Characterizing Hydraulics And Water Distribution Of Furrow Irrigation In Northeast Malheur County
DOWNLOAD
Download Characterizing Hydraulics And Water Distribution Of Furrow Irrigation In Northeast Malheur County PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Characterizing Hydraulics And Water Distribution Of Furrow Irrigation In Northeast Malheur County book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Characterizing Hydraulics And Water Distribution Of Furrow Irrigation In Northeast Malheur County
DOWNLOAD
Author : Robert Mittelstadt
language : en
Publisher:
Release Date : 1995
Characterizing Hydraulics And Water Distribution Of Furrow Irrigation In Northeast Malheur County written by Robert Mittelstadt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Furrow irrigation categories.
Furrow irrigation is the dominant practice for irrigating row crops in the western Treasure Valley region near Ontario, Oregon. Though improvements have been made in management practices over the years, excessive runoff and deep percolation are still important problems contributing to surface water and groundwater degradation. Field observations were made during two growing seasons to establish a data base from which the hydraulic surface irrigation model, SRFR (SRFR, a computer program for simulating flow in surface irrigation, developed at the U.S. Water Conservation Laboratory in Phoenix, Arizona (Strelkoff, 1991)), could be calibrated. SRFR is a numerical model, based on the principles of open channel hydraulics coupled with an empirical relationship characterizing furrow intake. SRFR is an analytical tool, with which the user supplies the physical parameters (such as furrow shape and furrow intake) and also the management variables (inflow rate and duration of inflow), and a simulation is conducted based on these conditions. Therefore, this model is a tool which provides insight into furrow irrigation processes. More specifically, SRFR can help answer such questions as which factors at the time of the irrigation are most important in determining irrigation performance. Once calibrated for a given set of conditions, various management strategies may be evaluated as to their relative effectiveness. These strategies may include, but are not limited to, cut-back irrigation, surge irrigation, alternating furrow irrigation, and laser-leveling of the field. A broad data-base is necessary for model calibration and to develop an understanding of it's limitations. Measurements of furrow intake, stream advance times, inflow and outflow, hydraulic roughness and furrow shape were obtained from several sites and irrigation events. These sites represent several crops, field lengths, field slopes, and soil textures. Using these data, a model calibration procedure was developed which matched irrigation inflow and outflow volumes and stream advance times for a given irrigation event. The calibration procedure is used to help identify those model input parameters that best describe a given irrigation event. This thesis is to provide a broad understanding of furrow irrigation systems in northeast Malheur County, recommended hydraulic parameters for use with SRFR, and the practical limitations of such hydraulic irrigation models. Irrigation performance is largely determined by the intake characteristics of the soil at the time of irrigation. Field conditions vary greatly depending on the crop, soil moisture, number of irrigations, tractor traffic, field slope, furrow shape and field history. The grower has control over only two variables which determine irrigation performance: inflow rate and duration. A difference in intake and irrigation performance was found to exist between non-wheel and wheel traffic furrows. These differences became less noticeable late in the season. Straw mulching greatly increases the furrow hydraulic roughness and therefore increases stream wetted perimeter and advance time. Vegetative interference from crops such as potato and sugar beets increase furrow hydraulic roughness late in the season. Initially, furrow shape depends on the crop and which cultivating implement is used. Furrow shape may evolve during the growing season depending on field slope, flow velocities, crop stand and the presence of crop residues and straw mulch.
Diagnosis And Improvement Of Saline And Alkali Soils
DOWNLOAD
Author : L. E. Allison
language : en
Publisher:
Release Date : 1947
Diagnosis And Improvement Of Saline And Alkali Soils written by L. E. Allison and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1947 with Alkali lands categories.
Improving Water Management Recent Oecd Experience
DOWNLOAD
Author : OECD
language : en
Publisher: OECD Publishing
Release Date : 2003-02-21
Improving Water Management Recent Oecd Experience written by OECD and has been published by OECD Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-02-21 with categories.
This publication brings together the recent work of the OECD on water management issues. It identifies the main policy challenges addressed by that work for sustainable water management.
Duty Of Water
DOWNLOAD
Author : Burton Percival Fleming
language : en
Publisher:
Release Date : 1905
Duty Of Water written by Burton Percival Fleming and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1905 with Agriculture categories.
Micro And Macro Level Approaches For Assessing The Value Of Irrigation Water
DOWNLOAD
Author : Robert C. Johansson
language : en
Publisher:
Release Date : 2016
Micro And Macro Level Approaches For Assessing The Value Of Irrigation Water written by Robert C. Johansson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Many countries are reforming their economies and setting macroeconomic policies that have direct and indirect impact on the performance of the irrigation sector. One reason for the movement toward reform in the water sector across countries is that water resources are increasingly becoming a limiting factor for many human activities. Another reason for increased pressures to address water policy issues is that many countries are in the process of removing barriers to trade, particularly in agricultural commodities. Therefore, knowledge of the value of water when crafting domestic and macroeconomic policies is important to compare the variable impacts of reform across sectors of the economy and populations within the country. Researchers have used many methods for assessing the value of irrigation water. This survey reviews a broad literature to ascertain how two basic questions have been addressed by research over the past few decades. First, what is the value of water across different sectors and levels? Second, how will this value change under different macroeconomic and domestic policies? This survey details a number of methods for approaching these two questions. The literature has been organized according to a progression from theoretical underpinnings to empirical approaches to how the value of irrigation services are relevant to the link between globalization and poverty.
A Dictionary Of The French And English Languages
DOWNLOAD
Author : Gabriel Surenne
language : en
Publisher:
Release Date : 1876
A Dictionary Of The French And English Languages written by Gabriel Surenne and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1876 with categories.
Statistical Highlights Of U S Agriculture
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2000
Statistical Highlights Of U S Agriculture written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Agriculture categories.
Notes On Sedimentation Activities
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1969
Notes On Sedimentation Activities written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Hydrology categories.
Methods Of Quickly Vegetating Soils Of Low Productivity Construction Activities
DOWNLOAD
Author : Francis William Bennett
language : en
Publisher:
Release Date : 1975
Methods Of Quickly Vegetating Soils Of Low Productivity Construction Activities written by Francis William Bennett and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Erosion categories.
Corn Production In Kansas
DOWNLOAD
Author : Samuel Cecil Salmon
language : en
Publisher:
Release Date : 1926
Corn Production In Kansas written by Samuel Cecil Salmon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1926 with Corn categories.