On the Flow, in the Gradually Contracted Open Channel (III)

On the design of the rapid acceleration divider

Abstract

This report is a proposal of the design for the rapid acceleration divider which is based on the characteristics of gradually contracted open channel.
Hitherto, we designed to satisfy the two conditions, i. e.
1) the flow over the weirmust be perfect overflow and
2) the back water level due to contraction mustlie below the permissible water level in the upper stream of the divider.
Therfore, according to this method, the division accuracy cannot be presumed without modeltests.
In this report, the auther added the third condition, that is 3) the division accuracy must be held below the permissible accuracy, to the above conditions and proposed to satisfy the three conditions in the design.
If the third condition cannot be satisfied in field circumstances, design may be made first, to satisfy the conditions 1) and 2), the velocity profile of diversion position calculated and then the distances of splitter walls decided on the basis of the profile.