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Project Highlights:

  • Addressed flooding at a transmission substation and a distribution substation.
  • Prepared an existing conditions hydrology memorandum.
  • Provided recommended short term and long term improvements to prevent flooding.

Project Summary

Location: Morro Bay, CA
MacKay Sposito provided engineering services for a substation project in San Luis Obispo County, California. The client was experiencing flooding at a large transmission substation and smaller distribution substation. MacKay Sposito assessed the existing conditions, including evaluating conveyance of stormwater during large flow events.

MacKay Sposito utilized LiDAR data and HEC-RAS to model inundation areas during specified storm events and to determine water surface elevations around the substation sites. A memorandum was then prepared summarizing the existing site conditions and water surface elevations during 10, 25, 50, and 100-year storm events.  Recommended improvements to eliminate flooding were also included, consisting of drainage channel improvements, utilizing pumps, and construction of a wall to prevent water from flowing into the substation.