Groundwater Supply ◦ Quantity ◦ Quality Infrastructure ◦ Treatment ◦ Transmission ◦...

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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

SUPPLY AND DEMANDAvailable Water Supply (2006 -2030)

Floridan Blend and Bypass (mgd)

Reclaimed Water

Reverse-Osmosis WTP (mgd)

Biscayne Aquifer (mgd)

SUPPLY AND DEMANDWater Demand Projections - 2005

Reclaimed Water

2005 Avg Day Projections thru 2026

SUPPLY AND DEMANDWater Demand Projections -

Current

Reclaimed Water

Adjusted 2013 Avg. Day Projections

2005 Avg Day Projections thru 2026

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

Water Supply and Treatment

2 MGD Emergency Seawater Desalination Stock Island(Diesel)

1 MGD Emergency Seawater Desalination Marathon (Diesel)

Transmission Pipeline Pumping Capability

Four Booster Pump Stations

Electric and Diesel Pumps

Emergency Power Generation

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 # 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

Discussion

Groundwater Supply ◦ Quantity ◦ Quality Infrastructure ◦ Treatment ◦ Transmission ◦...

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