http://hdl.handle.net/1957/12250 2013-05-20T14:30:32Z http://hdl.handle.net/1957/36867 Field method for separating the contribution of surface-connected preferential flow pathways from flow through the soil matrix Sanders, Emily C.; Abou Najm, Majdi R.; Mohtar, Rabi H.; Kladivko, Eileen; Schulze, Darrell Liquid latex was used as a method to seal visible surface-connected preferential flow pathways (PFPs) in the field in an effort to block large surface-connected preferential flow and force water to move through the soil matrix. The proposed approach allows for the quantification of the contribution of large surface-connected cracks and biological pores to infiltration at various soil moisture states. Experiments were conducted in a silty clay loam soil in a field under a no-till corn-soybean rotation planted to corn. Surface intake rates under ponding were measured using a simplified falling head technique under two scenarios: (1) natural soil conditions with unaltered PFPs and (2) similar soil conditions with latex-sealed large macropores at the surface. Results indicated that the contribution of flow from large surface-connected macropores to overall surface intake rates varied from approximately 34% to 99% depending on the initial moisture content and macroporosity present. However, evidence of preferential flow continued to appear in latex-sealed plots, suggesting significant contributions to preferential flow from smaller structural macropores, particularly in two out of four tests where no significant differences were observed between control and latex-sealed plots. This is the publisher’s final pdf. The published article is copyrighted by the American Geophysical Union and can be found at: http://www.agu.org/journals/wr/. 2012-04-28T00:00:00Z http://hdl.handle.net/1957/31741 Summary report concerning water resources and water quality impacts related to geothermal activities in Oregon Slotta, Larry S. The work reported herein was partially supported through an Oregon Graduate Center contract with the Lawrence Livermore Laboratory of the University of California for the conduct of the "Oregon Geothermal Environmental Overview Study Workshop", held March 28-29, 1979 in Portland, Oregon. Partial support was also provided as part of Oregon State University's Water Resources Research Institute 1979 contract with the Pacific Northwest River Basins Commission for Water Assessment of Emerging Energy Technologies. 1979-08-01T00:00:00Z http://hdl.handle.net/1957/31731 Water Resources Research Institute. Fiscal year 1985 program report Klingeman, Peter C.; Oregon State University. Water Resources Research Institute The activities on which this report is based were financed in part by the Department of the Interior, U.S. Geological Survey, through the Oregon Water Resources Research Institute. Grant No. 14-08-0001-G1039 1986-08-01T00:00:00Z http://hdl.handle.net/1957/31724 Oregon Water Resources Research Institute. Annual program report fiscal year 1991 Warkentin, Benno P.; Oregon State University. Oregon Water Resources Research Institute The activities on which this report is based were financed in part by the Department of the Interior, U.S. Geological Survey, through the Oregon Water Resources Research Institute. Grant No. 14-08-0001-G2041 1992-09-01T00:00:00Z