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Environmental Data Support

For the Hyperion 5-mile outfall inspection

November 28-30, 2006
Geography of the Hyperion 5-mile diversion

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

Map of area around Hyperion diversion inspection
Map of Hyperion outfalls in Santa Monica Bay. 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.

Aerial Photography Taken During the Diversion
Photography by Dr. Jeroen Molemaker of the UCLA IGPP
Photography by Dr. Jeroen Molemaker of the UCLA IGPP
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.
Photograph by Greg Deets, PhD
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.

Recent Surfzone Wave & Alongshore Current Predictions Shoreward of Hyperion Outfall
Recent Surfzone Wave & Alongshore Current Predictions

Latest Objectively Mapped Surface Currents
Objectively Mapped Surface Currents

Latest Plume Tracker Snap-shot
Plume Tracking - Santa Monica Bay

Latest 25-hour Averaged Surface Current Map
25hr Avg'd Surface Current Map

Recent 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
December 1, 2006

Divers inspect inside of L.A.'s 5-mile ocean sewage outfall

Associated Press
November 29, 2006
Sign On San Diego   Mercury News

South Bay Beaches Shut for Pipe Check

The affected area includes Dockweiler State Beach and parts of Manhattan Beach, including the popular El Porto surfing area.

By Stuart Silverstein
Times Staff Writer

November 28 2006

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 complete article has been published by the LA Times.

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

The complete article has been published by the Daily Breeze.

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. more information (offsite)


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.