Inspection cover issue

[John Benson]

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 

 

[ToughButterCup]

• 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

[John Benson]

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.

 

 

[crooksey]

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. 

[John Benson]

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. 

[crooksey]

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:

 

 

[John Benson]

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. 

[crooksey]

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.

[John Benson]

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. 

[crooksey]

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/.

 

 

 

[John Benson]

Thanks for all your help Crooksey, I’ll do that. 
 

best

 

john