Filed investigation on the effect of selecting suitable compensation gradient in reducing construction costs of check dams

Investigations show that in some cases the distance between check dams are decreased due to wrong ultimate slope. In this Study، a survey and investigation implemented on Gush and Bahreh catchments، Kartian، Kameh and Dasht watersheds which are located on upstream of Kardeh، Torogh، Shahid Yaghubi and Golestan dams، respectively. In this way، longitudinal section profile، ultimate slope، location، distances and height of dames with acceptable performance about upstream ultimate slope has been measured. Meanwhile، characteristics related to bed aggregates has been sampled and determined. Then، with the measure of dimensions regarding the ultimate slope، some equations which were based on primary slope of river direction has been developed. Our investigations claim that unsuitable design in ultimate slope had been lead decreasing the distances between dams; consequently، some of upstream weirs had been buried under sediments. To wrap it up، we have to argue that definition of distance between dams based on the measured ultimate slope could result 25. 4 percent descend in expenses of all studies weirs and dams construction and protection.