WaterSim 5.0

The Decision Center for a Desert City announces the release of a new version of WaterSim. WaterSim 5.0 represents an adaptation and upgrade of WaterSim 4.0 for stakeholders, researchers and educators.

The current version incorporates the water portfolios for 33 water providers that vary in size from small municipalities to major metropolitan communities. WaterSim 5.0 runs on an annual time-step where simulations can be interrupted annually by the interface enabling runtime changes to policy levers or input specifications. Model downloads and documentation can be found in related sub-directions on this site.


WaterSim 3.0, implemented in Powersim is the version used for WaterSim on the Web. This version was developed to analyze the potential effects of future climatic conditions, population growth, land-use change, and policy options on water supply and water demand for Maricopa County, Arizona. Gober et al. (2011) used the model to examine potential climate change impacts on residential consumptive use under various climate change and policy-driven scenarios. Annual outputs from the model generally focus on the total amount of groundwater drawdown over a simulation period and gallons per capita per day (GPCD) forecast for residential users at the metro-wide scale.

The Decision Theater and the Web Version of WaterSim were developed in PowerSim. This allowed development in a visual model building tool, but this limited use of the model and to some extent its complexity. Version 4.0 of the model was rebuilt in a Fortran model.

Version 5.0

Version 5.0 includes modifications to the Fortran to expand the number of urban water system components with a C# application interface that makes the model usable by anyone using a Windows .Net platform. This version of the model includes spatially explicit system urban system models for 33 of the water providers within the region that allows systems and policy modeling of each water provider. Working with local water resource manager the model was developed with a number of system and water resource management options not implemented in the PowerSim version. The provider urban models include groundwater, surface water, wastewater, reclaimed water, banked water, and aquifer recharge.

There is currently no visual interface to this model. An application programming interface (API) that can be used with Visual Basic or C# in a .Net managed framework is provided. This API provides access to read and set model parameters, run the model in year increments, and output model results into a database. Assemblies for the interface and a DLL for the model are provided. Source code for an application that implements a simplified visual interface to the model is provided as an example of using the API.


Would you like to be informed of updates? Contact David Sampson or Ray Quay. Questions and comments are welcome.

WaterSim: Dr. David A. Sampson
API: Ray Quay