1. Urban Water Institute 24th Annual Conference Oroville Dam
Jack Safely, Imported Supply Unit Manager
August 16, 2017
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2. Facility Overview Lake Oroville Hyatt Powerplant Sacramento River
Feather River
Lake Oroville
Lake Oroville is the SWP’s major conservation facility, and has a capacity of 3.54 million acre-feet.
Bay Delta
San Joaquin River
San Luis
Reservoir
Edmonston: highest lift pumping plant in the State Water Project.  With 14 pumps rated at 320 cubic feet per second, Edmonston lifts water 1,926 feet to cross the Tehachapi Mountains
Hyatt Powerplant
Hyatt Powerplant is an underground, pumping-generating facility, with 6 units, 3 of which are pumping-generating units. Installed generating capacity is 16,950 cfs.
California Aqueduct

3. These are large facilities
1,018 ft
Flood Control Spillway
178 ft wide by 3,050 ft long

4. Oroville Background Completed 1968 Multi-purpose facility
Funded by State and Federal money
22% Federal contribution
~$70 million
Equivalent to 750 TAF flood control reservoir
Original plan included Marysville facilities

5. 100 Years of Feather River Hydrology

6. 2015-16 Storage and Flood ControlWY CO UT AZ NM
150%
Northern
Capacity: 3.5 MAF
210%
Southern
Sacramento River
Shasta Lake
San Luis
Reservoir
Lake Oroville
San Joaquin River
161%
Water Year
to Date
204%
8-Sta
Flood Boundary
180%
Central
216%
5-Sta
210%
Southern
215%
6-Sta
San Luis
As of 3/8/2016
2.12 MAF last time it was this high was in August 2013
First wave of storms mid Dec to mid Jan moderate inflow (slope of line not very steep)
Second wave of storms from mid to late Jan we see higher rate of inflow (steeper slope - ground more saturated)
Last few weeks, starting to see inflow slow down due to dry conditions.
226% LA
185% SD

7. Estimated 2017 Starting PointWY CO UT AZ NM
150%
Northern
Capacity: 3.5 MAF
210%
Southern
Sacramento River
Shasta Lake
San Luis
Reservoir
Lake Oroville
San Joaquin River
161%
Water Year
to Date
204%
8-Sta
Flood Boundary
180%
Central
216%
5-Sta
210%
Southern
215%
6-Sta
Approximately
MAF depending on hydrology
San Luis
As of 3/8/2016
2.12 MAF last time it was this high was in August 2013
First wave of storms mid Dec to mid Jan moderate inflow (slope of line not very steep)
Second wave of storms from mid to late Jan we see higher rate of inflow (steeper slope - ground more saturated)
Last few weeks, starting to see inflow slow down due to dry conditions.
226% LA
185% SD

8. What Is the Post-Oroville Future?
Changes in Flood Control Pool or Levees?
Emergency Action Plans
Inundation Mapping
Spillway Evaluations

9. Legislation on Dam Safety
AB 1270 and SB 92
Requires DSOD to perform annual visual & physical inspections of dams & reservoirs; cost of inspections to be passed on to dam owners
Inspection reports to be posted on internet
DSOD to submit 5-year infrastructure improvement, maintenance & funding plan for dams & reservoirs maintained by State
Classifies dams into hazard classifications (Extremely High, High, Significant, Low)
Emergency Action Plans (EAPs) required for all dams except Low Hazard

10. Dam Emergency Action Plans (EAPs)
Purpose
Identify potential emergency conditions that could occur at a dam, & prescribe procedures to follow to minimize loss of life & property damage
Not previously required in California
EAPs Provide Guidance to Responders
Evaluating hazards
Determining level of emergency
Defining communication protocols

11. Dam Emergency Action Plans (EAPs)
New Requirements
EAPs required for Extremely High, High & Significant classifications
EAPs to follow FEMA guidelines
CalOES to review & approve EAPs
Owner has responsibility to coordinate with local agencies
Due Dates
Extremely High Classification – January 1, 2018
High Classification – January 1, 2019

12. Inundation Maps Purpose New Requirements Due Dates
Show maximum water surface resulting from a complete dam breach & draining of a full reservoir (former scenario)
New Requirements
Inundation maps required for Extremely High, High & Significant classifications
New failure scenarios to be identified & evaluated
Required to be included in EAPs
DSOD to review & approve inundation maps
Due Dates
Extremely High Classification – January 1, 2018
High Classification – January 1, 2019

13. Spillway Re-Evaluations
Purpose
Perform detailed evaluations of spillways at Extremely High & High Hazard dams
Comply with Governor’s directive
DSOD Letters to Dam Owners
Extremely High & High Hazard classifications
Scope of Assessment
Hydraulic capacity
Structural integrity (Concrete lining, drainage system)
Geologic hazards & geotechnical conditions
Review of original construction
Work Plan due to DSOD by 9/1/17