engleski

Osijek wastewater network - observations and characteristics of rainfall

Osijek is the largest city in eastern Croatian lowland region of Slavonia. Some specific stages observed in developing of its urban drainage system. From simple urban sewer network, over the past decade, a system of urban conglomerates has been established. Today urban drainage system is marked by the reconstruction of the older Northern main collector and preparing for the construction of the central wastewater treatment plant. The basic concept and design elements of the sewer system are based on the characteristics of local rainfall. Also, extreme rainfall events are particularly interesting for system efficiency and management capabilities. Because of that, observations of rainfall events began at the end of the last century at five locations with automatic ombrograph. The paper presents rainfall measurements and certain problems in their implementation. Preliminary analysis of registered rainfall events indicate their characteristics. Analysis of the extreme rainfalls, which are reported in form of one-minute rainfall, indicate a significant change in this century. Ombrographs recorded short-term rainfall events with amounts equal to the range of average monthly values. Finally the paper points out the necessity of a more detailed analysis of rainfall events in the Osijek’s area because of urban flooding risk, which could be mitigated by establishing a system real time control.

Osijek, urban drainage, rainfall distribution, extreme rainfall events

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