Submitted to: ESRI Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: August 7, 2006
Publication Date: August 12, 2006
Citation: Corwin, D.L. 2006. Spatial Considerations for Degraded Water Reuse. Twenty-Sixth Annual ESRI International User Conference Proceedings in San Diego CA, Aug 08-10, 2006. Paper No. 4C1184 Technical Abstract: The reuse of degraded waters provides one means of ameliorating the increased demand on surface and groundwater supplies for agricultural need. However, before degraded waters can be considered a viable water resource, the impact of degraded water reuse on agricultural soil must be assessed. It is the objective to present the spatial considerations needed when assessing the within-field impact of degraded water reuse on agricultural soil. A drainage water reuse study is presented where spatio-temporal changes in soil quality of a saline-sodic soil were evaluated. The spatio temporal study used electromagnetic induction ECa data and a response surface sampling design to select sample sites that reflected the spatial variability of a field located on the west side of California’s San Joaquin Valley. Soil samples were collected in August 1999 and April 2002. The properties of salinity, sodium adsorption ratio (SAR), B, and Mo were determined to be the most important in determining soil quality at the arid-zone site. Data from 1999 indicated high levels of salinity, which increased with depth, high levels of SAR, which also increased with depth, and moderate to high levels of B and Mo. The application of drainage water for 32 months leached salinity from the top 0-0.6 m, B from the top 0.3 m, and sodium and Mo from the top 1.2 m. Preliminary spatio temporal assessments from 199 to 2002 using the ECa-directed sampling methodology indicate at least short term feasibility of drainage water reuse from the perspective of soil quality when the goal is forage production for grazing livestock.