managed aquifer recharge (mar) -- beyond the asr well a ...managed aquifer recharge (mar) -- beyond...
TRANSCRIPT
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Managed Aquifer Recharge (MAR) -- Beyond the ASR Well
Stephanie J. Moore, P.G. Daniel B. Stephens & Associates, Inc.
a GeoLogic Company
TAGD Groundwater SummitAustin, Texas
August 28-30, 2018
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Daniel B. Stephens & Associates, Inc.
MAR techniques range from low to high tech
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Daniel B. Stephens & Associates, Inc.
Aquifer Storage and Recovery
ASR is just one part of MAR
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Daniel B. Stephens & Associates, Inc.
Outline• Overview of Managed Aquifer Recharge
– Definitions: MAR, ASR, ASTR, VZ
– Technical considerations
• Regulatory environments– Highly variable by state
• Types of MAR projects
• Intersection with LID/Stormwater Mgmnt.
• ASCE Guidelines for MAR
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Daniel B. Stephens & Associates, Inc.
Managed Aquifer Recharge
• The practice of increasing, by artificial means, the amount of water that enters a groundwater reservoir.
• A water resources management tool that allows for the efficient and conjunctive management of surface water, groundwater, and reclaimed water sources.
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Daniel B. Stephens & Associates, Inc.
Common MAR Goals• Water supply management
– Seasonal storage– Long-term storage– Emergency supply– Conjunctive use
• Aquifer restoration– Restore water levels– Support baseflow– Reduce subsidence– Mitigate saltwater intrusion
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Daniel B. Stephens & Associates, Inc.
Source: Dillon, et al., 2009
Many forms of MAR
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Daniel B. Stephens & Associates, Inc.
MAR -- Not a silver bullet but depends on site specific conditions
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Daniel B. Stephens & Associates, Inc.
Three Basic Pieces of MAR• Water source
• Delivery mechanism
• Recovery mechanism
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Daniel B. Stephens & Associates, Inc.
Regulatory Environment in SW• Highly variable between and within States
• At least two regulatory agencies: – Water quality
– Water rights
• Balancing act– Water supply and management
– Environmental protection
• Drivers– Public perception, science, regs, past experience
* Gross generalizations
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Daniel B. Stephens & Associates, Inc.
Regulatory Environment by State• Early adopters
– Florida (ASR only)
– California (Infiltration and ASR)
• Quick to catch on– Arizona
– Colorado
– Nevada
– El Paso, some West Texas
• Warming up to the idea– New Mexico
– Texas
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Daniel B. Stephens & Associates, Inc.
MAR in other States• Florida
– Early implementation of MAR
– Primarily ASR dual-purpose wells
• California– More than 65 water agencies in the state operate
groundwater recharge programs and MAR is an integral component of the State Water Plan
– Flood MAR Program
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Daniel B. Stephens & Associates, Inc.
MAR in other States• Arizona
– 1980s: Demonstration projects in Tucson, Scottsdale, and Phoenix
– As of March 30, 2017, the Department of Water Resources reports 189 long-term storage accounts in the state
– 28 of the accounts have total recoverable balances of > 100,000 acre-feet
– Maximum total recoverable balance ~ 1,700,000 acre-feet (AWBA Main, Phoenix AMA)
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Daniel B. Stephens & Associates, Inc.
MAR in other States• Colorado
– In 2004, there were more than 150 active aquifer storage and recovery projects in the state
• New Mexico– Recent evolution of regs, permitting, projects
• Texas– Early application, mid 1950s in West Texas
– Current interest in (primarily) ASR
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Traditional MAR Methods
Spreading Basin
ASR
Vadose Zone Well
HyrdroSystems, Inc., Phoenix , AZ
Streambed Infiltration
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Daniel B. Stephens & Associates, Inc.
What You Can Expect
Recharge Technology Capacity Range
Recharge basins 0.2 - 10 feet per day
Vadose zone wells 200 - 600 gpm
ASR wells 200 - 2,000 gpm
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Daniel B. Stephens & Associates, Inc.
Aquifer Storage and Recovery
ASR Wells• Dual purpose wells for
injection/extraction• Excellent source water
quality• Low space• High energy• Short term/seasonal
storage cycle • Non-potable aquifer
for storage• Well confined aquifer
to maintain bubble• Optimization of
injection and recovery efficiency
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Daniel B. Stephens & Associates, Inc.
Rio Rancho ASR
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Daniel B. Stephens & Associates, Inc.
Aquifer Storage, Transfer, Recovery (ASTR)
• Separate injection and recovery wells• Excellent source water quality• Low space, high energy• Long term storage is possible• Target aquifer is potable• Optimization of injection and recovery efficiency
ASTR is more
flexible than ASR
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Daniel B. Stephens & Associates, Inc.
Vadose Zone Wells and Trenches
• Shallow subsurface• Variable source water quality• Soil Aquifer Treatment (SAT)• Short term or long term
storage• 5-10 year life span
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Daniel B. Stephens & Associates, Inc.Porous gravels
Lytle Creek flood water
Redwood lumber~4’ x 6’ x (8” or 10”)
3/4” spacing
Boulder-formedsettling basin
Shaft inlet
“Shaft” Method of Groundwater Recharge(1912)
50 to 70’ bgs
• Recharge rate = 1-2 ft3/sec
Source: William Richardson, Conservation Commission of the State of California, 1912
Silts
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Daniel B. Stephens & Associates, Inc.
Mariposa WRF - SurfaceInfiltration Gallery Construction
• A single 10-inch distribution manifold feeds system
• Polyethylene chambers installed within 37 rows
• 2-acre footprint
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Underground Infiltration Basins
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Daniel B. Stephens & Associates, Inc.
Surface Recharge• Suitable soils• Variable source water quality• Soil Aquifer Treatment (SAT)• Short term or long term
storage• Longer life span• Large surface area • Lower energy requirements
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Daniel B. Stephens & Associates, Inc.
The Early Years
• 1896: Small scale spreading from Santiago Creek
• Irvine Ranch Company
• Perhaps the first for intentional storage
• OCWD still has one nearby
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Daniel B. Stephens & Associates, Inc.
The Early Years• 1901: Small scale spreading on debris cone of San
Antonio Creek near Claremont
• Water companiesin Pomona, CA
• 1915: Pomona Valley Protective Association constructed weir at mouth of canyon to divert water to spreading grounds
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Daniel B. Stephens & Associates, Inc.
Montebellow Forebay Spreading Grounds - 1930s
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Daniel B. Stephens & Associates, Inc.
Source: www.ci.tucson.az.us/water/docs/waterplan, pg 4-8.
Central AZ Project-AZ: 2.8 MAFY-Tucson: 0.135 MAFY-1995 vote prevents direct use-CAVSRP started 2001
60,000 AFY300 AC Basins27 Recovery WellsNative Water BlendTreated
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Daniel B. Stephens & Associates, Inc.
MAR for Rainwater Harvesting, Capturing Flood Flow, Supporting Baseflow
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Daniel B. Stephens & Associates, Inc.
Urbanization: Increases RODecreases ETDecreases R
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Daniel B. Stephens & Associates, Inc.
Rainfall-Runoff Response
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Capture Evapotranspiration (ET) and Restore Runoff (RO) for Improved Sustainability: Baseline Condition
ET = 12”
Precipitation (P) = 20”
Native vegetation
Vadosezone
Recharge(R) = 4”
Groundwater
Infiltration (I)I I
RO = 4”
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Choose Infiltration-Based LID Methods (not ET-Based)
Groundwater
RO = 4”
ET = 10”
Infiltrationbasin
Permeablepavement
DP IDP
R = 6”
I
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Harvest Roof Water, Recharge the Excess
Impairedwater
Infiltration structure
Pumpingwell
Naturally treated and stored roof water
Soil treatmentzone
Storagetank
Roof watercollection
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Daniel B. Stephens & Associates, Inc.
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Daniel B. Stephens & Associates, Inc.
Cochise County Recharge Network
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Daniel B. Stephens & Associates, Inc.
ASCE Guidelines for MAR
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Daniel B. Stephens & Associates, Inc.
New ASCE Guidelines Coming Soon
American Society of Civil Engineers (ASCE) Committee on Managed Aquifer Recharge
- Revising old Standards
- Publishing new Guidelines
- Out for public comment soon
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IMPLEMENTATIONPHASES
PLANNING AND EVALUATION WORK ITEMS
I : PLANNING & EVALUATION
(Section 4)
II: DESIGN(Section 5)
III: CONSTRUCTION
(Section 6)
IV: OPERATION & MANTENANCE
(Section 7)
FIGURE 4.1. Details of the Planning & Evaluation Phase Leading to Design, Construction, and Operation of a MAR Project. Numbers refer to sections in the text.
4.1 INITIAL PROJECT SCOPING Define MAR Objectives Develop Conceptual Plan
4.2 INITIAL PLANNING: DATA EVALUATION Develop Evaluation Criteria Evaluate Water Sources And Demand Evaluate Site Hydrogeology Criteria Evaluate Environmental Criteria Evaluate Implementation Criteria Evaluate Regulatory Criteria
4.3 DETAILED PLANNING: ID POTENTIAL SITES Initial Site Screening Detailed Evaluation Select Sites For Feasibility Studies Public Participation Documentation
V: CLOSURE(Section 8)
DA
TA C
OLL
ECTI
ON
AN
D A
NA
LYSI
S (S
ectio
n 9)
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Stephanie J. Moore, P.G.August 29, 2018
Thank you!
Texas Groundwater Summit