In the construction of agricultural water-saving irrigation project, there are many lining channels with U-shaped cast-in-situ concrete. Because of its good seepage control effect, strong water conveyance capacity, good frost heave resistance and durability, and the saving of canal space, it has become a recognized good form of water-saving irrigation. U-shaped canal is a widely used seepage prevention method, and it is also a traditional rectangular and trapezoidal canal which extends an optimized cross-section structure. However, due to the difficulty of manual construction, the quality can not be guaranteed, forcing the hydraulic technicians in the design of such a design plan to stand back. After years of practice and promotion by hydraulic technicians, the construction level of concrete U-shaped canal machinery has been further improved.

Especially the research and development and promotion of the complete set of industrialized machinery for concrete U-shaped impervious canal construction have accelerated the construction speed of concrete U-shaped canal, and the high quality of concrete has made it in different terrain and air. Large and medium-sized canals and agricultural water-saving irrigation projects under waiting and using conditions have been widely used.

Channel water supply is the main way of water supply for farmland irrigation. In order to reduce seepage loss, many irrigation district renovation and comprehensive agricultural development projects have increased the construction of seepage control projects to alleviate the contradiction of water shortage in farmland irrigation. Among the various anti-seepage ways of canals, U-type canal has great potential of anti-seepage and water saving, and it is one of the important technologies that should be given priority.