Technical Workshop Integrated Water Flow Model (IWFM) Ver 2015 Training (In cooperation with the California Department of Water Resources)  March 7−9, 2023, 9:00 a.m. to 4:30 p.m. Location: California Natural Resources Head Quarters, 715 P Street, Room 2-302, Sacramento, CA 95814 This workshop is open to CWEMF members only Workshop Fee: $200 or $40 for students (lunch not included) Pre-registration is required; email cwemf@cwemf.org to reserve your seat and include “CWEMF IWFM Training” in the subject line Payment can be made via Credit Card/PayPal at www.cwemf.org or send a check to: CWEMF, P.O. Box 5051, Vacaville, CA 95696-5051

Please go to www.cwemf.org for information on renewing your membership or becoming a member 

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 lakegroundwater interactions can also be simulated. IWFM models groundwater flow as a threedimensional 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 from userspecified 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 (last offered in December 2022) and specifically concentrates on the land-surface and root zone component of IWFM. 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. Workshop participants will need to bring a laptop computer with several programs installed, including MS Excel, 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 Excel add-in.

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; computation of agricultural and urban water demands (these topics will be covered only briefly; the 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