Drought Operations1. CVP Contract – 25% Allocation 33,250 33,250 2. Placer County Water Agency...
Transcript of Drought Operations1. CVP Contract – 25% Allocation 33,250 33,250 2. Placer County Water Agency...
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Drought Operations
Water Operations Department
August 11, 2015
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Water Supply Briefing
• Current Water Supply
•WY15 Drought Operations
•Drought Operations Plan
• Future Water Supply
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Ernst Schuetz
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Current Water Supply Reservoir Storage
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Total System Storage
365,000 acre-feet (59% of avg, 48% of capacity)
Aug 9, 2015 Average Capacity
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WY15 Drought Operations Freeport Regional Water Project
• Coordinated operation – Sacramento County Water Agency
– U.S. Bureau of Reclamation
• 90 million gallons per day
• Plan to deliver 40 TAF of supplemental supply in WY15
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• State Water Resources Control Board notice posted on April 23, 2015
• Curtailment of post-1914 appropriative right diversions from San Joaquin River watersheds
• Reduced EBMUD storage by 24,000 acre-feet
• Reduced cold water storage for fish habitat preservation
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WY15 Drought Operations Mokelumne River Curtailment
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WY15 Drought Operations Curtailment
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24,000 AF
June 30
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*Projected storage on September 30, 2015
WY15 Drought Operations Total System Storage Projections
Runoff
Total System Storage*
Without CVP & Transfers
With CVP & Transfers minus
Gainsharing
215 TAF 300 TAF 330 TAF
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WY15 Drought Operations Estimated Supplemental Water Supplies
Supply
Estimated Quantity (AF)
Total Cumulative
Quantity (AF)
WY2
015 1. CVP Contract – 25% Allocation 33,250 33,250
2. Placer County Water Agency Transfer 7,000 40,250
WY2
016
3. Placer County Water Agency Transfer 5,000 45,250
4. Glenn-Colusa Irrigation District Transfer 0 45,250
5. Sycamore Mutual Water Company Transfer 5,000 50,250
6. Reclamation District 1004 Transfer 8,250 58,500
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WY15 Drought Operations Supplemental Supply – Transmission
SACRAMENTO RIVER
MOKELUMNE RIVER
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WY15 Drought Operations Drought Operations Constraints
• Operate water system to meet competing priorities • Manage water system for water supply • Manage water system to comply with Joint Settlement
Agreement requirements for cold water management • Manage reservoirs for water quality
• Taste and Odor Challenges
• Seasonal algae blooms in terminal reservoirs • Significant change in volume in Pardee Reservoir
• Facility issues
• Reverse flows in the Sacramento River • Maintenance and repairs
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WY15 Drought Operations Supplemental Supply – Treatment & Distribution
•Deliver water to San Pablo and USL Reservoirs
•Maximize Sobrante and USL Water Treatment Plant production
•Meet all drinking water standards
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WY15 Drought Operations Treatment Constraints
• Taste and Odor events happen more frequently and are more severe during drought
• Warm weather and poor water quality can lead to algal blooms
• Most of the time, the ozone systems at the treatment plants can handle it
• Increased geosmin levels require reductions in water treatment plant production
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WY15 Drought Operations Supplemental Supply – Treatment & Distribution
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geos
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Raw Water Geosmin, Sobrante Water Treatment Plant
Typical ozone dose is effective up to 50 ng/L.>50 ng/L, extra measures are needed
Peroxide system added
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Drought Operations Plan Taste and Odor Management
Short-term
• Ongoing monitoring program
• Adjust chemical doses at plants
• Change inlet gates
• Decrease plant production
Long-term
• Upgrading the ozone systems
• Installing Hypolimnetic Oxygenation System in San Pablo Reservoir
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Drought Operations Plan Taste and Odor Management - Continued
As water levels get lower, options become limited
• Algae live near the surface (sunlight)
• Inlet gate changes are an option when water levels are high enough
• Two inlet gates are needed to lower Pardee Reservoir elevation
• No ozone at the Mokelumne Aqueduct treatment plants (Walnut Creek, Lafayette, Orinda)
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Drought Operations Plan Pardee Reservoir Schematic Cross-Section
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Unit #1 & 2 ~EL375’
Unit #3 & Sluice ~EL260’
Pardee Tower (Mokelumne Aqueduct
Intake)
EL550’ Gate
EL520’ Gate
EL490’ Gate EL460’ Gate
(Not to Scale)
Spillway Crest EL567.7’
MOKELUMNE RIVER
PARDEE DAM
PARDEE RESERVOIR
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Drought Operations Plan Pardee Reservoir Schematic Cross-Section
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Unit #1 & 2 ~EL375’
Unit #3 & Sluice ~EL260’
Pardee Tower (Mokelumne Aqueduct
Intake)
EL550’ Gate
EL520’ Gate
EL490’ Gate EL460’ Gate
(Not to Scale)
Spillway Crest EL567.7’
MOKELUMNE RIVER
PARDEE DAM
PARDEE RESERVOIR
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Drought Operations Plan WY15 Drought Actions
FREEPORT
CONSERVATION RECYCLING
INTERTIES
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Drought Operations Plan Water Supply Management Program (WSMP) 2040
• Identifies and recommends solutions to meet dry-year water needs
• Solution includes conservation, recycling and supplemental supply
19 Year 1 Year 2 Year 3
35 TAF
65 TAF 65 TAF
165 TAF of CVP water over three consecutive years
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Drought Operations Plan Drought Stages
Stage 0 1 2 3 4
Demand Reduction
Voluntary 0-15%
Voluntary 0-15%
Mandatory up to 15%
Mandatory >=15%
Supplemental Supplies
Up to 35,000 acre feet
35,000-65,000 acre feet
> 65,000 acre feet
Rates and Charges
Normal rates
Normal rates
Normal rates
+ 8%
drought surcharge
Normal rates
+ 20%
drought surcharge
supersaver
recognition*
excessive use penalty*
Normal rates
+ 25%
drought surcharge
supersaver
recognition*
excessive use penalty*
*Supersaver recognition and excessive use penalty not subject to Prop 218 requirements. 20
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Drought Operations Plan Planning for 2016 and 2017
Stage 4 Drought
• Making system improvements to bring in more supplemental supplies from transfers (increase from 65 to 100 TAF)
• Identifying options for future water transfers
• Accelerating improvements to reduce taste and odor issues
• Working collaboratively with the Bureau of Reclamation and our partners
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Drought Operations Plan Supplemental Supply – Transmission
SACRAMENTO RIVER
MOKELUMNE RIVER
90MGD
35MGD
35MGD 20MGD
10MGD 15MGD
100MGD
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Drought Operations Plan Supplemental Supply Rate of Diversion Improvements
Facility Rate of Diversion (MGD) (TAF)
Briones PP 15 8
Walnut Creek WTP 10 to 20 11
San Pablo WTP 20 to 25 14
Sobrante WTP 35 36
USL WTP 35 36
Total 105 23
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Drought Operations Plan San Pablo WTP - Improvements
Project Cost Complete
Repair and Rehabilitate WTP $3.5M Oct. 2015
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Drought Operations Plan New Treatment Test of FSCC Water
• Current Permit specifies conventional water treatment, consistent with plants taking supply from Sacramento river
• Special monitoring characterized FSCC water
quality in 2012, and continues through 2015 • New water treatment study at pilot scale started
in 2014 and finished in 2015 • May result in expansion of treatment plant
options and ability to take full allocation of supplemental supply
• Discussions with DDW underway
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Drought Operations Plan Sobrante WTP - Improvements
Project Cost Complete Reason
Replace Ozone System $12M Mid- 2017 - System Upgrade - Maintain Higher Plant
Production
San Pablo Res. Hypolimnetic Oxygenation System (HOS)
$3.7M Mid- 2018 - Taste and Odor Control - Maintain Higher Plant
Production
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Drought Operations Plan Upper San Leandro WTP
Project Cost Complete Reason
Replace Trac-Vac Solids Removal System
$2.7M Early-2017 - System Upgrade - Maintain Higher
Plant Production
Replace Ozone System $12M Mid-2018 - System Upgrade - Maintain Higher
Plant Production
Solids Handling Improvements $2.0M Early-2018 - Reduce water waste
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Drought Operations Plan Supplemental Supply Rate of Diversion Improvements
San Pablo WTP
Walnut Creek WTP
Briones Reservoir
Existing
20-25 MGD
10-20 MGD
15 MGD
70 MGD
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Future Water Supply 4 Year Storage Decline
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30 TAF Encroachment
300 TAF Deficit
330 TAF (4th lowest)
25 TAF SS 15 TAF Conservation
40 TAF SS
45 TAF Conservation 155 TAF Actions
455 TAF Deficit w/o
Actions
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Future Water Supply Total System Storage – as of September 30
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630 TAF 624 TAF
571 TAF
542 TAF
404 TAF
330 TAF
311 TAF 300 TAF
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Future Water Supply Potential for El Nino
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Looking Forward to a Snowy Winter in Water Year 2016!
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Making Plans for a Dry 2016