Law of lateral velocity distribution in trapezium-arch channel and discharge measurement;

Analytical solution to concentration distribution discharged from a stream of effluent into trapezoidal channel flow;

A series of experiments are carried on through two kinds of different link transition section(the distortion and the partition wall) as well as the different weir thickness and gap width at the trapezoidal channel.

By means of iteration, a table is achieved for the solution of depth to width ratio and width to depth ratio of trapezoidal channels.

The discharge coefficient (C_d) of cylinder flow-measuring flume on the trapezoidal canals has a good correlation with the relative water head (H_s/L) and co.

Based on the calculation of the canal sidewall stability and the hydraulically best canal cross section,a concept is put forward that the side slope ( m ) of a lined trapezoidal canal is determined by the minimal thickness of the concrete slab according to cost analysis and the land taken up by the canal.