Abstract
WinSRFR is a software package for the hydraulic analysis of surface irrigation systems. The software can be used to conduct simulations, carry out design and operational analyses, and evaluate performance from field-measured data. Version 3.1 was released in 2009 and a new version, V. 4.1 is scheduled for 2012. This release provides a limited number of analytical enhancements for the end user, but it represents a major software upgrade. The simulation engine, known as SRFR, has been entirely rewritten using modern object-oriented programming concepts. This recoding effort was undertaken to facilitate the continued development of the SRFR code and to provide the application with a well-defined application programming interface. The paper discusses the architecture of the new SRFR engine and the resulting enhancements to the WinSRFR program.

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