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The history of Wadiso spans a considerable number of years. The basic numeric algorithm in solving the set of loss and continuity equations was developed in the mid 1970’s at Colorado State University, Fort Collins, Colorado (USA). The algorithm was specifically designed for the use on personal computers, with special emphasis on minimizing computer time. In the early 1980’s, the program was expanded to allow experimentation on optimization. At this point in time, the US Army Corps of Engineers Waterways Experiment Station became interested in the project, and sponsored the completion at Colorado State University, of what became known as Wadiso. In 1985, steady state analysis and optimization became operational. In 1986, extended time simulation was added.

 

Wadiso SA Versions 2 (1989) and 3 (1992) were DOS-based programs, and represented a major extension of Wadiso, with numerous additions, which included:

•metric units, in addition to imperial units;

•the Darcy-Weisbach head loss equation, in addition to the Hazen-Williams head loss equation;

•more efficient programming code to model pressure reducing and check valves (about twice as fast);

•the ability to simulate flow control valves;

•improvements in the efficiency of the standard optimization;

•the inclusion of tank cost in the optimization as an additional option;

•graphical display of input data;

•graphical display and interpretation of results; and

•spreadsheet type editors for input and editing of data.

 

Wadiso SA Version 4 was developed specifically for the Windows environment, and in the process, further additions and enhancements were included, for instance:

•an environment (CADGraphics) similar to a CAD program, for input, editing, and viewing of the system and results;

•water quality simulation (through the incorporation of the EPANet program); and

•extension of databases.

 

The previous Wadiso version 5 included the following enhancements:

•A complete CAD system is built into Wadiso to provide an ideal environment for graphical editing and viewing of the system/results.

 

In the process of designing these additions, many minor improvements were made, which make Wadiso even more convenient to use. These additions and modifications were based on feedback from the numerous users of Wadiso worldwide.

 

While the 1985 and 1986 versions of Wadiso were public domain programs, Wadiso is a proprietary program, developed by substantial investment of time and funds. The engineers who were involved in this project are convinced that the end-product is a most valuable tool for the engineer responsible for the design of water distribution systems, and those engineers and managers responsible for operating such systems.