HomeMy WebLinkAboutItem 10 PPP 11-13-19 Admin Committee - SP-152 OCSD Climate ResiliencySP-152 Climate Resiliency Study
Orange County Sanitation District
Nasrin Nasrollahi, Senior Engineer
Administration Committee
November 13, 2019
Reducing Greenhouse Gas Emissions
Regulatory Drivers
EO-S-13-08State agencies to plan for sea level rise and climate impacts through coordination of the state Climate Adaptation Strategy.
Assembly Bill 2800
State agencies shall
consider impacts of
climate change
when planning,
designing, building state infrastructure. (July 2020)
OCSD Strategic Plan
NPDES Permit
It is anticipated that a “Climate Change Effects Vulnerability Assessment and Mitigation Plan” is required as part of the NPDES Permit
Nov 2008 2019Sep 2016
Recent Climate Science References
Planning Horizons for Vulnerability Assessment
There is time to adapt, and time to course-correct through successive update cycles of the Resiliency Plan
2020 2050 2070 2100
30-Year
Horizon
Planning Horizon
for
New/Retrofitted
Infrastructure
Life-Cycle
Planning Horizon
for Most Assets
Planning Horizon
for Assets with
Extended Life-
Cycle Horizon
50-Year
Horizon
80-Year
HorizonCurrent
Climate Forces
Ventura Fire, California, Dec 2017. (@aghakouchak)
The Cocos Fire burns in San Marcos,
California, in 2014. (theatlantic.com)
Map data provided by the
California Public Utilities Commission
Wildfire and Extreme Heat
Flooding in Orange County
King Tide 2012, 8th St and Coast Hwy,
Huntington Beach, (OCREGISTER)
Flooded streets in Newport Beach
Storm Event 1983, OCREGISTER
Flooded streets in Huntington Beach
1938 flood and Santa Ana Levee failure
Storm Event, Dec 2010Balboa Island (www.scpr.org)
Pacific Ocean Plant No. 2
Extreme Flow Events
266 (1990)184
(2018)
475 485
550
521
494
459
501
411
563
100
150
200
250
300
350
400
450
500
550
600
1980 1985 1990 1995 2000 2005 2010 2015
Fl
o
w
(
M
G
D
)
Year
Average Monthly Flow (MGD) vs. Peak High Flow Events
Total average flow Peak Flow
Flooding
100-year FEMA Flood Maps (2019)
Sea Level Rise
(http://tidesandcurrents.noaa.gov/sltrends/sltrends.shtml)
20
1
8
19
2
6
Sea Level Rise (SLR) Projections
Blue: emissions continue to rise throughout the 21st century
Sea Level Rise (SLR) Projections
Blue: emissions continue to rise throughout the 21st century
Orange: emissions peak around 2040, then decline
Sea Level Rise (SLR) Projections
Blue: emissions continue to rise throughout the 21st century
Orange: emissions peak around 2040, then decline
1.54 ft
3.71 ft Recommended range
of sea level rise for
future CIP projects
Flooding and Sea Level Rise
100-year Flood + 2070 SLR
Access to Pump Stations is
Flooded
Sea Level Rise Projection of 3.71 ft is assumed in 2070
Tsunami Runup Elevation
American Society of Civil Engineers (ASCE) 7-16
Current maximum extent inundation zones.
Adaptation Example
ControlRoom
Hatch
PUMPSTATION
PumpRoom
Adaptation Example
Barrier Barrier
FLOOD PATHWAY
ControlRoom
Hatch
FLOOD PATHWAY
PUMPSTATION
PumpRoom
100-yrFEMAFlood
+2070SLR3.7ft
500-yr FEMA FloodwithoutSLR2019
100-yrFEMA Flood
+2050SLR1.5ft
100-yrFEMA FloodwithoutSLR2019
Watertight replacement of drywell hatches
Stop logs over doors or sealed doors
Recommended Capital Improvements for Lido Pump Station
4 drywell hatches below flood level
Flood pathway
Adaptation Example
Protecting the Treatment Plant
Recommendation: Plant No. 2 Boundary Wall
Summary of Impacted Facilities
Study Recommendations
FacilityConstruction
Cost
Impacted Planning
Horizon
Slater Pump Station $0.5 millionCurrent, 2050, 2070
Lido Pump Station $0.5 millionCurrent, 2050, 2070
15th Street Pump Station $0.1 million2070
A Street Pump Station $0.4 million2070
Plant No. 2 $28 million2050, 2070
OCSD Policy
OCSD aims to design, maintain and operate valuable wastewater
assets that withstand or adapt to adverse conditions in a
reasonable manner that is both cost-effective and sustainable for
present and future generations. These adverse conditions include
heavy rains, flooding, sea level rise, earthquakes, tsunamis,
extreme heat, wildfires and electrical grid interruptions.
Questions?