My estate has a problem with flooding. The problem is with the inabilityof the surface water drains to cope with prolonged rainfall. The system backs and water rises up through the drains. As many properties are sited lower than the road level the excess water then runs into the adjacent properties subsequently flooding them by as much as two feet in depth. My question relates to the effectiveness of non-return valves located in the drainage pipework which several of my neighbours are considering installing. Do they work effectively and how much do they typically cost to install.
Logically that won't solve the problem. If you install NR valves in the private part of your drainage system then all that will happen is that it will come out of the drains in the road when it backs up to that level. From there where will it go? Down the hill to the house again! So nugatory expenditure. If the flooding is as bad as you say that suggests there is a problem with the public sewers. If enough of you nag your local water authority they'll have to do something. You could also suggest to the environmental health people at the council that there is the possibility of a threat to public health.
Answering your question yes there are valves that totally close off the sewer. However, to be effective you need to install a holding tank to contain the waste that you create while the drain is closed.
And you can DIY.
May I suggest that before the estate was built the rain got away to a nearby stream or river and perhaps the best thing to do is, study the lay on the land and work out where the surface water would go, if various fences, walls, buildings had not been placed in its path.
Perhaps you, or one of your neighbors has on old map with contours and rivers on it, or better still a modern map on their computer that will provide the ground height above sea level for every garden - then you can see what needs to be done to loose the surface water.
Possibly a hole through someones fence or wall may provide the answer.
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