* Heavy rainfall: During heavy rainfall, stormwater can enter the sewer system and overwhelm it, causing the water level to rise and the pressure to increase.
* Blockages: Blockages in the sewer system, such as tree roots or grease, can restrict the flow of water and cause the pressure to build up.
* Gas leaks: Gas leaks can occur from nearby gas lines or from the decomposition of organic material in the sewer system. These gases can build up and create an explosive mixture.
When the pressure in the sewer system becomes too great, it can cause manhole covers to be blown off, releasing sewer water and gas into the air. This can create a dangerous situation, as the sewer water can contain harmful bacteria and the gas can be explosive.
In addition to the danger to people, exploding manholes can also cause extensive damage to property. The force of the explosion can blow out windows, doors, and walls, and can even collapse entire buildings.
If you see a manhole cover that is bubbling or making a hissing sound, it is important to move away from the area immediately and call the authorities. These are signs that the manhole is about to explode.
Preventing exploding manholes requires regular maintenance of the sewer system, including cleaning and inspecting manholes and pipes, and removing any blockages. It is also important to properly dispose of grease and other materials that can clog the sewer system.
