How to unblock a manhole
There are different models of manholes. The three-chamber manhole is a circulating manhole constructed of watertight material from which cleaned water is going into the ground. It is significantly smaller than classic collecting manholes. For example, a three-chamber manhole for 5 users has 1500 l volume, while a classic manhole for 5 users has 18 000-20 000 l volume. A …