The aim of the project is to organise the drainage of rainwater in Katowice and to retain these waters in order to reuse them. Currently, rainwater in Katowice is drained to a significant extent through a general sewerage network. They are therefore mixed with sanitary waste water and are discharged into the environment through sewage treatment plants. Therefore, it is necessary to invest in distribution networks, which allows the burden of sanitary networks and sewage treatment plants to be relieved and opens up the possibility of the above described retention of rainwater and their re-use. The material scope of the project includes, among others, the construction of storage tanks and the construction, reconstruction and renovation of the rainwater drainage network. As part of the project, 11 underground retention tanks (gelbete and tubular) with a total capacity of 6497.8 m³ will be built. Water can be used, for example, to water the city’s green. The project also includes the construction of 3.84 km of rainwater drainage network, reconstruction of 0.26 km of rainwater drainage and renovation of 3.18 km of rainwater drainage.