Hyperion Outfall Diversion

2015 (Fall) Hyperion Outfall Diversion


2006 Hyperion Outfall Diversion

ENVIRONMENTAL DATA SUPPORT FOR THE HYPERION 5-MILE OUTFALL INSPECTION

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  • Monitoring Stations
  • Sampling Results
  • Inspection Fact Sheet
  • Inspection Release
  • 1-Mile Information
  • Shoreline Data Sheets
  • Offshore Data Sheets
  • Depth Profiling
  • CTD data
  • Particle tracks, Balboa Creek
  • Monitoring Meeting Agenda
  • Sand Bacterial Density

November 28-30, 2006

Geography of the Hyperion 5-mile diversion

The official City of Los Angeles Department of Public Works website.

During November 28-30, the Hyperion sewer discharge will be diverted from the 5 mile pipe to the shorter One-Mile Outfall to allow inspection of the longer outfall pipe. The discharge is typically 300-350 million gallons per day, with a total estimated volume of discharge to approach 875 million gallons. The Southern California Coastal Ocean Observing System has created this web site to provide up-to-date ocean environment information to assist coastal managers during this discharge event.

Map of Hyperion outfalls in Santa Monica BayMap of Hyperion outfalls in Santa Monica Bay.

Aerial Photography Taken During the Diversion

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Photography by Greg Deets, PhD Approximate time of photographs: 5:45 PM PST 2006-11-29 From the roof of the Harry Pregerson building at th Hyperion Treatment Plant This image shows the reversal of the plume now heading toward the north-east.

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Above photography by Dr. Jeroen Molemaker of UCLA IGPP. Approximate time of photographs: 10:00 AM PST 2006-11-28 At an altitude of 1500 ft. These photographs show the area in which the plume surfaced, marked by a red buoy and several birds.

Recent Surfzone Wave & Alongshore Current Predictions Shoreward of Hyperion Outfall

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Developed by: Guza, O'Reilly, Feddersen, Thomas of CDIP.

Objectively Mapped Surface Currents

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Plume Tracker

mbppts_ani_latest.gif mbpprf_20061203_1330.pngContour Plot by concentration and coastal distance

This display shows the results of a lagrangrian particle tracking algorithm applied to hourly surface currents. The plot indicates the tracking of surface waters from the Hyperion One-Mile Outfall. On an hourly basis, 100 particles are released at the outfall location and tracked for a 3 day period to provide an estimate of the spatial extent of the diversion discharge. New positions within the region are updated hourly and the color of the particle represents the age of the particle since it was released.

These computations and graphical displays are experimental and must be used with caution. While considerable effort has gone into ensuring the highest quality data, significant differences between measured currents and actual currents can occur. This information should not be used to make any navigational or other decisions that might endanger public safety or put anyone at significant risk. We reserve the right to ADD, CHANGE or DELETE any product WITHOUT PRIOR NOTICE.

HFRADAR 25-hour Averaged Surface Current Map

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For more currents, visit our interactive page.

NEWS ITEMS

BEACHES STAY CLOSED DESPITE DRAIN SWITCH

Area is off limits due to contamination, but officials say rain, not project to inspect pipe, is likely cause.
By Lee Peterson, Daily Breeze  December 1, 2006

DIVERS INSPECT INSIDE OF L.A.'S 5-MILE OCEAN SEWAGE OUTFALL

Associated Press  Mercury News November 29, 2006

SOUTH BAY BEACHES SHUT FOR PIPE CHECK

South Bay beaches will be closed through at least Thursday as officials check the condition of a five-mile sewage pipeline that carries treated wastewater into Santa Monica Bay.
The affected area extends about seven miles from Ballona Creek just south of Marina del Rey down to the Manhattan Beach Pier. It includes Dockweiler State Beach and parts of Manhattan Beach, including the popular El Porto surfing area.
By Stuart Silverstein, Times Staff Writer LA Times November 28, 2006

PIPE CHECK WILL CLOSE MILES OF SOUTH BAY BEACHES

As main outfall is inspected, Hyperion plant will route wastewater closer to the coast. Shores from Ballona Creek south to the Manhattan Beach Pier will close.
By Lee Peterson, Daily Breeze November 27, 2006

SANTA MONICA BAY MODELLING EFFORTS

Guza, O'Reilly, Feddersen, Thomas of CDIP have developed surfzone models for the LA sewage release. Among its features:

  • Nowcast (delayed 2 hours) Waves
  • Surfzone averaged alongshore currents for Santa Monica Bay
  • Time history of recent nowcasts near the alongshore location of the outfall

LOS ANGELES (NOVEMBER 17, 2006)

The City of Los Angeles' Hyperion Treatment Plant is sending divers into the Plant's Five-Mile Outfall on November 28th to 30th (weather permitting) to assess its structural condition, evaluate its reliability and identify potential trouble spots before they could become problems.
For more information visit LA Sewers' site.


Ocean current maps are a product of the Coastal Ocean Currents Monitoring Program (COCMP) and the National Oceanic and Atmospheric Administration (NOAA). The project is funded by the State of California from the California Clean Water, Clean Air, Safe Neighborhood Parks, and Coastal Protection Act of 2002 and the Water Security, Clean Drinking Water, Coastal and Beach Protection Act of 2002.

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Copyright © 2015 Southern California Coastal Ocean Observing System