surface water availability. surface water considerations
TRANSCRIPT
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Surface Water Availability
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Surface Water Considerations
Physical Availability
Safe Yield
Excess Surface Water
Allocation During Time of
Shortage
Fish and Wildlife Flows
USACE Projects
Interstate Compacts
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Excess Surface Water25% of water available on an average, annual basis
above that required to meet existing/projected future needs , for non-riparian uses or interbasin transfer.
Existing/Projected Needs:1. Existing riparian rights2. Water needs of federal water projects3. Firm yield of reservoirs4. Maintenance of instream flows (Fish & Wildlife, WQ,
Navigation, and Aquifer Recharge), and5. Future needs in that basin
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Excess Surface Water Determination1990 Plan calculated excess
water for 8 areas using 19 gages 2014 Update uses 51 gages to
calculate excess water in 9 major river basins and 32 sub-basins
Updated stream flow data and demands
No change assumed if demand decreased
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Excess Water, by River Basin
River BasinExcess Water
(Million ac-ft/yr)White River (Cache)
1.7
Arkansas River 3.3Delta 1.6Ouachita River 1.0Red River 1.1
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Excess Surface Water Availability Results1990 Statewide total excess surface water ~10.5 million ac-ftUpdated Statewide total ~8.74 million ac-ftDifferences result from updated demand projections, changes in
in-stream needs (e.g., White River minimum flows), and basin differences (e.g., 1990 East Arkansas methodology)
Represents annual average, but does not reflect seasonal variations
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US Army Corps of Engineers (USACE) Projects
Arkansas Water Plan (AWP) references the annual summary of USACE projects
Current allocation status for each reservoir
Summary of general process required for reallocation
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Interstate CompactsCompact delivery
requirements limit available surface water
Arkansas River Compact (AR and OK)
Red River Compact (OK, TX, AR and LA) – includes all areas south of the Arkansas River watershed
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Fish and Wildlife Flows
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Fish and Wildlife Flows Subgroup formedTechnical workshop – March 2013
Reviewed the Arkansas Method, Modified Tennant Method
Reviewed national and southeastern methods for estimating instream flows
Recommended path forward
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RecommendationsUse the Arkansas Method for estimating fish and wildlife
flows and updating excess flow estimates for the 2014 Arkansas Water Plan
Determine flow-ecology relationships and develop an empirical, risk-based method for estimating flow-ecology (e.g., fishery) relationships, based on:MagnitudeFrequencyDurationTiming, andRate of change of flow
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Recommendations (Continued)Framework for adopting alternative methods for F&W flows
into Arkansas Water Plan (i.e., adaptive management), which requires:
1. Defining how flows were determined (e.g., USGS gauge) 2. Specifying the applicable stream classes (e.g. extraordinary
resource waters)3. Documenting the current hydrologic status 4. Confirming the flow-ecology relationships are scientifically
defensible5. Documenting the stakeholder process used to refine, if needed,
flows to achieve all designated uses6. Monitoring and periodically assessing flow-ecology relations
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Recommendations (Continued)
Propose approaches for reducing the likelihood of declared water shortages and stopping withdrawals
For Illustration Only
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Surface Water Quality
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Information SourcesState-wide information sources
ADEQUSGS
Updated information since 1990 PlanSelected sources within water resources planning
regions Beaver Water District Ft. SmithCentral Arkansas WaterANRCAR Department of Health
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AnalysesUsed existing results for current status
305(b) reports303(d) lists
Demand water use sectorsSummary by AR WR Planning RegionsWQ Trend analyses at concurrent water supply sitesFlow-adjusted Seasonal Kendall trend analysesIssues: since 1990 Plan and emerging
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Current (2008) Water Quality:Impaired Stream Miles, Lake Acreage
Designated useWater Demand Sector
Use
Impaired Stream Miles/% of Total
Assessed
Impaired Lake Acres/% of Total
Assessed
Fish Consumption Recreation 363.3/3% 23,637/6%
Aquatic Life Fish & Wildlife 2,439.9/25% 11,248/3%
Primary Contact Recreation 564.8/6% 0
Secondary Contact Recreation 7/0.01% 0
Domestic Water Supply Drinking Water 448.3/4% 97,105/27%
Ag & Industrial Water Supply Agriculture, Industry 967.7/10% 0
Total miles (acres) impaired 4,086.5/41% 127,520/36%
Total miles (acres) assessed 9,849.7 357,896
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Causes of Impairment (2008)Causes Stream Miles Lake Acres
Siltation/Turbidity 1,156.3 3,235Organic Enrichment/
Low DO/Nutrients 1,308 4,625
Mercury 319 18,677
Priority Organics 44.8 <10E. coli 638.8
Chlorides 691.7
Sulfates 511
Total Dissolved Solids 1,021.7
Beryllium 97,105
Copper 335
Unknown 30,485
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Water Quality Change/Trend Stations
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Parameters Analyzed*
DOInorganic NTKNTotal P
TurbidityTSSFecal Coliforms
*Parameters analyzed primarily related to aquatic life use
Fecal coliforms related to recreational use
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Results of Q-adjusted Seasonal KendallNorth Planning Region
Stream NameWater Quality Trends
DO Inorganic N TKN Total Phosphorus Turbidity TSS
Kings River None None None None
Black River < 30 yrs None None
Strawberry River None None < 30 yrs None
Middle Fork Little Red R. < 30 yrs None
Illinois River <30 yrs <30 yrs < 30 yrs
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Overall Surface Water Quality SummaryAssessed streams (59%) and lakes (64%) attained
uses No statewide patterns of use impairment or causes,
except fish consumption (mercury) since 1990Declining trends in suspended solids across most
water resources planning regionsPotential emerging concern – trace organics known
as CECs
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How to Follow the Arkansas Water Planning Process and Get More InformationVisit the Water Plan Website at:
ARWaterPlan.Arkansas.govSend an e-mail to:
[email protected] us your address and we
will send periodic updatesVisit the ANRC website to follow
Commission activities
anrc.arkansas.gov/
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