Investigating Groundwater/Surface Water Interaction at the Diversion Dam Site: Report Documentary 2007-2008

摘要

This report concerns hydrological monitoring of groundwater wells installed with pressure transducers at four Bosque Ecosystem Monitoring Program (BEMP) sites, which bracket the Albuquerque Drinking Water Diversion Dam (DWD). The data obtained from these pressure transducers are coupled with river discharge and stage data from the U.S. Geological Survey's (USGS) river gauge 08329918 (at Alameda Bridge) located approximately 450 m north of the DWD, to provide a database for the purpose of estimating the interaction between groundwater and surface water, as well as the potential effects of the DWD in this urban stretch of the Rio Grande. Also included in this report is a description of the monitoring sites, the techniques used to install shallow groundwater wells and manage pressure transducers, and a presentation and analysis of groundwater data results from before, during, and after DWD construction, with a focus on the first year of baseline data covering the period of October 2006 through September 2007. This data are used to perform a variety of analyses, which assist in understanding how groundwater levels are influenced by river discharge, rain events, DWD trial operations, and soil properties. Key findings of this study indicate that soils within the study reach are conductive, with groundwater responding quickly to river stage changes. Groundwater levels are mainly a function of the boundary conditions (river and riverside drains), and become deeper towards the levees. Lateral hydraulic gradients are less than 1 percent between wells, with no major changes during the study period. Effects of DWD construction produced about a 9- month disruption in water tables mainly at the Diversion (ED10) site. Water tables then returned to preconstruction values.