EEMS 12.5 Release Notes

Release Date: 2026-06-12

EFDC+ Explorer

QUICKEST Constituent Advection

Grid Generation Enhancements

Significantly improved telescoping grid generation.
Added rotation support to uniform grid generation.
New grid parameters are now retained in memory for reuse during iterative grid generation.
New grid settings are automatically saved to the #analysis folder when the model is saved.

2D Interpolation / Assignment (frmInterp2D)

Refactored 2D data interpolation and averaging for substantially faster processing.
Improved high-resolution data averaging when assigning to grid cells.
2D high-resolution assignment now preserves existing cell values when no new data is available, rather than overwriting them.
Added drag-and-drop support for point datafiles and polygon files directly into the form.
Made interpolation and assignment functions behave consistently across modes.

Drag and Drop / Image Handling

Overlay layers and georeferenced images can now be added via drag-and-drop.
Improved loading of large georeferenced images, with automatic downsampling in EE.

Improved project layout save/load reliability.
Widened the save/load layout form for better usability.
New model control forms no longer fully overlap and use an increased cascade offset.
Fixed the greyed-out application taskbar icon at startup.
Fixed MDI child windows incorrectly maximizing when switching between windows.
Fixed cell border artifacts when surface-layer opacity is reduced.
Fixed pan behavior for 2DH models.
Labels no longer display while loading a file.

Fixed an off-by-one error when redistributing withdrawal/return and jet-plume layers.
Fixed an SGZ layering issue.
Fixed a Vegetation Profile (VP) issue and VP plotting for cells with only two layers.
Set HMIN to a consistent value of 0.01 m across EEMS.
Fixed uninitialized m_KL when changing layering for IGRIDV = 0.
Fixed a crash during Horizontal Turbulence initialization.
Fixed velocity reporting for 2DV.
Fixed reading of Open Boundary Conditions using differing pressure series within a single group.
Improved 2DH cell properties copy.
Fixed UTMZone handling when loading polygons in GridGen and other UTMZone issues.
Fixed background and mosaic tile refresh when zooming.

QUICKEST Transport Scheme

Added a new higher-order advection scheme for scalar transport, implementing the QUICKEST (Quadratic Upstream Interpolation for Convective Kinematics with Estimated Streaming Terms) algorithm. W-direction flux further refined in a follow-up update.

Input echoing to EFDC.OUT — Significantly expanded parameter echoing to improve run traceability and reproducibility.
Snapshot count reporting — Improved reporting of the number of output snapshots in EFDC.OUT.
Silica SA predation fraction — Added reading of the silica surface-area predation fraction parameter in the water quality module.
UV/VU advancement in 2TL — Minor fix to UV and VU advancement in the 2-time-level solver.
Small corrections and cleanup in the water quality module.

MPI water quality initialization — Fixed reading of wqici in MPI parallel runs.
Propwash without sediment transport — Fixed a crash/incorrect behavior when propwash is active but sediment transport is disabled.
Default HMIN — Changed the default minimum water depth (HMIN) to 0.01 m to improve stability for shallow-water applications.
Minimum bed thickness (HBEDMIN0) — Made HBEDMIN0 a global variable initialized to 1e-8 and added a guard to prevent use of unrealistically small bed thicknesses in contaminant calculations.