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Title: North Diversion Structure, Albuquerque, New Mexico : hydraulic model investigation
Authors: United States. Army. Corps of Engineers. Albuquerque District
Tate, Charles H.
Keywords: Alameda Outlet Structure
Hydraulic models
Hydraulic structures
Water diversion
Flood control
Albuquerque (N.M.)
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; HL-87-8.
Description: Technical Report
Abstract: The North Diversion Structure diverts storm runoff around Albuquerque, New Mexico, to the Rio Grande. Observed flow conditions at the Alameda Outlet Structure, where the flow is transitioned from supercritical to subcritical, have caused concern about the capacity of the as-built channel. A 1:40-scale model was used to determine the flow conditions approaching and through the Alameda Outlet Structure. Included in the model were approximately 1,500 ft of trapezoidal channel, the vehicle access ramp cut in the side of the trapezoidal channel, the trapezoidal to rectangular transition, the superelevated curve, Camino Arroyo Inlet, the flaring Alameda Outlet Structure with the railroad bridge and high-velocity pier, and the outlet channel with the graded riprap protection. The design capacity of the North Diversion Structure is 44,000 cfs. Flows in the model overtopped the channel walls for discharges above 30,000 cfs due to standing waves that formed at the vehicle access ramp. Removing the vehicle access ramp kept the flow within the channel except on the downstream side of Camino Arroyo Inlet where the flow ran up the wall. A deflector was designed to contain the runup flow within the channel. An envelope curve of discharge and tailwater elevation at the railroad bridge that defined the conditions dangerous to the bridge was developed. Tailwater rating curves were developed and compared with the danger zones. These curves passed through the danger zone with the as-built structure. Diagonal sills 1 ft high were designed that minimized the danger to the railroad bridge. It was determined that improving the exit channel and lowering the tailwater elevation would provide additional safety. Scour conditions in the outlet channel were identified. The riprap protection for the channel invert was stable with discharges up to 28,000 cfs. Flow in Camino Arroyo Inlet overtopped the converging walls in the drop inlet for flows above 2,700 cfs.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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