In an attempt to assess the needs of the modernization of the North Channel of Obra, the construction began in 1852. The condition of drainage occurring on this course coming generally from the early 20th century and is unsatisfactory. This is the result of longstanding neglect and lack of maintenance. The first modernization works started in 1986. Undergoing on the North Channel of Obra are primarily made in the framework of four tasks, which was the regulation of the water course on a length of approximately 35 km 8 dams were built and 9 dams were demolished. The cost of upgrading the North Channel of The Obra was significantly different, what is the result of the works. They include the cost of reconstruction of the drainage channels, and the reconstruction of hydraulic structures. At this work, in addition to the needs assessment of the North Channel of Obra, further modernization needs were indicated.