CRIWAR 2.0 calculates the crop irrigation water requirements of a cropping pattern in an irrigated area. The crop irrigation water requirement consist of two components: potential evapotranspiration, ET,, minus the effective precipitation, P,. The input data of CRIWAR 2.0 are organized through three files; a general data file on the irrigated area, a meteo data file and a cropping pattern file. The cropping pattern file can be composed of 50 CRIWAR programmed crops and of any user defined crop. For a user-selected combination of general data, meteo data and cropping pattern, CRIWAR creates tables and graphs giving; reference evapotranspiration, crop irrigation water requirements per 1 0-day period or month, cropping intensity, cropping pattern, effective precipitation, etc. All tables and graphs can be imported into commonly used word-processing software. Following the 'user manual' part of this book (Chapters 2 through 4), this manual gives theory and information on evapotranspiration (Chapter 5), effective precipitation (Chapter 6), capillary rise (Chapter 7) and how to transfer the crop irrigation water requirements into the irrigation water requirements of an irrigation command area (Chapter 8).
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