Layer: Fort Cobb Lake OK (ID:13)

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Name: Fort Cobb Lake OK

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Description: RESEARCH OBJECTIVES:The overall goal is to develop better understanding of the integrated effects of land use, land management (including conservation practices) and climate variations on hydrologic processes at watershed to regional scales. The Southern Great Plains is subject to recurring climate extremes, particularly drought, which slows economic growth mainly due to limited and unreliable water supplies. Specific: · Quantify water quality and quantity, and soil quality effects of conservation practices across field to watershed scales within the upper Washita River watershed. · Quantify accuracy and uncertainty in model output across field to watershed scales and incorporate this information into assessment tools.APPROACHES:World-class instrumented watershed facilities, state-of-the-art simulation models, field studies, and remotely sensed data are utilized in this project. Hydrologic data collected between 1961-1985 from various sub-watersheds of the Upper Washita River Hydrologic Unit are available for model calibration. Substantial monitoring of climate and streamflow is supported by ARS, the Oklahoma Mesonet, and USGS in the FCREW. Extensive monitoring was conducted from 2000 to 2002 by USGS in the FCREW. In 2005, a bi-weekly cycle of stream water quality measurement was initiated by ARS, including: nitrogen, phosphorus, and suspended sediment concentrations, pH, dissolved oxygen, conductivity, salinity, total dissolved solids, temperature, turbidity, and oxygen reduction potential. Additionally, the USGS has been contracted to establish equations relating selected water quality variables to stream discharge at each of the three USGS stream gauges located on the lower reaches of Lake Creek, Willow Creek and Lake Creek, and on the upper reaches of Lake Creek.The Great Plains works collaboratively with ARS to contact farmers to obtain conservation and production management information relevant to the assessments. The Oklahoma Conservation Commission will conduct a habitat assessment of selected stream segments. The suite of SWAT/APEX models will be used in scaling analyses to determine linkages of conservation practices, soil properties, edge-of-field responses, and watershed scale responses. The SWAT and SWAT/MOD models will be used for assessing the impacts of conservation practices on surface and groundwater interactions at the watershed scale. The CONCEPTS model will be used to assess the role of stream bank stability and channel processes within the watershed. Land use, soil, remotely sensed estimates of surface soil water content, and other spatial data sets are being utilized to produce regional estimates of soil water content in the root zone. Impacts of conservation practices on soil physical, biological, and chemical properties will be evaluated collaboratively with the USDA-ARS Soil Quality Team. Hydrogeologic data include groundwater data from historic and current ARS wells, USGS groundwater wells from surrounding areas, and historical and current stream gages. In addition, historical databases from hundreds of monitoring wells from other experimental watersheds in this region, and in similar geologic terrain, are also available. Areas within the FCREW that have little stratigraphic control are being drilled, cored, and some established as groundwater monitoring wells.

Copyright Text: SELECTED REFERENCES: Van Liew, M.W. and Garbrecht, J.D. Hydrologic simulation of the Little Washita River Experimental Watershed using SWAT. J. Amer. Water Resources Assoc. 39(2):413-426. 2003. Van Liew, M.W., Arnold, J.G., and Garbrecht, J.D. Hydrologic simulation on agricultural watersheds: choosing between two models. Trans. ASAE. 46(6):1539-1551. 2003. Van Liew, M.W., Garbrecht, J.D., and Arnold, J.G. 2003. Simulation of the impacts of flood retarding structures on streamflow for a watershed in Southwestern Oklahoma. J. Soil and Water Cons. 58(6):340-348. Van Liew, M.W. 2004. Impact of flood retarding structures on simulated streamflow for various sized watersheds under varying climatic conditions. GIS and Remote Sensing in Hydrology, Water Resources and Environment (Proceedings of ICGRHWE held at the Three Gorges Dam, China, September 2003. IAHS Publ. 289:33-40. Van Liew, M.W., Arnold, J.G., and Garbrecht, J.D. 2003. Hydrologic simulation on agricultural watersheds: choosing between two models. Trans ASAE. 46:1539-1551. Starks, P.J., Heathman, G.C., Jackson, T.J., and Cosh, M.H. 2006. Temporal stability of soil moisture profile. Journal of Hydrology. 324:400-411. Daniel, J.A., Phillips, W.A., and Northup, B.K. 2006. Influence of summer management practices of grazed wheat pastures on runoff, sediment, and nutrient losses. Trans. ASABE. 49:349-355. Garbrecht, J.D., Van Liew, M.W., and Brown, G.O. 2004. Trends in precipitation, streamflow and ET in the Great Plains. Journal of Hydrologic Engineering. 9:360-367. Garbrecht, J.D., Starks, P.J., and Steiner, J.L. 2006. The under-appreciated climate factor in CEAP. Journal of Soil and Water Conservation. 61:110A-112A. COLLABORATORS and COOPERATING AGENCIES and GROUPS: USDA-ARS Soil Quality Team, Natural Resources Conservation Service, United States Geological Survey, Environmental Protection Agency, Oklahoma Climatological Survey, University of Oklahoma, Oklahoma State University, Oklahoma Conservation Commission, Great Plains RC&D, Local Landowners

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Last Edit Date: 5/2/2019 1:43:17 PM

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