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COMPLETION OF ALEKSINAC URBAN AREA FLOOD PROTECTION SYSTEM
Abstract
The Moravica River is one of the most signifi cant right tributaries of the South Morava River. Its total length is 43 km and basin area 640 km 2. The municipal center of Aleksinac with its urban, commercial, industrial and cultural areas is situated close to the Moravica river estuary in to South Morava river. Due to position of the settlement and the natural river channel conditions, significant damages occurred in the past. Flood flows were endangering the inhabited part of Aleksinac, residential and public structures, church and road infrastructure, sometimes several times a year. In the 1970s a dam was constructed on the ri ver Moravica with multi-purpose reservoir „Bovan“. The main purpose of the reservoir is water supply, followed by flood protection of the downstream river reach. However, flood protection has not yet been fu lly achieved. In order to install fully operational flood protection system for the city of Aleksinac, preliminary calculations were run under variety of scenarios. It wa s shown that the most significant damages were on the right bank of the river. It was al so estimated that the riverbed was capable of evacuating 7 – 10 year return period flows of 40m³/s without flooding. This paper presents the final solution for completion of Aleksinac urban area flood protection system. The solution consists of tw o integrated parts: construction of closed cassette and enlargement of flow capacity at bridge cross section. For the river reach in the urban area, trapezoidal riverbed is designed on the bank revetment in both minor and major riverbed, so that the closed cassette could be built in order to prevent floods in the populated part of Aleksinac. A detailed calculation of closed cassette construction is presented in the paper. A par ticular attention was paid to the aesthetics and the needs of the people of Al eksinac. A bridge of historical value is located at the beginning of the closed cassette, where bank revetment joins the fill of the road. Its lower level does not satisfy required cross section for the design flood flow. The solution of this problem is also presented in the paper.
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References4
Potic O.: Fundamentals of hydro, Civil Engineering university of Nis;
Djordjevic B., Dasic T.: Hydroelectricity , Civil Engineering university of Belgrade, 2008;
Zivanovic S., Reports of flood control for 2010, PWMC “Srbijavode”, Serbia 2011;
The IHA Berne Declaration, Bern. 2000.
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