At present, major works on the main rivers of Central Asia (Amudarya, Zerafshan, Chirchik, and others) have been carried out and are working to protect the banks from erosion and regulate channels for guaranteed water intake into irrigation channels in areas of great length. For this widely used transverse dam (spur). During the interaction of the dam (spur) with the flow, there is intensive siltation of the inter-amber space. Due to the limited areas for agricultural land in densely populated areas, which usually adjoin the valleys of large rivers, spontaneous and unwarranted development of inter-dammed space on regulated sections of rivers occurs, which may lead to a violation of the design regime of the regulated part of the river. In this regard, the development of methods for the hydraulic calculation of a constrained flow with a partial development of inter-dam space is one of the urgent problems of scientific and practical importance in the design of control structures, their construction, and operation.