Model to Evaluate Conservation, Design, and Economic Feasibility of Supplemental Irrigation Systems in the Sub-Humid Region

摘要

The risk of water supply failure for supplemental irrigation systems, where water supply is surface runoff stored in a reservoir, depends upon climate, supply watershed characteristics, the volume of the storage pond and the irrigated crop. In order to assess the joint probabilities involved, a continuous digital irrigation systems analysis and irrigation scheduling model has been developed. The hydrologic model presented consists of a watershed, pond, and one or more irrigation sites. The model generates yield to pond, assesses crop water needs, and actuates irrigation based on soil moisture depletion. Reliability curves for irrigating 57 ha of corn at various locations in eastern Kansas with various sizes of watersheds and reservoir volume are presented. An economic analysis of supplemental irrigation in eastern Kansas is presented.