Economic Benefit of Irrigation on Beef Ranches
Drought can result in forage shortages leading to possible liquidation of the breeding herd. Liquidation is often at depressed prices, and replacement may be at elevated prices. In this...

An Overview of Factors Affecting Land Application of Food Processing Wastes
The food processing industry can use slow rate, rapid infiltration or overland flow systems. Slow rate systems are the most common method used for land application. The limiting design...

Optimum Irrigation Under Saline Conditions
A dynamic production function for cotton is estimated. Optimal irrigation volumes, timing, and qualities are calculated using dynamic programming. Optimal water quantities are sensitive...

T Measurements for Irrigation of Sweet Corn
Commonly used scheduling methods are based on a water balance approach where evapotranspiration (ET) must be either estimated from climatic data or by soil water depletion measurements....

Evaluation of Methods to Determine Peak Period Irrigation Water Requirements
Methods for estimating the peak period irrigation water requirement were evaluated as a component of the review of irrigation facility sizing criteria conducted for the Engineering and...

Review of the Lake Andes-Wagner Project Sizing
Benefit-cost analyses of the proposed U. S. Bureau of Reclamation Lake Andes-Wagner Project have shown the project to be marginally feasible. In an effort to improve the benefit-cost ratio,...

Estimation of Mean Water Depth for Border Irrigation
The mean water depth for border irrigation is derived, using dam-break simple wave solution and boundary layer theory, as a function of inflow discharge, bottom slope, bottom roughness,...

Evaluation of Basin-Furrow Irrigation Systems
The division of the total flow into basin-furrows is analyzed using both energy and momentum principles. A zero-inertia model is applied to simulate the advance phase using different infiltration...

Estimating Number and Duration of On-Times for Surge Irrigation
Research shows surge flow can achieve efficient and uniform irrigation on some soils. However, most available information focuses on computerized analysis and modeling for research purposes....

The Inflatable Weir and Its Widespread Employment for Irrigation in Japan
Although introduced in the U. S. in the 1950's for groundwater recharging, the inflatable weir has become established only in Japan, in which case it is used almost entirely...

Investigation of Main Supply Canal and Lateral Fluctuations
The Imperial Irrigation District and the U. S. Water Conservation Laboratory of Phoenix, Arizona are conducting a joint project to study the causes and effects of water level fluctuations...

Rating Curves for Adjustable Tricklers
This paper presents the approach and results of evaluating adjustable drip/trickle emitters to obtain rating curves. The emitter discharge depends on both system pressure and emitter opening...

Prognostics of Water Management in Agriculture
This paper discusses principles of methodology and application of agricultural water management prognostics. Included are irrigation and drainage prognostics in Hungary and concrete economic...

An Integrated Rehabilitation Procedure for Gravity Systems
Demands for an improved system combined with a more adjusted management mode are common in many projects where limited or strained budgets do not allow for a regular and secure water supply....

Crop Yield Models Adapted to Irrigation Scheduling Programs
A crop yield model (CRPSM) was adapted to match the data obtained with typical irrigation scheduling programs. Daily soil water content was calculated from weather data, crop growth stage...

Modeling Branching Irrigation Canal Networks
A mathematical model of branching canal network has been developed based on solving the integrated form of Saint Venant equations which describing steady and unsteady, uniform and non-uniform...

Surge Flow?Automation of Surface Irrigation?At Last
The studies which led to the development of Surge Flow at Utah State University, began as an effort to automate surface irrigation systems. The first prototype models, were electric control...

Irrigation with Reclaimed Wastewater?Recent Trends
Land application of municipal wastewater is a well established practice in California. Much of the reclaimed municipal wastewater (57%) in California is used for irrigation of fodder,...

Report of Task Committee on the Collection and Publication of Basic Water Resources Data
In 1983 members of the Irrigation and Drainage Division's Committee on Surface Water expressed concern over reductions in funding for data collection and publication programs in the United...

Furrow Modeling with Variable Hydraulic Characteristics
A zero inertia furrow irrigation model was developed to run on an IBM-compatible micro-computer. The depth gradient term of the momentum equation is approximated by averaging over the...

 

 

 

 

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