Method and apparatus for control of an upstream water level

A method for adjusting a weir for the control of upstream water levels, the method comprising:

• slidably mounting a trough assembly within an open frame having a filler bar headrail;
• adjusting the elevation of said trough assembly by means of a tandem screw jack assembly, said tandem screw jack assembly being mounted to said filler bar headrail and having two vertical screw shafts extending downwardly from said filler bar headrail and bolted to said trough assembly;
• rotating a hand crank connected to said vertical screw shafts;
• and
• raising or lowering said trough assembly by said vertical screw shafts of said tandem screw jack assembly, so that the elevation of said trough assembly is comparable to the elevation of the upstream water level.

In an improved adjustable weir for the control of upstream water levels, the improvement comprising:

• 1. a rectangular U-shaped open frame capable of installation in a water bearing aqueduct, channel or canal, said open frame having two vertical side rails and capped with a filler bar headrail;
• 2. a trough assembly slidably mounted within said open frame, said trough assembly including a support plate, the upper portion of which forms a trough;
• 3. an sluice pivotally mounted on said trough about an axis of rotation, said sluice gate comprising:
• a. a sector-shaped gate leaf positioned on one side of said axis of rotation, a first ballast container centered on said axis of rotation and a second ballast container at the opposite end of said axis from said gate;
• and
• 4. a tandem screw jack assembly, mounted to said filler bar headrail of said frame, said tandem screw jack assembly having two vertical screw shafts extending downwardly from said filler bar headrail and fixedly bolted to said support plate of said trough assembly, whereby the elevation of said trough assembly may be raised or lowered in relation to the elevation of the upstream water level.