Abstract: An improved mixing device for combining two virtually immiscible substances. The device has a first inlet section for receiving a first substance, a second inlet section for receiving a second substance, a coupling structure to couple the first inlet section to the second inlet section, a mixing and expansion chamber adjacent to a first nozzle on the first inlet section for mixing the two substances conveyed to the mixing and expansion chamber, and a second coupling structure to couple the first inlet section to the second inlet section by way of a recirculation loop for further mixing and final discharge of the mixed substances.

Abstract: An upstream canal flow control device comprising a gate depending down into the flowing stream from a pivotal axis transverse to the stream and an arm extending downstream from the axis and gate containing a ballast to force the gate against stream flow, the ballast adjustable along the arm to cause the gate to retain an upstream water level as a function of the ballast position therealong.