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Water resources and hydrochemistry of the Alluvial and Sparta aquifers of the Grand Prairie region

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Information about Water resources and hydrochemistry of the Alluvial and Sparta aquifers...
Technology

Published on November 15, 2008

Author: supercooper

Source: slideshare.net

Description

My master's thesis defense presentation from April 2002, University of Arkansas Department of Geosciences
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Water resources and hydrochemistry of the Alluvial and Sparta aquifers of the Grand Prairie region Chad D. Cooper, Ralph K. Davis, Kenneth F. Steele University of Arkansas, Department of Geosciences Arkansas Water Resources Center

The Problem Multiple ground-water uses Ground-water level declines Critical Ground-Water Area as of 1998 Salinization may be related to ground-water level decline Water-quality variations resulting from lower water levels can impact all uses

Multiple ground-water uses

Ground-water level declines

Critical Ground-Water Area as of 1998

Salinization may be related to ground-water level decline

Water-quality variations resulting from lower water levels can impact all uses

Objectives Delineate spatial distribution and magnitude of varying water quality conditions as related to areas of ground-water level decline Determine areas of ground-water salinization (high in chloride, SpC, TDS) Examine varying water-quality conditions spatially over the study area Provide baseline water-quality data to water users of the region

Delineate spatial distribution and magnitude of varying water quality conditions as related to areas of ground-water level decline

Determine areas of ground-water salinization (high in chloride, SpC, TDS)

Examine varying water-quality conditions spatially over the study area

Provide baseline water-quality data to water users of the region

Physiography of Study Area Approximately 8,900 square kilometers Little to no relief Dominated by agricultural production

Approximately 8,900 square kilometers

Little to no relief

Dominated by agricultural production

1999 Land Use/Land Cover (summer)

Water level, Alluvial aquifer, spring 1998 Declines in Alluvial: 1915-1933 – up to 60 feet, Arkansas Co. 1938-1953 – from 10-20 feet 1955-1961 – from 3-10 feet 1969-1996 - 32 feet, Lonoke Co.

Declines in Alluvial:

1915-1933 – up to 60 feet, Arkansas Co.

1938-1953 – from 10-20 feet

1955-1961 – from 3-10 feet

1969-1996 - 32 feet, Lonoke Co.

Wells completed in the Alluvial aquifer About 7,000 wells!

About 7,000 wells!

Water level, Sparta aquifer, spring 1998 Declines in Sparta: 1949 – 50 feet near Pine Bluff 1958-1965 – 160 feet at Pine Bluff 1969-1999 – 70 feet+ in Arkansas Co. 1988-1999 – almost 20 feet in Lonoke Co.

Declines in Sparta:

1949 – 50 feet near Pine Bluff

1958-1965 – 160 feet at Pine Bluff

1969-1999 – 70 feet+ in Arkansas Co.

1988-1999 – almost 20 feet in Lonoke Co.

Wells completed in the Sparta aquifer About 325 wells (and rising)!

About 325 wells

(and rising)!

Sample Sites July/Aug 2000 78 Alluvial 39 Sparta 8 QA/QC Analyses at WQL of AWRC

July/Aug 2000

78 Alluvial

39 Sparta

8 QA/QC

Analyses at WQL of AWRC

Ground-water quality, Alluvial aquifer Good to acceptable Calcium-magnesium-bicarbonate type No MCL’s exceeded SMCL’s exceeded: Mn (0.05 mg/L) Fe (0.3 mg/L) Chloride: 3-172 mg/L

Good to acceptable

Calcium-magnesium-bicarbonate type

No MCL’s exceeded

SMCL’s exceeded: Mn (0.05 mg/L)

Fe (0.3 mg/L)

Chloride: 3-172 mg/L

Ground-water quality, Sparta aquifer Better Range from Ca-Na-HCO 3 type to Na-HCO 3 type No MCL’s exceeded SMCL’s exceeded: Mn (0.05 mg/L) Fe (0.3 mg/L) Chloride: 2-56 mg/L

Better

Range from Ca-Na-HCO 3 type to Na-HCO 3 type

No MCL’s exceeded

SMCL’s exceeded: Mn (0.05 mg/L)

Fe (0.3 mg/L)

Chloride: 2-56 mg/L

Salinization related to declines? Cl, Alluvial Aquifer Cl, Sparta Aquifer

Salinization related to declines? TDS, Alluvial Aquifer TDS, Sparta Aquifer

Spatial trends, Sparta aquifer GW FLOW Lonoke Jefferson Arkansas Prairie

Spatial trends, Sparta aquifer Ionic Strength Calcium Saturation

Spatial trends, Sparta aquifer Transect Location Results GW FLOW

Spatial trends, Alluvial aquifer Conductivity vs. Well Depth

Spatial trends, Alluvial aquifer Ionic Strength Calcium Saturation 37 of 78 samples saturated

Spatial trends, Alluvial aquifer pH vs. Ca Saturation pH~6.85

Spatial trends, Alluvial aquifer pH vs. Iron pH~6.85

Results and Conclusions Salinization not widespread Water quality for both aquifers: Alluvial: Acceptable, with high Cl and Fe Sparta: Better, lower Cl and Fe Varying hydrochemistry not result of ground-water level declines Varying hydrochemistry is instead result of geochemical evolution along flowpath

Salinization not widespread

Water quality for both aquifers:

Alluvial: Acceptable, with high Cl and Fe

Sparta: Better, lower Cl and Fe

Varying hydrochemistry not result of

ground-water level declines

Varying hydrochemistry is instead result of geochemical evolution along flowpath

Results and Conclusions Dominant processes: Alluvial: Ca saturation, precipitation of calcium- and iron-rich cements Sparta: Ca saturation, precipitation of calcium-rich cement; cation exchange Future work: Combine and compare with other datasets from the region Statistical analysis of spatial data Examine relationships with rivers Iron in the Alluvial aquifer?

Dominant processes:

Alluvial: Ca saturation, precipitation of calcium- and iron-rich cements

Sparta: Ca saturation, precipitation of calcium-rich cement; cation exchange

Future work:

Combine and compare with other datasets from the region

Statistical analysis of spatial data

Examine relationships with rivers

Iron in the Alluvial aquifer?

Acknowledgements Arkansas Water Resources Center (AWRC) Water Quality Lab, AWRC Arkansas Soil and Water Conservation Commission United States Geological Survey, Little Rock Arkansas Department of Environmental Quality Center for Advanced Spatial Technologies, University of Arkansas

Arkansas Water Resources Center (AWRC)

Water Quality Lab, AWRC

Arkansas Soil and Water Conservation Commission

United States Geological Survey, Little Rock

Arkansas Department of Environmental Quality

Center for Advanced Spatial Technologies, University of Arkansas

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