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Full-Text Articles in Civil Engineering
Nitrate And Herbicides Removal From Groundwater Using Immobilized Algae, Sara Mollamohammada
Nitrate And Herbicides Removal From Groundwater Using Immobilized Algae, Sara Mollamohammada
Department of Civil and Environmental Engineering: Dissertations, Theses, and Student Research
To improve crop yield and control broadleaf weeds, many farmers apply nitrate-based fertilizers and chemical herbicides to their fields. Excessive use of these chemicals can cause contamination in waterbodies and impact on the public health. The physical and chemical methods have been suggested to remove these herbicides are usually costly. In this study, the capability of immobilized algal beads in removing nitrate and several herbicides of environmental concern from synthetic and actual groundwater and surface water was evaluated.
The experiments were performed in batch, sequencing batch and continuous flow modes and the effect of different operational conditions (light intensity, cultivation …
Seepage And Stability Of A Dam In An Artesian Setting, Sean A. Parks
Seepage And Stability Of A Dam In An Artesian Setting, Sean A. Parks
Department of Civil and Environmental Engineering: Dissertations, Theses, and Student Research
Willow Creek Dam is located in a unique region on the boundary of a confined aquifer, where artesian conditions exist. Recently, groundwater levels have exceeded the elevation of the downstream berm well above anticipated piezometric elevations. It was presumed from limited evidence that these high piezometric levels resulted from pressure in the aquifer rather than from seepage out of the reservoir. The purpose of this investigation was to determine the relative contributions of the reservoir and the regional groundwater to observed piezometric levels and how these levels affect seepage exit gradients and slope stability of the dam.
Comparing the head …