Analysis of outlines for the Vipava river conveyance management

Floods and droughts occur in the Vipava valley on more or less annual basis. Floods are causing the most damage in lower Vipava valley whereas droughts have bigger impact on middle and upper Vipava valley. Conveyance condition is a result of relatively long historical management development of the Vipava river and its effluents. Having said that, the purpose of this thesis was to present an overview of the development and state of management analysis which is the basis for further conveyance management of the river. For the point of reference we took the eighties of the last century, this is when the Assembly of Slovenia decided to transform Vipava valley into the “garden of Slovenia” and to start managing it for intensive agricultural production. From this period till 1990 originate the most important implemented measures for watercourses management in Vipava valley. Besides intensive agricultural development (irrigation, drying of land) a very important goal was flood safety. To implement these aims several measures were planned: drainage works, reservoir construction (riverine impoundments) and irrigation systems to regulations of the Vipava river sections and some of its effluents. By the beginning of the nineties when SFRJ fell apart the planned measures were not completely implemented, hence progress was halted and the condition of the valley has not changed much till this day in fact some of the implemented measures have already deteriorated due to insufficient maintenance.\ud Based on available literature this thesis contains an overview of planned, executed and unexecuted measures in Vipava river basin and together with directions for further research in improving the condition according to current goals of water management