Man, with his presence and the use of space, has been changing the Earth's surface and the functioning of the entire biotope. Due to the growing urbanization, drainage coefficients have increased and the possibility of rain water retention on the surface has decreased. Among other things, large interventions in nature are also caused by the construction of motorways. We often deal with a great amount of rainwater coming very quickly from the road surface during heavy rain, which is often quite contaminated and as such unsuitable for release into the natural environment. Therefore, the rainwater from the road surface must first be properly cleaned before discharge, as determined by the applicable law. The type and degree of purification are determined according to the vulnerability of the area where the traffic route runs. Due to the lack of sufficient drainage, it is often necessary to hold
rainwater in reservoirs, where water is partially cleaned and slowly released into the environment. If necessary, additional cleaning of storm water is provided. Recent studies demonstrate the effectiveness of cleaning, represented by the reservoir with additional functions of an oil separator, settlement tank, and a reservoir with ground infiltration. As with all other drainage systems, for efficient operation of these cleaning appliances regular cleaning and maintenance is required.