The aim of the research was to determine the rain water volume which infiltratesthrough the holes in the sewage chambers inside the pipes of the separatesewer system. Incorrect paving or the sewer chambers envois cause the chambers'surfaces deepen in the area surface. The water which flows down during the rainfallor the snow melt, infiltrates inside the chamber through the cleavages, butmainly through the technical holes in the hatches. These holes are used for the keyor the lever to raise or to open the lid of the hatch.The field analyses showed that many sewage chambers are made incorrectly.In many cases the hatch's lid is located from 10,6 to 38,3 mm below thearea surface. It causes the rainfall or the snowmelt water to overflow through thecleavages or through the holes in the hatch to the sewage chamber. On the basisof the laboratory analyses, it was ascertained that the inflow of the precipitationwater to the sewage chamber, by the hole used to raise the lid, can be described bythe following equation: Q = 25 · h2 + 7,7679 · h, in which h is the immersion of thehatch below the area surface.The research showed that with the long-term rainfalls or the surface flowsrelated ...
