Matrix is assisting the U.S. Air Force Academy in the development of a program for managing and maintaining all of the minor structures on the 17,000-acre base.  Most of the reinforced concrete box culverts, corrugated metal pipes, and reinforced concrete pipes were constructed or put in place in the 1950s and early-1960s.  The original scope of services for this project estimated the number of minor structures to be around 233; the Matrix team conducted a physical inventory as part of the contracted scope of services and identified over 400 minor structures across the base. 

Matrix worked with the academy’s civil engineering staff to create a naming convention for the minor structures and collected and cataloged historic records relating to the respective culverts. The Matrix team physically inspected the minor structures using the NBIS format customized to specific academy needs.  Two-page summary reports were prepared for each culvert, including coordinates, structure descriptions, photos, inspection results, maintenance and repair recommendations, design flows, hydraulic capacities, and load ratings. 

Design flows were calculated by developing an academy-specific regression equation based on drainage area and impervious area using the Stormwater Best Management Practices reports.  Drainage area and impervious area were delineated for each basin to determine the design flow.  Culvert and bridge hydraulics were completed using Bentley’s CulvertMaster software.

Services included:

  • Infrastructure Assessment and Master Planning
  • Hydrology Modeling and Analysis
  • Hydraulic Modeling and Analysis
  • Stormwater Management