Apr
29
2013

News

Construction Commences on San Ramon Canyon Stormwater Flood Reduction Project

A groundbreaking ceremony marked the start of construction on the San Ramon Canyon Stormwater Flood Reduction Project in Rancho Palos Verdes.

California Transportation Engineering Services Groundbreaking Water

  • San Ramon Canyon Stormwater Flood Reduction Project groundbreaking
  • Construction underway in San Ramon Canyon
  • Groundrbeaking ceremony for San Ramon Canyon Stormwater Flood Reduction Project
  • The San Ramon Canyon Stormwater Flood Reduction Project
  • The San Ramon Canyon Stormwater Flood Reduction Project
  • Since 2005, the San Ramon Canyon has been steadily eroding due to flooding during heavy storms, causing traffic issues for the adjacent Palos Verdes Drive East switchbacks and Palos Verdes Drive South roadway below.
  • The erosion is creating deep vertical cuts in the canyon, which resulted in slope failure in some areas. If the flooding remained unchecked, the switchbacks could collapse without the possibility of repair

Rancho Palos Verdes, CA -

Since 2005, the San Ramon Canyon has been steadily eroding due to flooding during heavy storms, causing traffic issues for the adjacent Palos Verdes Drive East switchbacks and Palos Verdes Drive South roadway below.

The erosion is creating deep vertical cuts in the canyon, which resulted in slope failure in some areas. If the flooding remained unchecked, the switchbacks could collapse without the possibility of repair, and the debris flow and flooding could potentially affect more than 250 homes and 500 residents located below San Ramon Canyon in the City of Los Angeles.

This $17 million project will install a storm drain system that delivers storm water flows without causing further erosion to the existing canyon slopes and helps stabilize both the San Ramon Canyon slopes and the Palos Verdes Drive East switchbacks. This project will also improve access from Palos Verdes Drive East and Palos Verdes Drive South via steep maintenance access roads.

Harris & Associates and subconsultants prepared an initial project study report. The project included professional surveying, geotechnical, environmental and engineering design services for the preparation of plans, specifications and estimates for the project.

A few of the complexities of the design and project include creating two different tunnel designs,  including an outlet to the beach through a 150-foot high coastal bluff consisting of solid bedrock, controlling the Tarapaca landslide by filling major sections of the canyon, and implementing an innovative stormwater diversion system to make an existing storm drain system downstream functional.

The project funding sources included a grant from the California Department of Water Resources for $9.4 million. Cooperation between the City of Rancho Palos Verdes and the City of Los Angeles and Los Angeles County Flood Control helped to make the San Ramon Canyon Stormwater Flood Reduction project possible.

The construction is on track to reach completion in April 2014.


About Harris

Harris is a 100% employee-owned company focused on solving today's complex challenges in planning, construction and design. Our offices and project sites span the West Coast in California, Nevada and Washington with a staff of nearly 200 employee-owners. We focus on serving clients in water, municipal, transportation, and education markets. www.WeAreHarris.com

For More Information

Nathan M. Couch / Marketing Manager

925.827.4900, ext. 1125
nathan.couch@WeAreHarris.com


Download the Harris Media Kit