equus beds asr program – wichita’s future water supply
DESCRIPTION
Equus Beds ASR Program – Wichita’s Future Water Supply. September 6, 2012. Wichita Public Works & Utilities. 186 mi 2 Service Area 425,000+ Served 128,905 Residential Customers 13,291 Commercial Customers 160 MGD Lime Softening Plant Average Day Demand 60 MGD. - PowerPoint PPT PresentationTRANSCRIPT
Equus Beds ASR Program – Equus Beds ASR Program – Wichita’s Future Water SupplyWichita’s Future Water SupplyEquus Beds ASR Program – Equus Beds ASR Program – Wichita’s Future Water SupplyWichita’s Future Water Supply
September 6, 2012September 6, 2012
Wichita Public Works & UtilitiesWichita Public Works & Utilities
186 mi2 Service Area 425,000+ Served
128,905 Residential Customers 13,291 Commercial Customers
160 MGD Lime Softening Plant Average Day Demand 60 MGD
186 mi2 Service Area 425,000+ Served
128,905 Residential Customers 13,291 Commercial Customers
160 MGD Lime Softening Plant Average Day Demand 60 MGD
Wichita Water Utilities Sources of WaterWichita Water Utilities Sources of Water
Wichita Well Field
Little Arkansas River
Arkansas River
Cheney Reservoir
Burrton
Bentley Reserve
Well Field
Wichita
Local Well Field
Cheney Reservoir – 1965
80MGD
Equus Beds Well Field – 1940s+55 Wells – 78 MGD
Bentley Well Field6 Wells – 10 MGD
Local Well Field19 Wells – 34 MGD
Equus Beds AquiferEquus Beds Aquifer
1,400 square miles 4 Counties 2,000 Non-Domestic Water Wells 157,000 acre-feet Withdrawn Annually
1,400 square miles 4 Counties 2,000 Non-Domestic Water Wells 157,000 acre-feet Withdrawn Annually
Projected Water Supply DemandsProjected Water Supply Demands
Average Day Demand Projections
Peak Day Demand Projections
Average Day Capacity
Max Day Capacity
2000 2005 2010 2015 2020 2025 2030 2035 2040 2045 2050
YEAR
0
50
100
150
200
250
Mill
ion
Gal
lons
per
Day
Demand 1992 2050
Average Day 60 MGD 112 MGD
Max Day 125 MGD 225 MGD
Integrated Local Water Supply Plan (ILWS Plan)Integrated Local Water Supply Plan (ILWS Plan)
Approved 1993 Meet 2050 Water Demands
Principle Component 100 MGD ASR Program
Approved 1993 Meet 2050 Water Demands
Principle Component 100 MGD ASR Program
Equus Beds – Water Level DeclineEquus Beds – Water Level Decline
Since 1940 agricultural and municipal pumping created a depression
65 billion gallons available for storage (to return to 1940 water levels)
Since 1940 agricultural and municipal pumping created a depression
65 billion gallons available for storage (to return to 1940 water levels)
More than 30 feet of water-level decline since 1940
Equus Beds – Chloride MigrationEquus Beds – Chloride Migration
Studies demonstrate chloride will migrate into the well field by 2050
Chlorides will exceed 250 ppm
Studies demonstrate chloride will migrate into the well field by 2050
Chlorides will exceed 250 ppm
Decline in Storage VolumeDecline in Storage Volume
ASR A Win-Win ProjectASR A Win-Win Project
Reliable & Sustainable Water Supply Source through 2050
Water Quality Protected from Salt Water Contamination
No Requirements to Curtail Irrigation Irrigators Have Lower Pumping Costs Improves Low Flows in Little Ark. River Less Land Required
Reliable & Sustainable Water Supply Source through 2050
Water Quality Protected from Salt Water Contamination
No Requirements to Curtail Irrigation Irrigators Have Lower Pumping Costs Improves Low Flows in Little Ark. River Less Land Required
Challenges to ASR ProjectChallenges to ASR Project
1st ASR Project in Kansas No Regulations in Place to Administer No Proof that Water can be Diverted
from River by Wells No Regulations in Place to Administer
Bank Storage Wells No Documentation that ASR would not
Contaminate Shared Aquifer Poor Image of City in Project Area
1st ASR Project in Kansas No Regulations in Place to Administer No Proof that Water can be Diverted
from River by Wells No Regulations in Place to Administer
Bank Storage Wells No Documentation that ASR would not
Contaminate Shared Aquifer Poor Image of City in Project Area
Scale of ASR ProgramScale of ASR Program
Ultimate Capacity to Recharge & Recover 100 MGD
80 mi2 area Recharge Facilities at Build-out
97 ASR Wells 2 Recharge Basins
ASR Wells Average Depth ~ 200 ft Average Injection Rate ~ 1 MGD
134 Monitoring Wells
Ultimate Capacity to Recharge & Recover 100 MGD
80 mi2 area Recharge Facilities at Build-out
97 ASR Wells 2 Recharge Basins
ASR Wells Average Depth ~ 200 ft Average Injection Rate ~ 1 MGD
134 Monitoring Wells
Source of Recharge WaterSource of Recharge Water
Little Arkansas River High Turbidity
Varies from 8 - 2000 NTUs High Atrazine Concentration
Varies from >1 – 50 g/L
Little Arkansas River High Turbidity
Varies from 8 - 2000 NTUs High Atrazine Concentration
Varies from >1 – 50 g/L
Surface Water can only be diverted at Above Base Flow Conditions
Expect to Recharge 120 days/year Spring & Early Fall
Surface Water can only be diverted at Above Base Flow Conditions
Expect to Recharge 120 days/year Spring & Early Fall
Typical Storm EventTypical Storm Event
Minimum Flowrate for Diversion
ASR Program SchematicASR Program Schematic
Recharge BasinRecharge Basin
Area 4.5 acres
Recharge Rate ~ 1.5 in/day
Area 4.5 acres
Recharge Rate ~ 1.5 in/day
Typical ASR Recharge WellTypical ASR Recharge Well
Recharge Tubes (3-4 per well)
ASR Phase IASR Phase I Location selected to prevent migration of
chlorides into the Equus Beds Constructed to establish a hydraulic barrier
Location selected to prevent migration of chlorides into the Equus Beds
Constructed to establish a hydraulic barrier
Phase I
City Wells
Phase I
City Wells
ASR Phase IASR Phase I
Recharge & Recovery Capacity of 10 MGD
ASR Facilities 7 MGD River Intake SWTP (7 MGD) 15 miles of pipeline 3 Diversion Wells 4 ASR Wells 2 Recharge Basins
Recharge & Recovery Capacity of 10 MGD
ASR Facilities 7 MGD River Intake SWTP (7 MGD) 15 miles of pipeline 3 Diversion Wells 4 ASR Wells 2 Recharge Basins
ASR Phase IASR Phase I
Award Winning Project Has established the hydraulic barrier
Award Winning Project Has established the hydraulic barrier
ASR Phase IIASR Phase II
Recharge & Recovery Capacity of 30 MGD ASR Facilities
River Intake (60 MGD, Equipped for 30 MGD) SWTP (30 MGD) 31 ASR Wells Recharge Basin (~ 7 MGD) 31 miles of Pipelines
Vital Statistics 950 Sheets of Design 43 Permits Obtained 51 Easements Acquired
Recharge & Recovery Capacity of 30 MGD ASR Facilities
River Intake (60 MGD, Equipped for 30 MGD) SWTP (30 MGD) 31 ASR Wells Recharge Basin (~ 7 MGD) 31 miles of Pipelines
Vital Statistics 950 Sheets of Design 43 Permits Obtained 51 Easements Acquired
ASR Phase IIASR Phase II
ASR Phase II SWTP Treatment Process Pre-Sedimentation & Ultrafiltration
Membranes to remove suspended solids Advanced Oxidation Processes (AOP) for
Virus Inactivation & Destruction of Atrazine (and other pesticides)
ASR Phase II SWTP Treatment Process Pre-Sedimentation & Ultrafiltration
Membranes to remove suspended solids Advanced Oxidation Processes (AOP) for
Virus Inactivation & Destruction of Atrazine (and other pesticides)
Intake Site
Intake Structure Model 1:5 Scale
Intake Structure Model 1:5 Scale
ASR Phase II SWTPASR Phase II SWTP
Regulatory ControlsRegulatory Controls First ASR project in Kansas – NO regulations
existed to administer Project includes restrictions on flow
conditions in the river. Class V permit from KDHE controls water
quality to wells and basins. Establishment of index well network. Installation of numerous monitoring wells
near diversion wells and recharge sites.
First ASR project in Kansas – NO regulations existed to administer
Project includes restrictions on flow conditions in the river.
Class V permit from KDHE controls water quality to wells and basins.
Establishment of index well network. Installation of numerous monitoring wells
near diversion wells and recharge sites.
Diversion WellsDiversion Wells
Appropriations require at least 56 cfs in the river during irrigation season
Drawdown less than 10 feet 660 feet from well
Recovery to regional water level in less than 7 days
No impairment to other groundwater users
Appropriations require at least 56 cfs in the river during irrigation season
Drawdown less than 10 feet 660 feet from well
Recovery to regional water level in less than 7 days
No impairment to other groundwater users
ASR Phase II – Geochemical EvaluationASR Phase II – Geochemical Evaluation Evaluate Mixing of Surface Water,
Groundwater and Equus Beds Aquifer Matrix
Preliminary Predictions: Pyrite (if present) within the aquifer matrix,
may oxidize releasing arsenic Iron will also precipitate and form a rust
coating on matrix Arsenic is absorbed onto rust
Evaluate Mixing of Surface Water, Groundwater and Equus Beds Aquifer Matrix
Preliminary Predictions: Pyrite (if present) within the aquifer matrix,
may oxidize releasing arsenic Iron will also precipitate and form a rust
coating on matrix Arsenic is absorbed onto rust
ASR Phase II – Geochemical Evaluation: Pilot StudyASR Phase II – Geochemical Evaluation: Pilot Study
Filters
Recharge QuantityRecharge Quantity 2006 – No recharge because of low flows in river. 2007- 369 million gallons recharged. 2008 – 319 million gallons recharged 2009 – 170 million gallons recharged 2010 – 89 million gallons recharged 2011 – No recharge – low flow and construction
issues 2012 – 33 million recharged to date
To date – 978 million gallons (over 3,000 AF) has been recharged.
2006 – No recharge because of low flows in river. 2007- 369 million gallons recharged. 2008 – 319 million gallons recharged 2009 – 170 million gallons recharged 2010 – 89 million gallons recharged 2011 – No recharge – low flow and construction
issues 2012 – 33 million recharged to date
To date – 978 million gallons (over 3,000 AF) has been recharged.
ASR Phases III & IVASR Phases III & IV Recharge & Recovery Capacity of 60
MGD ASR Facilities
To Be Determined Likely to consist of Diversion Wells and/or
additional diversion capacity at Phase II River Intake
Possible expansion of Phase II SWTP
Recharge & Recovery Capacity of 60 MGD
ASR Facilities To Be Determined Likely to consist of Diversion Wells and/or
additional diversion capacity at Phase II River Intake
Possible expansion of Phase II SWTP
Questions?Questions?