The OBERMEYER Spillway Gate system is a patented bottom hinged spillway gate with many unique attributes that include:
The OBERMEYER Spillway Gate system is most simply described as a row of steel gate panels supported on their downstream side by inflatable air bladders. By controlling the pressure in the bladders, the pond elevation maintained by the gates can be infinitely adjusted within the system control range (full inflation to full deflation) and accurately maintained at user-selected set-points.
The spillway gate system is attached to the foundation structure by stainless steel anchor bolts (epoxy or non-shrink cement grout as design dictates). The required number of bladders are clamped over the anchor bolts and connected to the air supply pipes. When the bladder hinge flaps are fastened to the gate panels, the installation of the strong, durable and resilient crest gate system is complete.
The individual steel gate panels and air bladders are fabricated in widths of five or 10 feet, (1.5 meters or 3 meters for metric installations) for systems up to 6.5 feet (2 meters) high. Systems higher than 6.5 feet (2 meters) use various standard width air bladders such that the height/length ration is less then approximately 1.0.
The gaps between adjacent panels are spanned by reinforced EPDM rubber webs clamped to adjacent gate panel edges. At each abutment, an EPDM rubber wiper-type seal is affixed to the gate panel edge. This seal rides up and down the stainless steel abutment plate, keeping abutment plate seepage to a minimum. For installation in cold climates the abutment plates are provided with heaters to prevent ice formation. Alternatively, rubber seals may be fixed to the abutments or piers which engage the raised gate panels.
The OBERMEYER Spillway Gates are custom designed to conform to any existing or desired spillway cross-section with a minimum profile when in the lowered position.
The wedge-shaped profile of the OBERMEYER Gate System causes stable flow separation from the downstream edge of the gate without the vibration-inducing vortex shedding associated with simple rubber dams during overtopping. This results in vibration-free operation and excellent controllability throughout a wide range of head water elevations and gate positions.