What’s Being Protected? A little more about the Santa Ana River and Brine

Line Storm Response

Pre-Planning – Emergency Response Plans, Training

The Event Storm Impacts and Follow-On Actions – repairs,

lessons learned

“Tee” Levees in Orange County

Major Dischargers 6 Brackish Groundwater Desalters (50 MGD of potable

water) 3 Power Plants (2000 MW; ~1.5 M Homes) 2 State Prisons (10,000 inmates) Various Industries Hauled Brine Wastewater (4 stations, 60 trucks/day)

Economy of Inland Empire - over $1B, 4,000 jobs

Water Quality of Santa Ana River, OC Beaches

OCSD Treatment Plants

Pre-Planning Emergency Response Plan – OCSD, SAWPA,

Corps Annual plan update, meeting, training in fall “Just-in Time” Training

The Event Lots of rain in short period of time resulting

in high river flow and volume Twice daily coordination: Corps, OCSD,

SAWPA, OCWD, OC PW, RCFC

Top of Embankment

Conservation Pool 505’

543’

Spillway Elevation (188k AF)

594.4’

Inspection/Repair 100cfs

5,000cfs 3,000cfs

Debris Pool 498’

SAVI Ranch

Gypsum

Canyon

Coa

l Can

yon

91

241

Green R

iver Golf

Course

Grade Stabilizer at Green River Golf Course

Grade Stabilizer at SAVI Ranch

1/13/11 topographic survey over pipe 3 locations within floodplain - Orange County Two “scour pockets” over pipe found

SAVI Ranch Grade Stabilizer Green River Golf Course Grade Stabilizer

Coal Canyon – minor erosion, debris accumulation Work ongoing, OCSD contractor

Emergency rock placement, debris removal 1/20 - 25/11

Cost unknown at this time FEMA reimbursement will be requested by OCSD

Reach IV

Aliso Creek

Lateral to CA Rehabilitation Center

Auburndale Street Looking South

Euclid Ave. Looking North

Reach V Temescal Canyon RD near Trilogy RD

SAR is operated as an integrated system Team approach to response – lots of coordination Existing relationships key to success Ongoing joint activities, projects

Emergency Response Plan Good overall plan. Some fine tuning required. “Just-in-time” training for key participants was invaluable.

Prado Dam Water Surface at Record Elevation (529.4 ft) Water-tightness of the pipe, MASs confirmed. Seals at several MASs to be evaluated for improvement

especially at the higher water surface elevation.

Brine Line in Orange County Coordination team established: Corps, OCPW, OCSD,

OCWD, RCFCD, SAWPA created Effectively communicated issues and identified solutions. Result: reduction in dam outflow from 5,000 cfs to 2,500

cfs for 4 days and a reduction to 100 cfs to facilitate inspection/repair.

Group should be formalized in the agencies’ emergency response documents.

Areas of erosion over pipe, around MAS Traditional trouble spots remain. New locations identified. Erosion locations need to be evaluated for protection

measures to prevent or reduce future erosion.

QUESTIONS