The latest version of the Environmental Fluid Dynamics Code that combines many of the significant advances in EFDC over the past several years into a single powerful model.

EFDC_DSI is a significantly enhanced version of the original EFDC code developed at VIMS. Enhancements made by DSI include dynamic memory allocation, particle tracking, water quality and sediment transport updates, and a host of other improvements.

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EFDC_OMP is the multi-threaded version of the EFDC_DSI model. This version allows the user to take full advantage of every CPU core to dramatically improve model run-times.

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EFDC_SGZ is the most recent major advancement to EFDC. This version significantly reduces the pressure gradient errors in stratified systems by allowing varied layer counts throughout the model domain.

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Release dates

efdc+ will be integrated into every paid version of EFDC_Explorer beginning with EFDC_Explorer8. Our goal is to release the new modeling system by March 1st.

Our goal with this change is to make sure we are providing everyone with the best product we possibly can. This means focusing on a single model for development and making sure it is the best we can offer.

Frequently asked Questions

Have more questions about what this means for you? Take a look at our dedicated FAQ page or email us.

New features include the Sigma-Zed EFDC Model, multi-threading using OMP, enhanced Hydraulic Structures including weirs, culverts and bridges with reverse flow option; East-West Connectors for connecting separate subdomains (in addition to the North-South connectors that were already available), wind map enhancements and many more…

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Modern Intel i5 and i7's as well as Xeon systems all work with EFDC_Explorer. The faster the CPU, the better the run times. efdc+ works on an AMD system, but an Intel system should be used for efficiency gains now that the OMP (multi-threaded) code is implemented. A CPU with as many cores as possible is advised. efdc+ has been regularly used on systems with 32 threads (16 cores) using multiple Xeon chips. The more threads/cores the greater the efficiency in model run times.
Memory is not particularly critical as the memory for the EFDC_DSI model is dynamically allocated and most models take < 250K of RAM. The minimum requirement is four gigabytes though eight gigabytes is recommended.
EE users that have active maintenance and OMP will be eligible to upgrade to EE8 at no additional charge. If you do not have active maintenance and/or OMP, please contact us for your upgrade pricing. Discounts are available for users with older versions of EE who want to upgrade to EE8. Please contact us at ee_sales@ds-intl.biz.
The EFDC_Explorer website has many example models, videos and step-by-step guidance documents to help the user get familiar with the tool.
The default application is 32 bit single precision, though a double precision executable is available. It is compatible on XP, Vista, Win7, Win8, and Win10 in either 32 or 64 bit. The EE/efdc+ modeling system can be used on Linux with a window emulator. efdc+ compiled for Linux is also available as an option.
After EE8 is released, every customer will be able to apply and receive a single trial license for efdc+ & EFDC_Explorer 8 on our website. There will be a maximum of one trial license per customer.
With the release of efdc+ and EE8, DSI is providing trainings, free of charge, with a day dedicated to the new Sigma-ZED features. Please see our training page or contact us at ee_training@ds-intl.biz
Many studies have used EFDC in river, coastal and estuarine systems to better understand the long terms impact of a changing climate. EE is commonly used for comparative studies to look at various scenarios of sea level rise, flooding impacts, sediment erosion and deposition due to changes in morphology and the hydrodynamic regime.

Other studies look at temperature impacts on algal blooms and water quality. Climate change can impact reservoir levels and the availability of water for domestic and industrial use. EFDC has been used for studying these changes in North America and Australia, as well as many studies in China, South Korea, and other countries.

efdc+ can also be used to study alternative energy options such as tidally generated electricity ie MHK (marine hydrokinetics). Structures designed for converting tidal energy to electricity can impact water velocities as well as water quality and sediment transport. efdc+ is a powerful and robust tool for assessing these impacts.

Contact Us

Stay tuned for more major updates coming to the EFDC_Explorer Modeling System!


P.O. Box 1916, Edmonds, WA 98020, USA


(+1) 425-728-8440