El Toro Marine Corps Air Station in Irvine, California was built in 1942.A mixed open culvert was constructed at the top of Agua Chinon Creek for the construction of runways and roads to assist base operations.The base was subsequently decommissioned and sold for development.The plan includes the construction of a large residential and sports center, golf course, and facilities and land dedicated to landscaping and agriculture.This will require a plan to address excess stormwater runoff in future developments.
The soft bottom section of the Agua Chinon is over 3,000 inch feet.One of the main challenges engineers faced when designing the project was to provide habitat by maximizing the area of the natural bottom riverbed while providing the necessary protection from heavy rain events.The natural slope of the existing terrain exceeds 1.5%, which is too steep to maintain non-erosive rates.
Due to limitations in concrete use, grade differences and the need to maximize natural bottom access, engineers designed a natural bottom open channel drainage system utilizing a series of 28 gabion drop structures.Each identical gabion spans 30 feet across the channel and is randomly placed to create a different floodplain and create a natural feel.Flows used for the design were derived from the revised San Diego River Flood Control Master Plan, which established 100-year runoff based on projected future land use information and county hydrological standards.Hydraulic calculations determined the optimum slope for stability to be less than 0.5%.
The gabion structures along Agua Chinon Creek have been tested by Mother Nature.In early 2018, Southern California experienced a historic rainfall event that resulted in flooding and mudslides across the state.The gabion structure holds up, slowing the flow of water and controlling erosion and flooding.
Stormwater Solutions staff invites industry professionals to nominate what they consider to be the most outstanding and innovative water and wastewater projects for recognition in the annual Reference Guide issue.All projects must have been in the design or construction phase within the past 18 months.
©2022 Scranton Gillette Communications.Copyright Sitemap | Privacy Policy | Terms and Conditions
Post time: Mar-17-2022