Intense, prolonged rainfall combined with low capacity and stuffy storm-water drainage system may be the cause of severe economic losses as a result of the presence of inundation, flooding of urban areas, or washout the surface of the ground. There are also failures on wastewater treatment plant. Flash runoff from urban area can cause damage of wastewater treatment plant components, hydraulic overload and affect on the process of biological treatment by changing the quantitative and qualitative parameters of the influent.The purpose of this article is to present the experience gained in the operation of the wastewater treatment plant in adverse weather conditions and indicate lack of classification this type of objects as objects of critical infrastructure that is dangerous to the life, health, property or the environment.
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