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Leona RiverSELECT Modeling and Potential Bacteria Sources
Texas Institute for Applied Environmental ResearchStephenville, Texas
January 24, 2013
•Lead Agency -Texas Soil & Water Conservation Board
•Support provided byNueces River Authority
Texas A&M Dept Soil & Crop Sciences & Spatial Sciences Laboratory
Acknowledgements
• SELECT (Spatially Explicit Load Enrichment Calculation Tool)
– Developed by Dept. of Biological and Agricultural Engineering and Spatial Sciences Laboratory at Texas A&M University by Dr. R. Karthikeyan, Dr. R. Srinivasan and others
Modeling Bacteria Sources
• Identifies potential bacteria loadings by subwatershed based on input data
• Spatial data, such as:– Land Use– Soils– Stream networkprovides a framework to visually representing input data and highlighting areas of potentially higher loadings
SELECT
• Population & Household Densities (Census data)
• Livestock Densities– Stakeholder Input– Agricultural Statistics (USDA) County
level data
Input Data
• Wildlife (native & exotic) – Stakeholder Input– Resource Experts (TPWD & others)
• Domestic & Feral Animals– Stakeholder Input– Resource Experts (TPWD & others)
Input Data
Source: Biological and Agricultural Engineering Department, Texas A&M University 7
Walnut Creek - Subwatersheds
Source: Biological and Agricultural Engineering Department, Texas A&M University8
Walnut Creek - Potential E. coli loads
Source: Biological and Agricultural Engineering Department, Texas A&M University9
Walnut Creek - Total Potential Daily E. coli load
• Wastewater Treatment Facilities– Uvalde– Batesville– US Fish & Wildlife Service National Fish
Hatchery
Potential Sources in the Leona
• Concentrated Animal Feeding Operations– Chaparral Cattle Feedlot (Uvalde)– Live Oak Feedlot (Batesville)
• Septage Sludge or Sewage Fields– None identified with permit review
Potential Sources in the Leona
• On-Site Sewage Facilities– What areas are on septic vs WWTF?– What kind of failures occur?– What is the “risk” of failure?
Potential Sources in the Leona
• Livestock based on County Statistics– Cattle & Calves (est. 28,000 head)– Goats (est. 6,000 head)– Sheep (est. 2,500 head)– Horses/Donkeys (est. 400 head)– Hogs (est. 100 head)
Cattle, horses/donkey & hogs spread throughout Goats & Sheep primarily in Uvalde County
Does this make sense for the watershed?
Potential Sources in the Leona
• What kinds of livestock operations primarily occur?– Cow/calf – Yearling
• What stocking rates are reasonable– For rangeland?– For improved pastureland?
Are there other types of livestock or types of operations that should be considered?
Potential Sources in the Leona
• Wildlife & Exotics– Deer – population estimates?– Exotics – population estimates?
Potential Unregulated Sources
• Feral Hogs– How large is the feral hog problem in
the Leona?– Where do the hogs primarily “hang
out”?
Potential Unregulated Sources
• Domestic Animals– Usually consider only dogs– Assume 1 dog per household
Does this make sense for the Leona watershed?
Potential Unregulated Sources
• Complete land use update with the Spatial Sciences Laboratory
• Obtain feedback on input information for SELECT
http://www.leonariver.org/
Next Steps
Contact Information
Nikki JacksonEmail: [email protected] Phone: 254.968.1920
Anne McFarlandEmail: [email protected] Phone: 254.968.9581
Questions?
Thank You
Anne McFarlandTexas Institute for Applied Environmental Research