UA Division of Agriculture Arkansas Water Resources Center.

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Presentation transcript:

UA Division of Agriculture Arkansas Water Resources Center

 Volunteer monitors were trained by AWRC personnel at their site(s) during September to collect and handle water samples.  Single point grab samples were collected during base flow conditions during September and December 2008 and March and May  For continuity in sampling, water samples were collected by AWRC or IRWP if volunteers were unavailable during a specific month.

UA Division of Agriculture Arkansas Water Resources Center  Water samples were delivered to the AWRC WQL for analysis within 1 business day by trained volunteers.  Samples were analyzed for:  NO 3 -N  SRP  TN  We prioritized the HUC-12 based on geomean constituent concentrations for TN, TP, NO 3 -N and SRP  Sub-watershed sites were divided into approximately 3 equal groups of high, medium and low priority rankings (following Parker et al., 1996)  TP  TSS  Cl  F  Turbidity  Conductivity

UA Division of Agriculture Arkansas Water Resources Center  Parker et al. (1996) sampled these same 37 sites from during base flow conditions and storm events.  They determined discharge at each site, combined it with concentration data and calculated unit area loads for each site.  Parker et al. (1996) prioritized sub-watershed sites based on the calculated unit area loads.  For comparison, we could only use the base flow concentrations measured by Parker et al. (1996).  We re-prioritized the historical sites based on base flow concentrations only following the same method (i.e., 3 ~ equal groups of high, medium and low priority rankings).

UA Division of Agriculture Arkansas Water Resources Center  TP ranged from mg L -1  >50% as SRP  Highest concentrations downstream of WWTPs  Greatest changes between studies at sites downstream of WWTPs

UA Division of Agriculture Arkansas Water Resources Center  TN ranged from mg L -1  ~80% as NO 3 -N  TN decreased at 5 sites and only increased at 1 site  NO3-N increased at 14% of sites

UA Division of Agriculture Arkansas Water Resources Center Following the method of Parker et al. (1996) for TP: 11 High Priority Sites 10 Medium Priority Sites 16 Low Priority Sites

UA Division of Agriculture Arkansas Water Resources Center Which sites shifted to a High Priority? Site 3: Goose Creek Site 19: Muddy Fork Site 21: Lower Moores Site 32: Cincinnati Site 2: Ruby Site 23: Kinion Site 8: Robinson For TP, 46% of sites changed priority rankings between the historical study and the current study.

UA Division of Agriculture Arkansas Water Resources Center Which sites shifted from a High to a Low Priority? Site 13: Galey Site 10: Brush Site 9: Wildcat Site 15: Little Osage Site 18: Puppy For TP, 46% of sites changed priority rankings between the historical study and the current study.

UA Division of Agriculture Arkansas Water Resources Center For TP, 46% of sites changed priority rankings between the historical study and the current study. UA Division of Agriculture Arkansas Water Resources Center Following the method of Parker et al. (1996) for TN: 10 High Priority Sites 19 Medium Priority Sites 8 Low Priority Sites

UA Division of Agriculture Arkansas Water Resources Center Which sites shifted to a High Priority? Site 3: Goose Creek Site 33: Wedington But, no sites shifted from a high to a low priority. For TN, 46% of sites also changed priority rankings between the historical study and the current study.

 Use the same breakpoints defined by Parker et al. (1996)?  Increase the number of highs and lows  Consider whether concentrations significantly increased or decreased?  1:1 graphs  What about considering the gradient between nutrients and catchment land use? UA Division of Agriculture Arkansas Water Resources Center

R 2 = 0.11 P=0.045 R 2 = 0.38 P<

UA Division of Agriculture Arkansas Water Resources Center Data points over here are higher than average. Data points down here are lower than average.

 We successfully used trained volunteers to collect water samples at 37 sites in the UIRW to establish current water quality conditions.  Between the studies, base flow constituent concentrations were significantly different at some sites.  The priority rankings were updated based on the current water quality conditions following the method of Parker et al. (1996).  A different prioritization method may be more beneficial to effectively target priority sub-watersheds in the UIRW. UA Division of Agriculture Arkansas Water Resources Center

 The data collected during this study is valuable, because data is not widely available in the smaller sub-watersheds across the UIRW.  This data was used to assist in the prioritization of the HUC 12s across the larger watershed during WMP development. UA Division of Agriculture Arkansas Water Resources Center