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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"subsurface drainage"”.
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Design tools and performance evaluation of uncoupled subsurface drainage systems
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Biogeochemistry of denitrifying bioreactors to enhance phosphorus removal from agricultural subsurface drainage
… surface water nitrate loadings from agricultural subsurface drainage. Recent studies have identified that subsurface drainage can also contribute to the loss of phosphorus from agricultural soil. Therefore, this thesis investigates the potential of DBRs to incorporate iron-based materials to …
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Fully-coupled physically-based approach for modeling conventional and managed subsurface drainage
"Subsurface drainage is an essential water management practice that is partly responsible for the legendary agricultural productivity of the ""corn-belt"" region in the United States. Recent researches indicate that the conventional drainage practice has contributed a large percentage of the …
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Evaluating Steel Byproducts and Natural Minerals for Phosphate Adsorption from Agricultural Subsurface Drainage
… have shown that in addition to surface runoff, subsurface drainage can contribute substantially to the loss of P from soils. The use of adsorption materials to bind P has emerged as a promising technology for P removal. The objective of this study was to perform batch and column experiments to …
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The use of numerical groundwater model to improve effectiveness of subsurface drainage system in irrigated field
… model can be effectively used for design of subsurface<br/>drainage systems for controlling salt concentration in the root zone on salt affected<br/>irrigated land. The SEAWAT model was used to optimize subsurface drainage design to<br/>ensure that the salt concentration of the groundwater at …
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Impact of Subsurface Drainage on Water Yield for Typical Soil and Weather in Eastern South Dakota
<p>Subsurface drainage in agricultural land changes the field water balance by providing an alternate pathway for subsurface water. Determining the effects of subsurface drainage on downstream hydrology requires quantifying the components of the water balance. A number of studies have looked at the …
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Modification of the Field Moisture Balance Water Quality model (FMBWQ) to simulate subsurface drainage and preferential flow
… study was to add the capability of simulating subsurface drainage and preferential flow to FMBWQ. The modified FMBWQ was calibrated and validated for an agricultural plot in the Iowa State University North East Research Center near Nashua, Iowa (hereafter referred to as the Nashua site). The …
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A Field-Scale Study of Controlled Tile Drainage and a Pond-Wetland to Attenuate Nutrients from Agricultural Overland Runoff and Subsurface Drainage on a Farmer-Operated Seed Farm in Saint-Isidore, ON
Agricultural runoff and drainage are significant contributors to the deterioration of water quality in receiving water bodies. Ponds and constructed wetlands are proven treatment systems that can remove nutrients and reduce peak flow. A combined controlled drainage structure (CDS), free drainage …
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Analytical and Experimental Analyses of the Structural Properties of a Columnar Geocomposite Material
… geocomposite is an innovative concept in subsurface drainage. An investigation has been conducted to study the structural properties of the columnar geocomposite under uniform pressures. The research included both analytical and experimental analyses.
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Predicting Field Water Balance, Crop Yield, and the Economics of Drainage Under Various Cropping Systems Using Drainmod
<p>Subsurface drainage received considerable attention during the recent few years in South Dakota. While subsurface drainage is a widely accepted water management practice for increasing crop yield, research implicated tile drainage in surface and groundwater quality problems. Conservation …
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Modeling of water table profile for a subirrigation system and evaluation of reliability of drainmod for the Lower Fraser Valley
Subsurface drainage and sub irrigation were simulated in the Lower Fraser Valley of British Columbia under different water regimes with DRAINMOD and the results were compared with data obtained from conventional subsurface drainage and subirrigation field experiment at Boundary Bay in the Lower …
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Development of DRAINMOD-based VBA model for evaluating drainage system response
… that incorporates climatological data, crop drainage requirements and drainage theory into a viable design procedure. The design of subsurface drainage systems is affected by climatic variables such as temperature and precipitation. Climatic conditions are likely to change in the coming …
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Modification and Evaluation of a Water Balance Model to Simulate Corn Yields in Drained Waterways
… modified to determine yield response to tile drainage in waterways based on climate data. Modifications to the model were completed based on field measurements. Infiltration and tile drainage routines in the model were modified to improve the model simulation of the water table. Additionally …
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A Comparative Analysis of Sorghum and Maize as Bioenergy Feedstock for the US Midwest: Compositional Attributes and System Nitrogen Dynamics
… on N removal in harvested tissue and N loss to subsurface drainage water, was conducted at Purdue University’s Water Quality Field Station. The study compared continuous residue removal systems of sorghum and maize to grain-only maize-based systems, two of which included a soybean rotation. In …
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Phosphorus transport in the Berg River, Western Cape
… of phosphorus through the Berg River drainage basin. Such a model had to consider (1) export of phosphorus from nonpoint (diffuse) sources via surface and subsurface drainage, and from point sources such as wastewater treatment discharges, (2) transportation of phosphorus in the water …
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Karstification of the Pennyroyal Plain Behind the Retreating Chester Escarpment: Warren, Simpson & Logan Counties, Kentucky
… investigations were conducted on the drainage systems of an area of the Pennyroyal sinkhole plain of south central Kentucky. The degree of karstification of five area streams was studied to develop an understanding of the evolution of drainage as the landscape changes from a sandstone …
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Effect of passive and active heating on the performance of denitrifying bioreactors
… zone in the Gulf of Mexico. Nutrient runoff via subsurface drainage flow enter surrounding water bodies and drain to the Gulf of Mexico causing lasting ecological damage. This influx of nutrients into these water bodies is challenging the scientific community to create innovative solutions to …
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An Analysis of Base-Level Conduit Sedimentation in South Central Kentucky
… can affect the water and sediment supplies to subsurface drainage systems and thus may be reflected in the sedimentary structure, texture and rates of deposition of cave sediments. Cave sediments in two south central Kentucky caves were studied to evaluate a possible, relationship between …
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Observation-Based Algorithm Development For Subsurface Hydrology In Northern Temperate Wetlands
<p>This study investigates wetland subsurface hydrology, as well as biogeochemistry - which is strongly influenced by water and temperature dynamics - as these interactions are expected to be highly significant, yet remain poorly represented in current ecosystem and climate models.</p> <p>Northern …
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Changes in Stormwater Thermal Loads Due to Bioretention Cells
… and that other cell characteristics, such as subsurface drainage system length, may play an important role in runoff temperature reduction.
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