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Oklahoma City, OK, United States

Porter M.A.,Oklahoma Water Resources Board | Bidlack J.E.,University of Central Oklahoma
Communications in Soil Science and Plant Analysis | Year: 2011

This research was designed to study the effects of drought on pigeon pea [Cajanus cajan (L.) Millsp.] morphology, biomass, and vessel diameter. Cultivated seeds of pigeon pea (cv. Georgia-II) were germinated, maintained in an environmental chamber, and arranged as a split-plot design with four replications; harvest was the main effect and watering regimens were tested against residual error. Plants were watered every 2, 4, 8, 16, or 32 days. Number of stems and leaves, as well as total plant height, were measured weekly. Dry weight (DW) of roots, stems, and leaves were recorded at each harvest, and root cross sections were viewed to determine vessel diameter. Results indicated that plant morphology, biomass, and vessel diameter were significantly affected by harvest and watering regimen. Plants watered more frequently had more stems and leaves, grew taller, accumulated greater DW, and had larger diameter vessels within root tissue. © Taylor & Francis Group, LLC. Source


Rehring J.,CDM | Reisinger D.,CDM | Arthur K.,Oklahoma Water Resources Board | Lilly G.,U.S. Army
Watershed Management Conference 2010: Innovations in Watershed Management under Land Use and Climate Change - Proceedings of the 2010 Watershed Management Conference | Year: 2010

The Oklahoma Water Resources Board (OWRB) has initiated a major update of the Oklahoma Comprehensive Water Plan (OCWP) through a unique federal/state partnership with the United States Army Corps of Engineers (USACE). Scheduled for completion in 2012, the OCWP is assessing the physical and legal availability of Oklahoma's surface and groundwater resources, all in the context of water quality and infrastructure constraints, to meet the state's needs through 2060. The forecasted demands are being compared to physically and legally available supplies using the Oklahoma H〈inf〉2〈/inf〉O tool, a first-of-its-kind analysis tool that interactively assesses the potential for future water shortages on both a statewide and watershed level. Using a customized Microsoft Access interface, together with geographic information systems (GIS), the Oklahoma H〈inf〉2〈/inf〉O tool provides unprecedented analysis power in evaluating potential future "what-if" scenarios and potential solutions for meeting the state's water needs for the next 50 years. It has been used to quickly test alternative solutions brought forth through the OCWP's public input process and serves as the foundation for regional supply assessments and basin-level water plans. By adopting a continuous planning process, Oklahoma is adaptively managing its water resources on a basin-by-basin level. This process provides for careful consideration of anticipated future conditions while mitigating against the uncertainties in supply and demand that climate change, land use practices, and other future influences will bring. © 2011 ASCE. Source


Cox T.J.,Cdm Smith | McCluskey M.J.,Cdm Smith | Arthur K.,Oklahoma Water Resources Board
World Environmental and Water Resources Congress 2012: Crossing Boundaries, Proceedings of the 2012 Congress | Year: 2012

There is a recognized need for water supply planning tools and methodologies that allow for the inclusion of climate change forecasts and are practical and useable for water planners. This study, funded by a Bureau of Reclamation WaterSMART grant, focused on addressing this need. The goal was to develop tools and demonstrate methods that are effective and defensible at a planning level, while simultaneously cost-effective and practical given the constraints associated with most planning studies. We applied a suite of numerical tools, some which were newly developed under this project, to quantify year 2060 firm yields for two case study reservoirs in western Oklahoma. The analysis utilized a range of climate change forecasts from multiple global climate models (GCMs) and quantified uncertainties at various steps in the process. Included here was quantification of uncertainties associated with different climate data ensembling techniques and choice of hydrologic model. Results indicate that priority should be given to incorporate a breadth of climate projection data over development of sophisticated hydrologic models in these types of studies © ASCE 2012. Source

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