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Dissertation
Impact of crop residue and cover crop management on soil hydraulic properties
Authors: --- --- --- --- --- et al.
Year: 2018 Publisher: Liège Université de Liège (ULiège)

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Abstract

As the world population is increasing in a world threatened by global warming, the uncertainty on our abilities to provide enough resources is growing. Among these concerns, water is a major element. Therefore, new farming methods, more respectful of our primary resources and of the durability or our soils are emerging. This study focuses on the effects of the type of tillage, crop residue management and the date of plowing on the hydraulic properties of the soil. Therefore, the water content has been studied from 2014 to 2016 after eight different treatments split on three fields. The tests showed that incorporating the crop residues was the most important factor improving the water storage capacity thanks to an increase of the organic matter. To a lesser extent, a reduced tillage has also a positive effect on the water storage. However, it has a significant positive effect compared to other treatments on the water retention capacity after a rain event. That might be explained by the smaller size of the soil pores, often caused by such treatment. The timing of tillage has no significant impact on the storage capacity or on the water retention of the soil. Conclusions could thus be drawn for the three studied factors. However, to increase the understanding on the treatment’s impact, a similar study should be conducted in a few years, when the soil modifications will be more pronounced.


Book
Canal Automation for Irrigation Systems
Authors: --- ---
ISBN: 1680157957 0784478619 Year: 2014 Publisher: Reston, Virginia : American Society of Civil Engineers,

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Prepared by the Task Committee on Recent Advances in Canal Automation of the Irrigation Delivery and Drainage Systems Committee of the Irrigation and Drainage Council of the Environmental and Water Resources Institute of ASCE. Canal Automation for Irrigation Systems focuses on the technical aspects of modernizing irrigation systems through use of automated canal control systems. Canal automation has always offered an opportunity to save water and improve the efficiency of irrigation water supply projects or irrigation district operations. Recent technological and engineering advances now enable more accurate control of water deliveries throughout all parts of an irrigation project. Using information collected from irrigation systems around the world in conjunction with new advances in control theory research, this Manual of Practice examines how and when to implement canal automation within the context of canal modernization. Topics include: the modernization process, constraints, and concepts; survey of irrigation physical infrastructure; SCADA systems; control operation concepts; canal hydraulic properties; control methods; verification of controller performance; and implementation of control systems. MOP 131 is an essential reference for professionals in agricultural and irrigation engineering, as well as owners, managers, and operators of irrigation water delivery systems.


Dissertation
Soil hydrodynamic behavior characterization in Mindanano : Philippines
Authors: --- ---
Year: 2012 Publisher: [S.l. : chez l'auteur],


Book
Estimation of Aquifer Hydraulic Properties by Inverse Numerical Modeling of Aquifer Pumping Tests (ANSI/ASCE/EWRI 70-19)
Authors: ---
ISBN: 0784482527 Year: 2020 Publisher: Reston : American Society of Civil Engineers,

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Prepared by the Standards Committee on Fitting of Hydraulic Conductivity Using Statistical Spatial Estimation (called KSTAT) of the Standards Development Council of the Environmental and Water Resources Institute of ASCEEstimation of Aquifer Hydraulic Properties by Inverse Numerical Modeling of Aquifer Pumping Tests is the fifth in a series of standards that seeks to enhance the probabilistic and empirical characterization and understanding of the saturated hydraulic conductivity (Kstat), a key groundwater parameter.ANSI/ASCE/EWRI 70-19 provides guidelines for estimating the hydraulic properties of a groundwater system by inverse numerical modeling of aquifer pumping tests. This standard is applicable to situations where inverse methods based on analytical solutions for aquifer response to pumping are not applicable. Guidance is provided on using a numerical groundwater flow model to simulate an aquifer pumping test and estimate aquifer hydraulic properties. The methodology is based on minimizing residual error between observed and simulated heads by adjusting (calibrating) values of the pertinent aquifer hydraulic properties, for example, transmissivity, storativity, and leakance, such that there is a close match between the observed and simulated values.Standard ANSI/ASCE/EWRI 70-19 will be useful to environmental engineers, water resources engineers, and any professional who uses hydraulics in engineering.


Book
Treatment system hydraulics
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ISBN: 0784471886 Year: 2008 Publisher: Reston, VA : ASCE Press,

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Abstract

When it comes to water and wastewater treatment facilities, environmental engineers quickly discover that knowledge of chemical, physical, and biological processes is not enough to ensure a workable design and trouble-free operation. The success of a treatment system depends to a significant degree on the system's fluid flow—that is, on the selection and arrangement of pipes, channels, valves, pumps, and other hydraulic components that move fluid through the system. Treatment System Hydraulics addresses the nuts-and-bolts of treatment systems, examining typical variables and describing methods for solving the problems faced by practitioners on a daily basis. The book begins with an introduction to treatment systems and hydraulics and explains the basic concepts of fluid properties, fluid statics, and fluid flow. Then Bergendahl discusses the factors that shape engineering decisions: friction in closed conduits, pumps and motors, granular media, valves, instrumentation, materials and corrosion, effects of transient conditions, and open channel flow. Each chapter presents fundamental concepts and applications in diverse situations, along with worked examples and problem sets. Suitable for undergraduate and graduate courses, Treatment System Hydraulics is also an useful reference for environmental, mechanical, civil, and chemical engineers designing or managing water treatment facilities.

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