Detention Basins
  Tucson Drainage | Upper Duck Creek | Etiwanda Debris Basin

Tetra Tech provided the Design Documentation Report and plans and specifications for the Tucson Drainage Area Project for the U.S. Army Corps of Engineers, Los Angeles District.  Responsibilities include developing hydrologic models (both HEC-1 and ADICPR) for the as-built condition at the Randolph South Detention Basin and for the final design at the Park Avenue Detention Basins, including the Standard Project Flood and Probable Maximum Flood.  Tetra Tech coordinated the design of the detention basins with the Arizona Department of Water Resources, Dam Safety Division.

The $24 million project includes four excavated detention basins, embankments, concrete arch culverts, extensive relocation of utilities, street closure and rerouting, temporary detours, demolition of buildings and athletic fields, box culverts under the high school and city streets, relocation of a 48-inch water transmission main, channels with earth invert and composition side slopes, aesthetic treatment consisting of textured concrete walls and overlays, new athletic facilities (buildings and fields), plantings, irrigation, new field lights, and environmental preservation and restoration.
 
The building designs included architectural, structural, electrical, mechanical and plumbing design.  The field lighting required compliance with the new Tucson requirements, including 100-foot tall poles and directional lighting, requiring electrical design and structural design of the poles and light fixtures.  Tetra Tech conducted monthly meetings with stakeholders to develop the designs and resolve issues raised by the Citizens Advisory Group.  Tetra Tech met with the high school athletic department officials and adjusted the relocation facility designs to meet their needs.