California Water and Environmental Modeling Forum

Promoting Excellence and Consensus in Water and Environmental Modeling

  Technical Workshop
Integrated Water Flow Model (IWFM)
Version 2015 Training
 (in cooperation with the California Department of Water Resources)

 July 7-9, 2015 from 9:00 to 4:30 pm
West Yost Associates Training Room
2020 Research Park Dr., Suite 100, Davis, CA 95618

Integrated Water Flow Model (IWFM) version 2015 is a water resources management and planning tool that simulates land surface and root zone flow processes, groundwater, stream flows, and surface water-groundwater interactions. Tile drains, subsidence, lakes and lake -groundwater interactions can also be simulated. IWFM models groundwater flow as a quasi three-dimensional system and solves the governing flow equation using the Galerkin finite element method. A unique feature of IWFM is the land use based approach of calculating water demands. Agricultural and urban water demands can be pre-specified, or calculated internally based on user-specified land use distribution, soil properties, climatic conditions and farm water management practices.

This is a companion workshop to the IWFM Demand Calculator (IDC) Version 2015 workshop which is offered separately, and specifically concentrates on the land-surface and root zone component of IWFM. The workshop participants will learn the basic concepts and mathematical methods used in IWFM, and will have hands-on exercises that will teach them how to build models from scratch. The software tools that are developed to aid IWFM users in pre- and post -processing model data and simulation results will also be covered.

Workshop participants will need to bring a laptop computer with several programs installed, including MS Excel 2007, 2010 or 2013, and a powerful text editor such as TextPad. Before the workshop, participants will need to download workshop materials (presentations, hands-on examples and guidelines for these examples) and install the IWFM pre- and post-processor tools.  IWFM Training Schedule and Software Requirements pdf01

Major topics will include:

  • Overview of IWFM-2015
  • Simulation of groundwater flow
  • Stream flows and stream-groundwater interactions
  • Lakes and lake-groundwater interactions
  • Tile drains, subsidence, pumping and recharge of groundwater
  • Land-use and soil moisture routing; comutation of agricuoltural and urban water demands (these topics will be covered only briefly; IWFM Demand Calculator (IDC) Version 2015 workshop covers these topics in more detail)
  • Stream diversions and pumping as water supply
  • Automated adjustment of diversions and pumping to meet water demand
  • Demonstration of pre-processing and post-processor tools