Minimization of direct costs in the construction of torrent control structures

Abstract

Original scientific paperThe most important elements in the planning of the implementation of the torrent (flood) control projects which need to be estimated are time, costs (budget) and resource required. These three elements are interactive: a shorter duration of structure construction causes additional resources engagement and increased costs, and vice versa -greater costs provide a shorter duration of construction. This paper analysis direct project cost minimization for four torrent control projects. The construction duration and the dynamic plan of project activities have been determined using the CPM method of network planning. The optimization problem -minimization of direct cost of construction subject to constraints such as: given deadline, precedence constraints, and upper and lower bounded duration time of activities is solved using linear programming and Matlab toolbox. Our results show that applied methods ensure significant cost savings, which is an important challenge in the construction management. Keywords: cost minimization; CPM method; linear programming; torrent control Minimiziranje direktnih troškova izgradnje objekata za zaštitu od poplavaIzvorni znanstveni članak Najvažniji elemeni u planiranju provedbe projekata kontrole od bujica (poplava) su procjena vremena, troškova (buđžeta) i resursa. Ova tri elementa su interaktivna: kraće trajanje izgradnje strukture uzrokuje angažman dodatnih resursa i povećanje troškova i obrnuto, veći troškovi dovode do kraćeg trajanja gradnje. Ovaj rad se bavi minimiziranjem direktnih troškova projekta na primjeru četiri projekta kontrole bujičnih poplava. Trajanje gradnje i dinamički plan projektnih aktivnosti su određeni pomoću CMP metode mrežnog planiranja. Optimizacijski problem -minimiziranje direktnih troškova gradnje, uz ograničenja kao što su: zadan rok, redoslijed aktivnosti, gornja i donja ograničenja vremena trajanja aktivnosti, riješen je primjenom linearnog programiranja i sučelja Matlaba. Dobiveni rezultati pokazuju da primijenjene metode osiguravaju značajne uštede što je važan izazov organizacije građenja.

Effects of Erosion Control Works: Case Study—Grdelica Gorge, the South Morava River (Serbia)

“…The prevention consists of permanent control of erosion and torrential processes in the basin which is achieved by an integral river basin management system [9,68,69]. The changes in the intensity of erosion in the function of the performed erosion control works, the experience, the scope and the type of the works, the choice of technology, and the species for afforestation of the eroded land have a wider practical and theoretical significance for the improvement of methods for controlling water erosion and torrential floods because this is one of the most representative torrential areas in the Republic of Serbia and Southeast Europe.…”