Irrigation Management

Permanent URI for this collection

https://hdl.handle.net/10217/195478

Browse

Now showing 1 - 20 of 570

Open Access
15th annual Central Plains irrigation conference and exposition proceedings
(Colorado State University. Libraries, 2003-02) Central Plains Irrigation Conference, author
Open Access
2007 Central Plains irrigation conference, proceedings
(Colorado State University. Libraries, 2007-02) Central Plains Irrigation Conference, author
Open Access
2009 irrigation cropland lease arrangements
(Colorado State University. Libraries, 2009-02) O'Brien, Daniel, author; Ziegler, Todd, author; Wood, Mark, author
Open Access
A decision support system for field drainage management
(Colorado State University. Libraries, 2002-07) Garcia, Luis A., author; Gillham, Daniel, author; Patterson, David, author; Harma, Blair, author; U.S. Committee on Irrigation and Drainage, publisher
The Colorado State University Irrigation and Drainage model (CSUID) is a decision support system (DSS) that helps design and/or manage irrigation and drainage systems, which maintain crop productivity while controlling drainage return flows. CSUID includes components for irrigation scheduling; root growth calculations; flow and transport in unsaturated and saturated zones; drain discharge; and crop yield estimates. The DSS runs on a PC with Windows 95/NT. Data for the model is currently being collected from four fields in Colorado's Arkansas River Basin.
Open Access
A historical view: transmountain diversion development in Colorado
(Colorado State University. Libraries, 2001-06) Winchester, John N., author; U.S. Committee on Irrigation and Drainage, publisher
As the headwaters for seven major rivers, water resources in Colorado have been diverted for use for over 150 years. Transbasin diversions have been developed to move water from one river basin to another, including transmountain diversions, which move water over the continental divide. Transmountain diversions have historically been developed to provide water for irrigated agriculture and municipal purposes. This paper briefly discusses the development of each of Colorado's 30 transmountain diversions between the Colorado, South Platte, Arkansas and Rio Grande river basins, and provides a summary of diversions for recent years.
Open Access
A leading-edge irrigation demand model for assessing irrigation expansion with finite water supplies
(Colorado State University. Libraries, 2002-07) Chinn, Wally R., author; Traynor, Arva J., author; Roth, Don W., author; Hofer, Bonnie C., author; U.S. Committee on Irrigation and Drainage, publisher
Like many jurisdictions in North America, the irrigation industry in Alberta, Canada has found it necessary to intensively examine its future state of development, in view of substantially increased competition for a finite supply of available water. In order to do so, it was recognized that available technical science and assessment tools needed to be up-dated and expanded. Specifically, the opportunity and ability to utilize state-of-the-art computer modelling techniques could allow much more detailed and varied analyses to be carried out. As part of a broad scope basin water management planning review, the development of a complex irrigation demand model was undertaken. After several years of detailed and intensive software development, a suite of data input, irrigation simulation and analysis tools has been derived. The application of the irrigation demand model component provides for very detailed projections of daily water requirements, consumptive use, conveyance and application losses, as well as return flows. Annual and multi-year irrigation demands can be determined in conjunction with water supply conditions that reflect both the interrelationship with the vagaries of climate as well as varying scenarios of development within the industry. In particular, output from the application of the whole suite of tools indicates both the projected level of water supply deficits as well as the potential impacts of those shortages.
Open Access
A look at twenty years of SDI research in Kansas
(Colorado State University. Libraries, 2009-02) Lamm, Freddie R., author
Open Access
A method describing precise water application intensity under a CPIS from a limited number of measurements
(Colorado State University. Libraries, 2007-10) Molle, B., author; Granier, J., author; Drechsel, A., author; U.S. Committee on Irrigation and Drainage, publisher
Centre pivot irrigation systems are known for their irrigation distribution performance potential. Unfortunately the performance analysis of centre pivot irrigation systems is often restricted to the uniformity of distribution. Depending on the characteristics of the applied rainfall, a system designed for high uniformity does not guarantee a high application efficiency once the system is in operation. A method is proposed in the present paper to analyse the average rainfall depth of application and kinetic energy delivered to the soil by individual droplets all over the machine. The method requires water distribution profiles, the distribution of droplet size and velocity along the radius of coverage for any nozzle, and pressure and height of the emitter installed on the machine. Considering the number of nozzles and the range of pressure applied, there is the need for a method calculating: the emitter maximum radius of coverage, then the rainfall distribution profile, then the droplet distribution and finally the associated kinetic energy delivery. These parameters are calculated on a new model of classical design sprayers proposed by IWT Company. These results are being integrated on a centre pivot nozzle chart design software presented in the poster session.
Open Access
A practical method for volumetric delivery of water
(Colorado State University. Libraries, 2007-10) Pourzand, Ahmad, author; U.S. Committee on Irrigation and Drainage, publisher
Volumetric delivery of water in irrigation networks has been recognized as a major step for optimum use of water for agricultural purposes. This requires an appropriate water demand management, associated equipment, and an information system. In this paper, a summary of a guideline for volumetric water delivery in irrigation networks of Iran has been presented. In this regard, the principles and prerequisite conditions for volumetric water delivery have been discussed. Also the processes of signing an agreement with the water users and details of water delivery have been defined. Furthermore topics of training for different stakeholders in the irrigation network including managers, water distributors, and representatives of the farmers have been introduced.
Open Access
A reflection on irrigation changes
(Colorado State University. Libraries, 2003-02) Heermann, Dale F., author
Open Access
A return look at dormant season irrigation strategies
(Colorado State University. Libraries, 2012-02) Schlegel, Alan J., author; Stone, Loyd R., author; Dumler, Troy J., author; Lamm, Freddie R., author
Many of the irrigation systems today in the Central Great Plains no longer have the capacity to apply peak irrigation needs during the summer and must rely on soil water reserves to buffer the crop from water stress. Considerable research was conducted on preseason irrigation in the US Great Plains region during the 1980s and 1990s. In general, the conclusions were that in-season irrigation was more beneficial than preseason irrigation and that often preseason irrigation was not warranted. The objective of this study was to determine whether preseason irrigation would be profitable with today's lower capacity wells. A field study was conducted at the KSU-SWREC near Tribune, Kansas, from 2006 to 2009. The study was a factorial design of preplant irrigation (0 and 3 in), well capacities (0.1, 0.15, and 0.20 in day-1 capacity), and seeding rate (22,500, 27,500, and 32,500 seeds a-1). Preseason irrigation increased grain yields an average of 16 bu a-1. Grain yields were 29% greater when well capacity was increased from 0.10 to 0.20 in day-1. Crop water productivity (CWP, grain yield divided by crop water use) was not significantly affected by well capacity or preseason irrigation. Preseason irrigation was profitable at all well capacities. At well capacities of 0.10 and 0.15 in day-1, a seeding rate of 27,500 seeds a-1 was generally more profitable than lower or higher seeding rates. A higher seeding rate (32,500 seeds a-1) increased profitability when well capacity was increased to 0.2 in day-1.
Open Access
A review of mechanized irrigation performance for agricultural wastewater reuse projects
(Colorado State University. Libraries, 2006-02) LaRue, Jacob L., author
Open Access
A river of change: proceedings of the 18th annual South Platte forum
(Colorado State University. Libraries, 2007-10) Colorado Water Resources Research Institute, author
Open Access
A simulation model for evapotranspiration of applied water
(Colorado State University. Libraries, 2002-07) Orang, Morteza N., author; Matyac, J. Scott, author; Snyder, Richard L., author; Geng, Shu, author; Sarreshteh, Sara, author; U.S. Committee on Irrigation and Drainage, publisher
The SIMETAW program was written to provide a new and innovative tool for estimating evapotranspiration of applied water (ETAW), which is a seasonal estimate of the water requirement for evapotranspiration of a crop minus any water supplied by effective rainfall. ETAW information is needed to determine consumptive use requirements. In addition to using measured weather data, the SIMETAW program simulates daily weather data from monthly climate data. Simulation of daily weather data where only monthly means exist is a good tool for filling missing data points. In addition, the simulation program is useful for studying the effects of climate change on ETAW. All of the ETAW calculations are done on a daily basis, so the estimation of effective rainfall and, hence, ETAW is greatly improved over earlier methods. In addition, the use of the widely adopted Penman-Monteith equation for reference evapotranspiration (ETo) and improved methodology to apply crop coefficients for estimating crop evapotranspiration is used to improve ETAW accuracy.
Open Access
Access and use of ET data on the Internet
(Colorado State University. Libraries, 1998-02) Hubbard, Kenneth G., author
The High Plains Climate Center (HPCC) was established in 1987 and is one of six centers providing coverage of the continental U.S. HPCC is located at the University of Nebraska in Lincoln. HPCC's mission is to carry out applied climate studies to aid in the development of improved climate products for use in an array of climate services, including data collection, analysis, and dissemination in the HPCC region. This paper describes the Automated Weather Data Network (AWDN) and the interfaces that provide near real time climate services with emphasis on ET or crop water use. Automated weather stations are monitored daily at 139 locations in ten states. Data are subjected to quality assurance testing and made available to the public. AWDN data are merged with a stream of data that includes the cooperative network data and historical data dating to the 1800's. Queries by the public to the subscription based on-line interactive system have reached 6000-7000 per month while queries to the HPCC home page average 15-20K per month.
Open Access
Accuracy of radar water level measurements
(Colorado State University. Libraries, 2007-10) Fulford, Janice M., author; Ester, Lee W., author; Heaton, John W., author; U.S. Committee on Irrigation and Drainage, publisher
Radar water-level sensors are generating a lot of interest among hydrographers because of their ease of installation and low maintenance. However, limited information is available on the accuracy and performance of radar sensors in the field. This paper presents test results from recent field measurements made with radar water-level sensors. Field data collected with two pulse radars, (Design Analysis Associates H-3611 and the Ohmart Vega Puls 62) and one continuous wave frequency modulated radar (Saab Rosemount) during lake drawdown at Horse Mesa Dam, Arizona, are presented and compared against a conventional float-well system. (The use of firm, trade and brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Government). Measured radar data were analyzed for possible sources of systematic measurement uncertainty (error) including sensor height above water (air gap), air temperature and surface waves. The Ohmart Vega sensor has a systematic uncertainty from varying air gap. The H-3611 and the Saab Rosemount sensor do not have an obvious systematic uncertainty from varying air gap. None of the radar sensors have an obvious uncertainty from surface waves when compared with the float-well systems. No systematic uncertainty due to temperature or wind speed was noted for any of the radars. Analysis of the field data indicate that the data measured by the H-3611 and the Saab Rosemount are not statistically different from that collected by the float-well system. For the data measured by the Ohmart Vega, a systematic error of about 0.3 ft over a 35-ft change in water level occurred during the field measurements.
Open Access
Achieving a sustainable irrigated agroecosystem in the Arkansas River Basin: a historical perspective and overview of salinity, salinity control principles, practices, and strategies
(Colorado State University. Libraries, 2008-02) Sutherland, P. Lorenz, author
Open Access
Adaptive scheduling algorithm for a PV-powered irrigation system
(Colorado State University. Libraries, 2009-11) Fadel, Moustafa A., author; U.S. Committee on Irrigation and Drainage, publisher
Optimal management of irrigation systems and their efficient use of energy is a major global concern where energy resources are jeopardized. Effective solar irradiance in the United Arab Emirates is available most of the year which makes it easy to project PV (Photo Voltaic) system output and the produced flow and pressure produced by a PV-powered DC pump. A PV- irrigation system was developed in the experimental farm of the College of Food and Agriculture, United Arab Emirates University. In this paper an adaptive scheduling scheme is developed to provide an adaptive control of a photovoltaic powered irrigation system according to the availability of solar energy as well as the field conditions of the irrigated zones. Simulation of the PV irrigation system including PV module, pump and irrigation network is carried out using Matlab™ to predict power output using historical data, and water application rates accordingly. An executive irrigation schedule is also developed utilizing direct weather data from weather station to implement unexpected variation in weather conditions and field water requirements as well.
Open Access
Advances in PLC-based canal automation
(Colorado State University. Libraries, 2002-07) Burt, Charles M., author; Piao, Xianshu, author; U.S. Committee on Irrigation and Drainage, publisher
A short history of canal automation is given. PLC-based canal automation is relatively new. Advances in PLC-based canal automation are listed. Also listed are some of the remaining challenges. Recent advances have been made in understanding unsteady flow simulation procedures, the form of the control algorithms used, the tuning procedures for these control algorithms, and the field programming of the algorithms into PLCs. The experiences of the Cal Poly Irrigation Training and Research Center (ITRC) in automating a variety of canals with upstream and downstream control are given.
Open Access
Advances in soil mapping for improved irrigation management
(Colorado State University. Libraries, 2001-02) Buchleiter, Gerald W., author