Water Resources Systems Planning and Management - Simulation models

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This collection includes demonstration versions of two river basin simulations models and their documentation (WEAP and RIBASIM).

To view and download the simulation models, click HERE.

The Water Evaluation and Analysis Program (WEAP) is from the Stockholm Environmental (Tellus) Institute in Boston Massachusetts, USA ( and RIBASIM is from Delft Hydraulics ( in Delft, the Netherlands. The RIBASIM item contains a readme file with additional information and several examples.

In the word file "Example River Basin DSS" an overview of several generic river basin models is given. The users manual of WBalMo from WASY GmbH ( in Berlin, Germany, is included. The demonstration version of this model can be downloaded from the Internet. The full version of Modsim.dss from Colorado State University ( is available free for downloading from the Internet.


Recent Submissions

Now showing 1 - 4 of 4
  • Item
    WBalMo Software Installation and User's manuals
    Loucks, Daniel P. (WASY Ltd., 2003)
    WBalMo (Water balance Model) is an interactive simulation system for river-basin management. These manuals were distributed with the UNESCO produced "Water Resources Systems Planning and Management" by Daniel P. Loucks and Eelco van Beek.
  • Item
    WEAP ("Water Evaluation And Planning" system)
    Loucks, Daniel P. (UNESCO, 2005)
    WEAP ("Water Evaluation And Planning" system is a user-friendly software tool that takes an integrated approach to water resources planning. Freshwater management challenges are increasingly common. Allocation of limited water resources between agricultural, municipal and environmental uses now requires the full integration of supply, demand, water quality and ecological considerations. The Water Evaluation and Planning system, or WEAP, aims to incorporate these issues into a practical yet robust tool for integrated water resources planning. WEAP is developed by the Stockholm Environment Institute's Boston Center at the Tellus Institute. For more information check out the web site: Included here is a ZIP file of the WEAP system.
  • Item
    RIBASIM Version 6.33.13 : River Basin Simulation Model
    Loucks, Daniel P. (UNESCO, 2005)
    This contains the README.txt file for Ribasim system. Also a ZIP file containing the contents of the cd of RIBASIM containing 3 sets of Setup executables each stored in a separate directory : (1) Directory "PROGRAMS" contains all programs and program related files. The windows files will always be stored in the windows system directory... (2) One or more directories "DATA" containing all data for some example basins incl maps... (3) Directory "Manuals" contains the Ribasim User's manual and Technical Reference manual in Pdf-format which you can print with the Acrobat Reader free software for viewing and printing Adobe PDF files. You can download this software from internet site : (4) Directory "License files" contains the license file(s) which belong to your hardware key(s) If the license file License.dat is missing then RIBASIM runs in the "No license" mode which means that you can use RIBASIM only for limited network schematizations... (5) Various directories with Ribasim information and Ribasim basin applications.
  • Item
    Examples Decision Support Systems for River Basin Simulation
    Loucks, Daniel P. (UNESCO, 2005)
    The following are programs designed to simulate water development and management policies in river basins. They are generic in that they are designed to be applicable to a wide variety of specific river basin water resource system configurations, institutional conditions, and management issues. Each of these example programs is based on a nodelink network representation of the water resource system being simulated. Some include optimization that replaces a more detailed representation of operating policies. All contain menudriven graphics based interfaces that facilitate user interaction. These programs are appropriate for use in shared vision exercises involving stakeholder involvement in model building and simulations. The brief descriptions below have been taken from the model web pages.
All material can be used and reproduced freely, where appropriate referring to the source of the material