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United States Department of Agriculture

Agricultural Research Service

Title: Constraints to Real-Time Control of Surface Irrigation

Authors
item Sousa, P - UNIVERSITY OF LISBON
item Trout, Thomas

Submitted to: Irrigation and Drainage International Symposium Proceedings
Publication Type: Proceedings
Publication Acceptance Date: June 26, 1992
Publication Date: N/A

Interpretive Summary: Practical, automatic real-time control of surface irrigation faces several difficult constraints. Most surface irrigation water supplies must be scheduled in advance and use must be coordinated with other demands. Either the supply systems must be able to adapt to the occasional demand of automatic systems, or the application systems must communicate their needs to the supply system with the required lead time. Surface irrigation performance depends strongly on soil surface and infiltration characteristics. These parameters normally vary widely spatially and from irrigation-to-irrigation, and are difficult to predict. Performance monitoring and system adjustment is usually required to insure good performance, especially during early season irrigations. Automatic real-time control systems thus must include some type of performance feed-back control. This paper discusses the severity of these constraints and possible solutions for the several types of surface irrigation systems and water supply conditions.

Technical Abstract: Practical, automatic real-time control of surface irrigation faces several difficult constraints. Most surface irrigation water supplies must be scheduled in advance and use must be coordinated with other demands. Either the supply systems must be able to adapt to the occasional demand of automatic systems, or the application systems must communicate their needs to the supply system with the required lead time. Surface irrigation performance depends strongly on soil surface and infiltration characteristics. These parameters normally vary widely spatially and from irrigation-to-irrigation, and are difficult to predict. Performance monitoring and system adjustment is usually required to insure good performance, especially during early season irrigations. Automatic real-time control systems thus must include some type of performance feed-back control. This paper discusses the severity of these constraints and possible solutions for the several types of surface irrigation systems and water supply conditions.

Last Modified: 7/28/2014