It is not a rare situation that manholes are built instead of being constructed with concrete. This option should be chosen for more than one reason. One important reason is that manholes should be impenetrable. Other important reason for building it is the fact that a manhole should be able to withstand an earthquake or hydrostatic pressure. It is also possible that the wall between the two chambers can crack and the manhole could stop functioning (and the problem of a Blocked manhole Walthamstow can happen).
There are a few optional reasons why manholes can become full of waste in a short period of time (or shorter than it usually happens)and it can happen that you will need professional assistance in a case of Blocked manhole Walthamstow.
Sometimes it will happen that water streams under the ground will increase in volume (which often happens when snow is melting, when heavy rains are falling and in similar situations). In such situations, especially when they happen a lot, it is not wise to put roof drains to the manhole. In order to make sure those problems with these cases will not happen and overflow the manhole, it is good to make sure that waters from the surface will not flow into the manhole. If the manhole is located on a hillside, there is not much to do – you just have to put a pipe for drainage of waters from the manhole. It is also important to place gravel for the drainage surrounding the pipe for the drainage along the piping, following the hillside and for at least ten meters. If the manhole is located on grounds without inclination, all you have to do is make a pool that will collect excessive waters from the surface. It is good to make that collecting pool some ten meters from the manhole. Keep in mind that this collecting pool should be at least 1-2 meters deeper than the manhole. Put drainage gravel inside this collecting pool up to the half of its depth, placing the dirt over the gravel all the way to the surface. Put drainage piping from a manhole to the collecting pool. The piping can be classic plastic pipes that have perforation so that it can let go of water.
The channel from the manhole to the collecting pool should be approximately one meter deep and approximately two dozen centimeters in width. Put pipes for draining into the channel and then cover it halfway with the gravel and other half with the dirt.