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Wadiso
Background
GIS Compatibility
Model Characteristics
Solutions and Optimization Algorithms
Numeric Balancing Pressures and Flows
Optimization Technique
Water Quality Modelling
SCADA Link
Results Presentation
History of Changes
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Wadiso Background
Wadiso is a comprehensive computer program for the analysis and optimal design of water distribution networks. The program originated from the WADISO public domain model developed by Prof. Johannes Gessler of Colorado State University for the Army Corps of Engineers. Dr Erik Loubser, studying under the mentorship of Prof. Gessler, assisted with the development of a unique system design optimization module of the program. Subsequently a programming team employed by GLS Engineering Software (Pty.) Ltd., the South African based software development company responsible for development and support of Wadiso in South Africa, substantially improved the basic WADISO with regard to user friendliness and speed as well as interfacing with other application software such as water quality analysis, CAD, GIS and management programs. The improved WADISO was subsequently referred to as WADISO SA. During recent years WADISO SA was taken to a new level by the development of a full 32 bit Windows 2000/XP version. The latest edition is again named Wadiso as the name is now a registered trade mark in South Africa. The following is an overview of the features of Wadiso. The program integrates steady state simulation, time simulation, optimization, and water quality analysis with graphical displays of data and results into a single, most valuable tool for water engineers. The latest version of Wadiso, offers four modules for the modeling and analysis of a distribution system: |
Wadiso 2
Wadiso 3
Wadiso 4
Wadiso 5
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Steady State Analysis Module: This is the basic module which allows for the input and editing of system data and parameters, and which calculates the flow and pressure distribution in the system under specific "snapshot" steady state conditions. Full graphical display of flows, pressures, etc. is available. Extended Period Simulation Module: This module allows for modeling of diurnal fluctuations in water demand, and controls of pumps, valves, etc. in order to monitor system performance (e.g. tank level fluctuations, pumping cycles, pressure variations) over an extended period of time. Optimization Module: This unique module allows for the determination of future improvement needs, with the objective being to minimize capital expenditure and present worth of operational costs, while adhering to specified operational criteria. The cost trade-off between pipes and pumping costs, and pipes and storage cost are taken into account for the optimization. Water Quality Modeling. Wadiso includes a seamless interface to the public domain EPANet program for modeling of water quality aspects. Such a seamless interface is possible since EPANet was developed around the balancing algorithm used by the original US Army Corps of Engineers WADISO program (also public domain), and hence uses a very similar data structure.
The Wadiso concepts, both with respect to speed and robustness of the balancing algorithm and cost benefits of the optimization technique, are well known and have been well documented in the literature. The main examples in this regard are:
Gessler (1984) produces a new benchmark optimum solution with WADISO for the New York Aqueduct Tunnels problem. Gessler and WADISO (1985) wins the "Battle of the Network Models" at an ASCE conference in Buffalo NY, producing the most cost-effective solution to the "Anytown, USA" benchmark problem. Loubser, B.F. (1987), after extending WADISO to include storage costs in the optimization technique, improves the "Anytown, USA" benchmark previously set in Buffalo. Sinske, A.N. (1993), rewrites the WADISO tank optimization algorithm to take account of sparse matrix techniques.
Wadiso has been used for distribution system analysis and planning by GLS Consulting and other consultants in more than 100 major applications. Some of the more significant projects are:
Large to medium sized cities for which the distribution systems were modeled in detail, with inclusion of the smallest diameters distribution pipes, are as follows:
Greater City of Ekurhuleni (Gauteng, South Africa) - total of 600 000 stands serviced Greater City of Pretoria (Bulk and reticulation) - total of 560 000 stands serviced Greater City of Cape Town (Bulk and reticulation of most cities) - total of 650 000 stands serviced Greater City of Johannesburg (Bulk and reticulation of most cities) - total of 1 100 000 stands serviced Local municipalities of the Western Cape (Bulk and reticulation of most towns) City of Windhoek, Namibia (Bulk and reticulation) - total of 100 000 stands serviced City of Blantyre, Malawi City of Novokuznesk, Russia City of Vernon B.C., Canada
If you have modeled an interesting place using Wadiso we would love to hear from you! Please contact us.
In all the above cases, the existing system and existing demands were modeled and analyzed, prior to an extension of the model to represent future scenarios. The optimization module of Wadiso was typically subsequently used to establish an economically optimal master plan for existing and future improvement needs of each system.
Studies where the extended period time simulation module of Wadiso was used in particular, with a view to optimization of the operation of a bulk distribution system are as follows:
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