Groundwater Quality of the Houston AreaBrett BuffMay 7, 2009

Project Location

Volume of Brackish Groundwater in Houston AreaTDS between 1,000 and 10,000

mg/l85 million acre-feetSlightly saline -1,000 to 3,000

mg/l60 million acre-feetModerately saline – 3,000 to

10,000 mg/l25 million acre-feet

Background+ 7,000 wells analyzedTWDB DatabaseTotal Dissolved SolidsGroundwater ElevationDepth of Groundwater from the

SurfaceRelationship between

Groundwater Quality vs. Depth From Surface and Elevation of Groundwater Table

TDS (mg/L) of Wells

Depth to Groundwater Trend Analysis

Elevation of Groundwater Trend Analysis

Depth to Groundwater

Elevation of Groundwater

Total Dissolved Solids of Groundwater

GW Elevation vs. TDS Concentration

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

-800

-600

-400

-200

0

200

400

f(x) = 0.0360464588817408 x − 95.0363143134789R² = 0.0135518517430399

TDS (mg/L)

Ele

va

tio

n (

fee

t)

Depth to GW from Land Surface Elevation vs. TDS Concentration

0 500 1000 1500 2000 2500 3000 3500 4000 4500 50000

100

200

300

400

500

600

700

800

f(x) = − 0.0855478981073329 x + 193.688564479267R² = 0.0892906836622555

TDS (mg/L)

De

pth

fro

m L

SE (

fee

t)

Descriptive Statistics

Any Questions ???