Vulnerability map of the Edwards Aquifer Rami Harfouch November 2009, Austin.

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Presentation transcript:

Vulnerability map of the Edwards Aquifer Rami Harfouch November 2009, Austin

The Edwards Aquifer Alamo Village Crown and AnchorHugo Boss Outlet in San Marcos Lake Travis Gauging station at Blanco River at Wimberley

Kyle Seale Parkway in northwest Bexar county in 2008

D R A S T I C Depth of Water Recharge of the Aquifer Aquifer Media SoilTopography Vadose Zone Conductivity of the Aquifer D R A S T I C V = D. λ D + R. λ R + A. λ A + S. λ S + T. λ T + I. λ I + C. λ c λ :

Depth of Water USGS Wells Data

Drastic rating Depth of Water (m) High : 70 Low : 12

Recharge of the Aquifer TWDB data 3 Recharge zones: Outcrop (2 in/yr), downdip ( 10 in/yr) Drastic Rating 1 3 9

Aquifer Type Drastic rating 8 Assuming that the Edwards is exclusively a limestone aquifer

Soil Type STATSGOSSURGO Set of spatial and tabular data linked through a dynamic database

Soil Type TRAVIS COUNTY Bedrock SOIL TYPE Clay Clay loam Fine sand Fine sandy loam Loam Loamy fine sand Loamy sand Sandy clay Sandy loam Silty clay Silty clay loam Silty loam Very fine sandy loam (Aller et al.)

Soil Type DRASTIC rating

Topography/Slope NED  Flow direction (% drop)  Slope map

Topography/Slope DRASTIC rating

Vadose Zone DRASTIC rating Vadose Zone = Geologic Map

Conductivity of the Aquifer Since we assumed that Limestone is the only aquifer media K >> 25 m/day Drastic Rating 10

Topography Vadose Zone Recharge Conductivity Aquifer Media Depth of Water Soil Vulnerability map of the Edwards Aquifer

Vulnerability map of the Edwards Aquifer Aquifer DRASTIC INDEX – (least vulnerable aquifers) 65 < DRASTIC INDEX < 225 ( most vulnerable)

Land Use/ Land Cover Barren Land Cultivated Crops Deciduous Forest Developed, High Intensity Developed, Low Intensity Developed, Medium Intensity Developed, Open Space Emergent Herbaceuous Wetlands Evergreen Forest Hay/Pasture Herbaceuous Mixed Forest Open Water Shrub/Scrub Woody Wetlands DRASTIC rating Land use (Gomezdelcampo, 2007)

Vulnerability map + Land use = Aquifer pollution risk map Risk Index

75-80% of the Edwards recharge water comes from the rivers in the outcrop region!! Availability of the DRASTIC raw data online…for the USA Possibility to build models and automate the procedures

Questions?