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Water Quality Trends UpdateNorth Bosque River
Texas Institute for Applied Environmental Research, September 1, 2020
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– TCEQ inspection data are reviewed and drive-by assessments of CAFOs and AFOs are performed annually by TIAER
– WAFs associated with AFOs are determined to be either “Active” or “Historical” based on the AFO’s operational status
– “Active” and “Historical” status for WAFs associated with CAFOs is determined based on TCEQ permit information
Waste Application Fields
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– “Active” indicates a WAF is currently permitted to receive waste
– “Historical” indicates that a WAF no longer has waste applied due to:• Expired permit • Facility is no longer operational• Soil phosphorus limit reached• Other change in the designated use of the
field
Active vs. Historical WAFs
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Changes in Land Use 2000 WAFs
2019WAFs
Category Acres Acres ChangeActive 24,554 14,485 -41%Historical 2,142 18,659 771%Total 26,696 33,144 24%
Map represents conditions as of fall 2019
WAF = waste application field
Changes in Land Use
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Trends -Is water quality improving?
Trends
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– Routine Grab Samples for nutrients, chlorophyll-α, and TSS are collected bi-weekly
– E. coli samples are collected monthly– Storm influenced samples are collected
quarterly when possible
Sample Collection
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North Bosque Monitoring
Stations
Index Stations circled in
Red
North Bosque
Monitoring Stations
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North Bosque River Index Stations (+1)TIAER TCEQ Location Period SRP Total P
BO020 17226 Above Stephenville 1997-2019 NC D
BO040 11963 Below Stephenville 1994-2019 D D
BO070 11963* Near Hico 1993-2019 D D
BO083 18003**Near Iredell 2003-2019 NC NC
BO090 11956 Near Clifton 1996-2019 D NC
BO095 11954 Near Valley Mills 1996-2019 D NC
*Not a designated Index Station** Limited flow data at station 18003
Phosphorus Trends
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Box and Whisper Plot for the Station Below Stephenville
Flow
-Adj
uste
d ln
(PO
4-P)
, mg/
L
Water Quality Trends - BO040 below Stephenville
WWTF P removalimplemented
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Box and Whisper Plot for the Station Near Valley Mills
Flow
-Adj
uste
d ln
(PO
4-P)
, mg/
L
Water Quality Trends - BO095 near Valley Mills
I-Plan Approved
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Not entirely, but getting close
Have we met target goals?
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Normalized Runoff Volume
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Location of Valley Mills Site, 11954
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Phosphorus Levels at Station 11954, 1997-2019
North BosqueMay 29, 2015 Station
17605/11954 located near Valley Mills
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Location of Site Near Clifton, 11956
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Phosphorus Levels at Station 11956, 1997-2019
Station 11956 located near
Clifton
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Location of Site above Meridian, 11958
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Phosphorus Levels at Station 11958, 1997-2019
Station 11958/18003 located near
Iredell
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Location of Site below Stephenville, 11963
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Phosphorus Levels at Station 11963 below Stephenville, 1997-2019
Station 11963 located below
Stephenville
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Location of Site aboveStephenville, 17226
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Phosphorus Levels at Station 17226 above Stephenville, 1997-2019
Station 17226 located above
Stephenville
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The I-Plan indicates the following for determining success:
– If the monitored data curve is entirely below the model predicted TMDL-e curve, then water quality goal is being attained.
– If the monitored data curve is entirely above the predicted TMDL e-curve then the water quality goal is not being attained.
– Partial attainment occurs if the monitored data curve crosses the model predicted TMDL-e curve.
Probability Distribution Curves
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Probability Curve for Station 17226
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Probability Curve for Station 11963
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Probability Curve for Station 11958
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Probability Curve for Station 11956
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Probability Curve for Station 11954
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Yes!
Changes in treatment by
WWTFs & land management are having an impact
Is Water Quality Improving?