Multi-Purpose Subsurface Drainage System for the Town of Saguache
The town of Saguache, Colorado had a high water table during the irrigation season that caused numerous problems within the town and resulted in high infiltration rates to the sewer system...

Irrigation Scheduling for Groundwater Protection
Supplemental irrigation water is necessary for the production of high quality agricultural crops. Growers in Suffolk County, New York have traditionally irrigated according to weather...

Flexible Irrigation Supply Pilot Projects—Part I: Principles
The principles are described (Part I) and illustrated with developing countries case studies (Part II) to present the techniques that economically permit the use of farmer controlled variable...

Flexible Irrigation Supply Pilot Projects—Part II: Sri Lanka, Pakistan, India, Egypt
The Sri Lanka project covers about 150 one hectare farms on the lower half of a unit served by one distributary. The upper part, because of delays in construction, was left as an earth...

Design and Management of Drip Systems in Hawaii
In 1970, Hawaii's sugar industry began implementing drip irrigation to minimize labor requirements, improve water and nutrient application efficiencies, and maximize yields....

Adopted Drip Irrigation Technology for Developing Countries
Two low cost drip irrigation systems are presented. Even though the uniformity of these systems is not as high as the conventional drip systems, the initial and operating costs of the...

Determining Criteria for Operating Irrigation Systems
Operation variables involved in the management of given irrigation systems are the irrigation time and the inlet head, when sprinkling or drip methods are applied, or the time of cutoff...

Shallow Groundwater Collection for Reuse in Irrigation
A prototype system of subsurface drains for collection of shallow groundwater and reuse of drainage water for reuse in irrigation was examined. The system involved a field with subsurface...

Modeling Tertiary Unit Performance in Large Irrigation Systems
Large irrigation systems constructed in the Asian region, deliver water over a wide area with varied agroclimatic conditions and cropping patterns. In order to evaluate the performance...

A Decision Support System for Prediction of Crop Yield, Evapotranspiration, and Irrigation Management
Computer simulation models have been developed which predict growth, development, and yield for grain legumes. These models can be applied for yield prediction as well as water management...

Canal Models and You
Unsteady canal simulation models require serious investments of time and personnel. The reasons for deciding to invest in a model, as well as reasons to not invest, are discussed. Canal...

Numerical Methods Used to Model Unsteady Canal Flow
Investigating the response characteristics of irrigation waer supply and distribution systems is essential if a good design is to be developed. Numerical simulation techniques have been...

Water Quality of Shallow Groundwater Reused for Irrigation
Drainage water was collected by subsurface drains and reapplied to half of a drained alfalfa field in Fallon, Nevada, during the 1989 irrigation season. Irrigation district water was applied...

Crop Simulation Modeling for On-Farm Irrigation Management
Crop models that estimate crop productivity in response to soil water offer potential for on-farm irrigation management. Useful models must produce accurate estimates of the soil water...

Crop Growth Models in Irrigation Management: Applications and Limitations
Crop growth models can provide helpful input to the complex process of on-farm irrigation decision making. The use of crop models in irrigation management will likely expand due to improved...

Evapotranspiration and Growth Predictions of CERES Maize, Sorghum and Wheat in the Southern High Plains
Daily ET, leaf area index, and dry matter accumulation were predicted using CERES models for maize, sorghum, and winter wheat grown at Bushland, Texas to determine the models'...

Unique Problems in Modeling Irrigation Canals
Irrigation-canal modeling is based on the same unsteady flow equations used for river modeling. However the canal and irrigation environment present several unique simulation problems...

Informed Use and Potential Pitfalls of Canal Models
Numerical models of unsteady flow in canals are used in the design, analysis and operation of irrigation canal systems. Their informed use requires knowledge of the potential pitfalls,...

Current Investigations of Hawaiian Taro Pondfield Irrigation Systems
Due to the prominence of taro pondfield irrigation water in the State of Hawaii's system of water rights, the heightened attention given to water resource management under...

Description and Evaluation of Program: SNUSM
The Staggered Net Unsteady State Model (SNUSM) was developed in the early 1980's by the United States Bureau of Reclamation under the direction of Bob Gooch and Al Graves....

 

 

 

 

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