Post on 30-Jul-2015
transcript
Kwatt/1000 gal
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current desalination
Kwatt/1000 gal
Energy Intensity
Desal = 12 X electricity of current production
Source: Kennedy/Jenks, Energy White Paper
“Fracking” = Hydraulic fracturing of underground rock in order to extract natural gas or oil. Some chemicals that have been used in fracking:
• diesel fuel • benzene
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Natural gas extraction has become more environmentally damaging.
Why not use renewable energy to power the plant?
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Renewable energy sources “are not feasible at this time for power requirements typical of large-scale industrial-type applications.”
- EIR, Santa Cruz’s Integrated Water Plan (2005)
It’s not feasible..
City Council:
“We want a carbon-neutral plant.”
How can the plant be carbon neutral when renewable energy to power the plant has been ruled out?
“Little Green Lies” “Often the Renewable Energy Credit trade seems like little more than buying and selling bragging rights, rather than incentives that lead to the construction of wind turbines and solar panels.”
- “Little Green Lies”, Business Week, Oct 29, 2007
The public must be firm and unwavering in demanding “no offsets” because this sort of monkey business is exactly the type of thing that politicians love and will try to keep. - James Hansen
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The problem that the City was
trying to solve
• 2003 Integrated Water Plan estimated a 45% shortfall in a worst-case drought
Water Supply Advisory Committee
Task: “…analyze potential solutions to deliver a safe, adequate, reliable and environmentally sustainable water supply.”
The Water Supply Advisory Committee considerations: 1. Fish habitat constraints on water diversion 2. Climate change resulting in lower stream flow
The Water Supply Advisory Committee considerations: 1. Fish habitat constraints on water diversion 2. Climate change resulting in lower streamflow
WSAC technical team: • 3 billion in storage solves the problem • 7 billion available storage in the aquifers
Winter river water stored in the aquifers
Well water to Santa Cruz in droughts
Aquifer Recharge Concept AKA: Water Banking
Kennedy/Jenks (2011) re: storm water infiltration
• 1000 acre feet per year lost due to impervious surfaces in Scotts Valley Dr. & Mt. Hermon Rd area
• Average Scotts Valley use (2010-2013) = 1350 acre feet/year
Aquifer Recharge = Win-Win-Win
ü Reverse salt water intrusion ü Bank water for droughts ü Restore base-flow in streams
Conservation Measures
ü Interim strategy for water security, pending aquifer recharge
Lake levels: Difference between 80% full and 64% full = 450 million gals
Desal output for 6 mo. = 455 million gals
Conservation Measures
ü Saves $$ on water supply investments
e.g. Desal EIR: desal cost per million gallons = $10,750 Current water supply cost/mg = $500