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Drainage Improvement, University of California, Irvine, CA

Accord Engineering won a competitive bid to perform a storm channel restoration project for the University of California, Irvine. As a result of tremendous campus build-out in recent years, the storm drainage capacity in an existing channel was overwhelmed due to increased runoff. The objective of the project was to replace one clogged storm drain pipe in this channel with two new pipes. In addition to new storm drain pipes, the existing channel face was widened to increase inflow and outflow capacity with new riprap channel protection. This project prevented recurrence of flooding of a day school next to the storm channel due to inadequate drainage capacity. The following work was performed:

  • Demolish existing drainage structure (including over 200 feet of 36-inch-diameter RCP, RC headwall, manholes) at the site that became obsolete.
  • Install over 300 feet of new 36-inch-diameter HDPE drainage pipes and associated joints to existing RCP and catch basins.
  • Construct new RC headwall and inflow/outflow flares.
  • Regrade and construct new channel sections with over 6,000 square feet of stone riprap protection
  • Restore vegetation in the area that was damaged by previous floods
  • Restore surface grade in the area to promote surface runoff flow.

Challenges and Solutions

The project was located next to a school that only recessed during a specific summer break. All work was required to be completed before the start of school. Additionally, the site was not draining well due to previous flooding and required major grading to install the new pipes and drainage structures. The work sequence also required careful planning to divert and maintain the drainage flow.

Accord Engineering worked closely with the UCI project manager in interfacing with the school personnel and maintained the work area so as to not impact the school activities.

The project was completed on time and within budget without incidents. The work scope was later increased by UCI to extend the channel protection further.

More pictures from this very important project