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WATER SUPPLY - System Reliability -
Florida Keys Aqueduct AuthorityWORKSHOP
February 18, 2014
Groundwater Supply◦ Quantity◦ Quality
Infrastructure◦ Treatment◦ Transmission◦ Distribution
Response Plans◦ Long-term ◦ Short-term ◦ Emergencies
Reliability Components
SUPPLY AND DEMAND
Master Plan Developed In 2006◦ Population/Flow Projections
showed Increased Demands
◦ Major Capital Components New RO WTP and Well field New Booster Pump Stations New Distribution PS/Storage Continued R/R
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
0
5
10
15
20
25
30
SUPPLY AND DEMANDAvailable Water Supply (2006 -2030)
Floridan Blend and Bypass (mgd)
Reclaimed Water
Reverse-Osmosis WTP (mgd)
Biscayne Aquifer (mgd)
Mill
ion
Gallo
ns p
er D
ay (M
GD) -
Aver
age
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
0
5
10
15
20
25
30
SUPPLY AND DEMANDWater Demand Projections - 2005
Floridan Blend and Bypass (mgd)
Reclaimed Water
Reverse-Osmosis WTP (mgd)
Biscayne Aquifer (mgd)
2005 Avg Day Projections thru 2026
Mill
ion
Gal
lons
per
Day
(MG
D) -
Ave
rage
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
0
5
10
15
20
25
30
SUPPLY AND DEMANDWater Demand Projections -
Current
Floridan Blend and Bypass (mgd)
Reclaimed Water
Reverse-Osmosis WTP (mgd)
Biscayne Aquifer (mgd)
Adjusted 2013 Avg. Day Projections
2005 Avg Day Projections thru 2026
Mill
ion
Gal
lons
per
Day
(MG
D) -
Ave
rage
Decreased demand projections: Reduced need for added booster pump stations
◦ Property, structures, equipment and electric
Changed economic conditions: Delays construction of distribution pump
stations and storage tanks
SUPPLY AND DEMAND
WATER QUALITY
Wellfield and Aquifers Biscayne meets all standards- Nitrate only parameter with up
trend Floridan meets standards, other
than chlorides. RO system removes chlorides.
Supply Protection• Land management of wellfield
• Monitoring of ground and surface waters
• Action plans based on monitoring data and/or events
Transmission Main Assessment
Vulnerability Assessment to determine
◦ Areas where leaks and corrosive soils occur
◦ Difficult access for repair◦ Older sections for replacement
INFRASTRUCTURE INTEGRITY
Pipeline ProtectionCathodic Protection against corrosive environment Steel pipe section along transmission main Steel water storage tanks
INFRASTRUCTURE INTEGRITY
OPERATIONAL REDUNDANCY
Water Supply and Treatment
Multiple Wells
Multiple Treatment Units
Emergency Power Generation
Electric and Diesel Pumps
OPERATIONAL REDUNDANCY
Water Supply and Treatment
2 MGD Emergency Seawater Desalination Stock Island(Diesel)
1 MGD Emergency Seawater Desalination Marathon (Diesel)
OPERATIONAL REDUNDANCY
Transmission Pipeline Pumping Capability
Four Booster Pump Stations
Electric and Diesel Pumps
Emergency Power Generation
OPERATIONAL REDUNDANCY
Emergency Backpumping
Three pumps on Stock Island Diesel/Electric
Three pumps in Marathon Diesel/Electric
23 of 36 Million Gallons Storage Capacity For Backpump Operations
System Usage (Demand)
Operational Challenge“Sole Pipeline”
Pipeline Disruption
What Happens?
Scenario # 1
Land Based Pipe Failure
Pipeline ControlmanCommunicates Known Conditions
Operations Area ManagerAssesses Field Conditions
Reports To Manger of Operations:
Exact Locations of Failure
Needed Equipment, Supplies, and Personnel
Estimates Amount of Time Required for Back Pumping and to Complete Repair
Traffic Impacts
Manager of Operations
Determines:
Amount of Water Stored in Affected Area
Amount of Time Back Pumping Operation Possible
Necessity of RO Plant(s)
Operational Changes to Overall System
Operations Team Makes Repair
Occurred 11 Times In Past 5 Years
In All Cases Stored Water Supply Was Sufficient
Reverse Osmosis Plants Were Not Operated
Confident Similar Emergency Repairs Will Have Same Success Of Timely Completion
Scenario # 1 Closing Thoughts
Scenario # 2
Key Largo to Florida City Pipe Failure
Scenario #2 Plan
Build Access Pad to Leak Site Utilizing Available Contractors
Implement Water Excavation
Stock Materials Needed for Repair
Effect Repair Similar to Land Based
Highlights of Plan
Never Been Done
Availability Of Contractors
Assume Up TO 4 Days To Complete
Seawater ROs Only Water Supply
Challenges of Plan
Mandatory Water Restrictions Needed
Water Demands May Not Be Met For Days
Intermittent Or Complete Shut Down Of Some Distribution Systems/Possible Container Filling
Identify Possibility Of Expedited Repair
Develop Emergency Plan With Monroe County
Scenario # 2 Closing Thoughts
Scenario # 3
Bridge Failure
Scenario # 3 Plan
Dependent on DOT Contractor to Replace Pipe as Bridge is Replaced/Repaired
Maintain Pipe Inventory for Repair
Depend on RO Production for Supply
PIPE SIZE DUCTILE IRON STEEL
36” 194’ 40’
30” 212’ 769’
24” 446’ 516’
18” 36’ 61’
FKAA Pipe Inventory
Repairs May Require Months To Complete
Water Demands Likely Exceed Supply
Barge/Ship Mounted RO Possible (Navy)
Consider Long Term Pipeline Redundancy Plan
Additional RO Capacity
Scenario # 3 Closing Thoughts
Discussion
