The main differential equation of steady motion of a fluid with a variable discharge with bilateral separation of the flow in open canals can be used only in the case when the distance between axes of the diversion is taken in limits from 0 tol, wherel is the width of opening of the diversions to the downstream face of the last diversion. If the diversions are located at a distance greater thanl from one another or at a distance at which interaction of these pairs of diversions with one another is not observed, then a system of main differential equations of steady motion of a fluid with a variable mass obtained for each pair of diversions separately is set up.

By mathematical investigation, it has been demonstrated that the physical essence of water flow in a “star” distributor can be described by the equation of G. A. Petrov and P. G. Kiselev. The hydraulic parameters entering into this equation depend on the geometric scheme of distribution.

It follows from the investigations indicated above that in the case of bilateral division of the flow (in the absence of frictional forces) in parabolic channels, the surface curve of the flow is similar to the surface curve in the case of the division of a flow in rectangular channels.

1.The relationships (26) and (27) obtained indicate that at the site of division of the flow there occurs a change in the depths ho and hcr related to the law of variation of discharge. Hence the line of the normal and the line of the critical depths will have a curvilinear outline. 2.For bilateral symmetric diversion of water the specific energy of the basic flow in section I-I is greater than the half-sum of the specific energies of the dividing flows.

The use of noncontact, low-inertia elements (semiconducting transistors) has enabled us to create a bridge circuit with a very low balancing time. Measurements may be made in 20 msec by using the apparatus described.