The base is made of concrete or reinforced concrete of class C35/45. Depending on the diameter of the manhole, connections are used from Ø 32 to Ø 1200.The technology provides for the possibility of making inlets at angles of 45° to 315° along the perimeter in relation to the outlet. Sealed wells in combined sewer, stormwater and industrial drainage systems for the disposal of rainwater by gravity or low pressure. The allowable foundation depth of manholes should be determined by the network designer. Typically, manholes are founded to a depth of 7 m below ground level. Manholes can be installed in any soil in vehicular and pedestrian traffic areas in roadways and car parks, as well as outside buildings. The concrete and reinforced concrete elements of prefabricated sanitary manholes can be used in a weakly aggressive chemical environment without additional corrosion protection.