John Benson Posted October 13 Share Posted October 13 Hi All, id very much appreciate if anyone had done ideas on the following. I have an internal inspection cover in my kitchen. It’s screwed down tight and there are no issues with odours etc. However, I noticed during a particularly period heavy of rain last year ( I think the drainage system around my area was overwhelmed by the intensity of the rain and the volume of surface water entering the system) there was some water in the kitchen. I suspect it may. have come from the cover. The amount of water was minimal, probably no more than a cupful or two, but given the nature of the water, it’s better avoided if possible. I was hoping you might be able to suggest an inexpensive solution. thank you all. I look forward to chatting and hopefully helping too where I can. Best john Link to comment Share on other sites More sharing options...
ToughButterCup Posted October 13 Share Posted October 13 (edited) Lift. Inspect Clean Jet through. Reseal Wait Pray When your prayers are not answered , post on BH for the Drain God to reply. Meantime Pass Go, Collect £200 and send that to my account (PM sent 😜) Edited October 13 by ToughButterCup Link to comment Share on other sites More sharing options...
John Benson Posted October 13 Author Share Posted October 13 Thanks for your reply tough buttercup. Although it’s not blocked. It’s more of a sealing issue. It only happens when there is a storm surge. No problem with odours etc. I was wondering whether to reseal with manhole grease etc or something cheaper. Link to comment Share on other sites More sharing options...
crooksey Posted October 14 Share Posted October 14 Adding a non return valve on your drainage run before it joins the surface water (if combined sewer) will stop storm surges causing a problem on your foul runs. You need to clean and maintain them regularly. Link to comment Share on other sites More sharing options...
John Benson Posted October 14 Author Share Posted October 14 Thanks so much Crooksey for replying. The drains are not shared. I think it’s a case of surface water being illegally drained Into drain sewer on the street. Do you think sealing the drain with manhole grease will help? Like I said, it’s only a couple of cupfuls of water that escapes through the inspection cover in kitchen. It’s quite well sealed, no odours. thanks again. Link to comment Share on other sites More sharing options...
crooksey Posted October 15 Share Posted October 15 In theory, there should be no reason why effluent or water comes back through a manhole cover, unless the downstream runs are blocked. To answer your question, manhole grease should help yes. But I can assure you, if water is getting up through a manhole cover, then more foul air than you realise is as well. Something like this on your last manhole before the road could help: https://pipetek.co.uk/products/retrofit-non-return-valve?variant=31966322917494 This below video shows how NRV's can protect in storm surges: Link to comment Share on other sites More sharing options...
John Benson Posted October 15 Author Share Posted October 15 Thanks Crooksey. This is really helpful. Nothing like this had occurred to me. If you don’t mind , could you take a look at picture below. Do you think the internal inspection drain in the kitchen would be the place to is install something like this? This is the cover closest to the deep manhole cover on the drive. Thanks again for taking the time to reply to this. Link to comment Share on other sites More sharing options...
crooksey Posted October 16 Share Posted October 16 It won't work on the IC in the kitchen, probably flows from there to the one on the drive (easy to test). It would need to be on the last IC before the property, so it does't allow backflow. Link to comment Share on other sites More sharing options...
John Benson Posted October 16 Author Share Posted October 16 Hi Crooksey, thanks for getting back to me again. The neighbour and I use to be one property. Their loo etc flows to inspection cover outside my back door, which then journeys down to the inspection cover in kitchen and then down to street/drive. The manhole on drive is super deep. My question is why would the IC in the kitchen not work? If the non return valve is there. wouldn’t the water would just back up to drive manhole? It’s really deep. From one inspection I had done I could see The outflow pipe in manhole is set right at the bottom of manhole which is why it gets overwhelmed when flood water from street drains into it. I’m probably being really slow here, but I can’t see how you’d install a return valve there. Again, thanks again for replying. Link to comment Share on other sites More sharing options...
crooksey Posted October 17 Share Posted October 17 because if you add the NRV in that manhole in the house, it would only work up to the "back" edge of the inspection chamber, water that entered the mahole next to the road would still back fill into the IC in your kitchen. If you fitted the NRV i posted into the IC in the kitchen it would be the wrong way round, and effectively block that IC from passing effluent into the manhole in the road. If you are not confident doing it, I am sure a local drainage company would be able to assist. It cold also be that the manhole in the driveway needs replacing with an "air tight" one, this will ensure no flood water enters it. It may be worth getting a CCTV survey just to check there is nothing un-toward. I see you are in Surrey, I am not affiliated with them, but I use "Totally Blocked" for all my CCTV surveys and any patch repairs that need doing. https://www.totallyblockeddrains.co.uk/. Link to comment Share on other sites More sharing options...
John Benson Posted October 17 Author Share Posted October 17 Thanks for all your help Crooksey, I’ll do that. best john Link to comment Share on other sites More sharing options...
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