Urban Water Institute 24th Annual Conference Oroville Dam Jack Safely, Imported Supply Unit Manager August 16, 2017 © 2007 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

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

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

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

100 Years of Feather River Hydrology

2015-16 Storage and Flood Control WY 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

Estimated 2017 Starting Point WY 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 0.9-1.1 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

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

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

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

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

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

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