pipe (passes right by the washing machine) but this sounds fraught with danger of messing up.
5. Run a shallow waste pipe into the woods (6m or so) and pop the end into the vent on the septic tank which is quite big and has a couple of broken grills so a pipe would go in - is there some kind of baffle/trap that would prevent this?