Mitchell Avenue Storm Drain
Client: City of Tustin
the City’s routine inspection of the existing storm drain system, they found the existing CMP drain had extensive corrosion
and portions of the pipe had rusted away. With an imminent potential for the pipe to collapse, block drainage and impact the
street and parkway above, the City hired Civil Works to determine
the best course of action and then prepare storm drain improvement plans for that option.
The storm drain is located in the parkway of Mitchell Avenue between Red Hill Avenue and Newport Avenue. The street is a local
collector with power poles in the parkway and numerous underground utilities within the roadway.
CWE analyzed several alternatives to rehabilitate or replace the storm drain. These alternatives included a new pipe within the
roadway, removal and replacement of the existing pipe, or in-place
pipe rehabilitation. We prepared a drainage report including an area
wide hydrology study. All alternatives were designed to capture a
10-year storm event. Due to the extensive underground utilities
and existing power poles, pipe replacement was cost prohibitive and
problematic. The preferred alternative involved pipe rehabilitation
using a UV cured PVC liner.
CWE prepared final construction documents for the pipe rehabilitation including upgrading existing catch basins and laterals,
installation of new catch basins and laterals and stubouts for future
storm drain extensions.