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Hydraulics Lab: 2010-2011

North Diversion Channel Osuna and Singer Bike Notches


Final Modeling Report


The North Diversion Channel (NDC), built by the Corps of Engineers and maintained by Albuquerque Metropolitan Arroyo Flood Control Authority (AMAFCA), intercepts storm water from multiple open channels and carries the water north for discharge into the Rio Grande. Albuquerque utilizes the open channel storm drainage system as a north-south transportation corridor for pedestrians and cyclists. To accomodate cyclists, recessed bike paths (or 'bike notches'), have been placed in the channel at various bridge locations to allow for continuous cycling - uninterrupted by motor vehicles. Due to complicated hydraulics near two proposed bike notches, AMAFCA requested the help of University of New Mexico's (UNM) Hydraulics Laboratory. Both proposed bike notches are complicated by upstream tributary flows and the bike notch shown in the Figure Below is further complicated by bridge abutments that extend into the NDC. The bike notches near Osuna Road were modeled and tested in the lab. Model results determined neither of the proposed bike notches created adverse hydraulic effects nor standing waves near the bridges.




Hahn Arroyo Rehab


Final Modeling Report


Draining approximated 6.5 square miles before entering the North Diversion Channel, the Hahn Arroyo plays a vital role in conveying flood water in North Eastern Albuquerque.  Since its construction in the 1960s, the channel has deteriorated significantly.  The Albuquerque Metropolitan Arroyo Flood Control Authority (AMAFCA) has begun the rehabilitation of the Hahn. As part of this rehabilitation, AMAFCA would like to include measures to improve water quality or best management practices (BMPs).  AMAFCA engineers have designed a structure to be installed as an island in the channel (Figure Below).  However, due to the unpredictable nature of supercritical flow occurring in the Hahn Arroyo, AMAFCA engineers have requested the assistance of the University of New Mexico’s (UNM’s) Hydraulics Lab.  AMAFCA Engineer, Kevin Daggett, and research assistants have tested and improved two structures.  The structures were designed to remove debris efficiently up to the 1-year storm.