Bosut lowland, through which the river Bosut flows, is well bounded and separated part of Eastern Croatian lowland. The lowland is full of swamps and meandering water courses and is also a forest rich area. Due to colonization, development of cities, advancement in science and technology the original appearance of the area has rapidly and dramatically changed. This work, in its core contains a description of the natural determinants of Bosut lowland, following colonization and economic development of the region and changes of the original landscape of Slavonia and Srijem. The systematic development of water management activities is analyzed. The needs and circumstances under which certain regulation and melioration facilities were built are described. The role and functioning of hydro technical structures and the entire hydro technical system as functional unit is explored, as well. At the end of this work the plans for further system arrangement and environmental problems which occur in Pobosuće are analyzed. The entire analysis leads to the conclusion that the hydro technical system in Pobosuće is dynamic, complex and unique; it has emerged during many years and current situation requires maintenance. New problems and needs for upgrading appear and therefore is important to track condition of the system and operate in accordance with the needs and possibilities.