1. Little River Ditches Watershed Monitoring Project 11-2000S
Jennifer L. Bouldin, PhD
Ecotoxicology Research Facility
Arkansas State University

2. arkansaswater.org

3. Little River Ditches Shared with MO and KY ~ 25% in AR
Intensive row crop agriculture

4. Land Use
81.4% cropland
11% forested
arkansaswater.org

5. MRBI sampling ISCO sampler set for runoff events
24 ISCO containers analyzed individually
Total solids (g/time)

6. Measured Parameters pH Dissolved Oxygen Total Suspended Solids (TSS)
Turbidity
Dissolved Nitrate, Nitrite, Orthophosphate
Total Nitrogen, Total Phosphorus

7. Ditch Number 4-Buffalo Creek Ditch Number 56
HUC#
Ditch Number 56
HUC#

9. Site 1
2415
2164
1714
1242

10. Site 2
1078
2340
1626
2520
1420

11. Site 3
2451
1586
1248

12. Site 4
2457
1686
2052

14. Site 5
7.5
4430
3280
1796
1746

15. Site 7
6.7
5.2
1510
4590
1702
3640
2200

16. Preliminary results
High flow vs. low/no flow conditions vary nutrient and TSS values
Sediment and nutrients values much higher in primary ditches
More TSS spikes in 2013 due to rainfall
Comparison of edge-of-field data to instream data will determine direct input from field

17. Thanks to ANRC, Kyle Cassidy, students and technicians at Ecotox
Questions?
Thanks to ANRC, Kyle Cassidy, students and technicians at Ecotox