Brian Haggard Arkansas Water Resources Center UA Division of
Agriculture Arkansas Water Resources Center
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To support modeling efforts in basins with little water quality
information. 1. Monitoring sites with USGS gages to estimate
nutrient and sediment loads. 2. Monitoring HUC-12 outlets to better
understand how water quality changes across sub-watersheds draining
different land uses UA Division of Agriculture Arkansas Water
Resources Center
UA Division of Agriculture Arkansas Water Resources Center
Strawberry Watershed (HUC 11010012) USGS 07074000
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UA Division of Agriculture Arkansas Water Resources Center
Upper Saline Watershed (HUC 0804203) USGS 07362587 USGS 07363000
USGS 07363200 USGS 07363400
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Water samples were collected once a month during base flow
conditions. Samples were collected from a single vertical point in
the stream Rising, peak and falling flows were targeted during each
storm events.
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Stage recorded in 30 minute intervals by USGS to estimate
discharge. Water samples were analyzed at the AWRC WQL for: Soluble
Reactive P Total P Nitrate-N Total N Total Suspended Solids
Conductivity Turbidity
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Linear regression will be used to determine the relationship
between daily load and daily flow: ln(L d ) = o + 1 ln(Q d ) or
ln(L d ) = o + 1 ln(Q d ) + 2 sin(2T) + 3 cos(2T) BCF will be used
to remove bias from log transformations:
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UA Division of Agriculture Arkansas Water Resources Center
Sampling began in October 2011. Monthly base flow and several storm
events were collected through project year (June 2012). USGS
07247000 USGS 07249400 9 Base flow & 11 Storm event
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UA Division of Agriculture Arkansas Water Resources Center USGS
07074000 Sampling began in October 2011. Monthly base flow and
several storm events were collected through project year (June
2012). 9 Base flow & 9 Storm event
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UA Division of Agriculture Arkansas Water Resources Center USGS
07362587 USGS 07363000 USGS 07363200 USGS 07363400 Sampling began
in October 2011. Monthly base flow and several storm events were
collected through project year (June 2012). 9 Base flow & 5
Storm event 9 Base flow & 8 Storm event 9 Base flow & 7
Storm event
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UA Division of Agriculture Arkansas Water Resources Center
Sampling Limitations: Less rainfall in 2012. Proximity of
locations. Weve missed a few storms because we didnt know it was
going to rain in other parts of the state!
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UA Division of Agriculture Arkansas Water Resources Center Low
High LAND USE %Pasture and Urban Phosphorus Concentration Low High
LAND USE % Forest Phosphorus Concentration Low High We can use HUC
12 data to compare measured concentrations to land use.
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UA Division of Agriculture Arkansas Water Resources Center
Specific HUCs where management actions can be focused. Upper
Illinois River Watershed
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UA Division of Agriculture Arkansas Water Resources Center
MonitoringModeling
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UA Division of Agriculture Arkansas Water Resources Center
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To improve the health of the Mississippi River Basin, including
water quality and wildlife habitat, the USDA and its partners will
help producers in selected watersheds in the Mississippi River
Basin voluntarily implement conservation practices and systems that
avoid, control, and trap nutrient runoff; improve wildlife habitat;
and maintain agricultural productivity.
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UA Division of Agriculture Arkansas Water Resources Center