v2026.1.0-rc2

This second pre-release for v2026.1.0 adds a QGIS plotting pane with water balance and fractional flow plots, a new Observation node, and allocation control for the TabulatedRatingCurve.
We fully switched from Arrow to NetCDF-based I/O, and have a new set of icons for our nodes.

Breaking changes: Arrow support was removed and NetCDF is now the only format for results.
model.to_fews was removed. The Ribasim QGIS plugin now requires QGIS 3.40 or newer.

Added

• Add Observation node. #2950
• Add implicit listen edges to Link table on write. #2949 #2969
• Add a Boolean for allocation-controlled behavior. #2912
• Add allocation-controlled TabulatedRatingCurve. #2907
• Add guide for installing other Ribasim versions. #2906
• Add VS Code guide. #2857
• Add allocation technical reference documentation. #2809
• Add section on debugging unexpected flow rates. #2814
• QGIS: Add experimental QGIS 4 support. #2960
• QGIS: Add configurable RIBASIM_HOME. #2919
• QGIS: Support running Ribasim models. #2881
• QGIS: Load external NetCDF input. #2880
• QGIS: Add Plotly widget and NetCDF results support. #2903
• QGIS: Add water balance plot. #2939
• QGIS: Add fraction plotting. #2968

Changed

• Default to NetCDF for results storage. #2855
• Complete writing remaining results to NetCDF. #2856
• Remove Arrow support. #2937
• Remove model.to_fews; add CF attributes to NetCDF input. #2938
• Introduce Node table at Model level again. #2886
• Use RIBASIM_HOME consistently in tooling and scripts. #2891
• Set default interpolation behavior to block/constant. #2909 #2896
• Set default basin route priority to 0. #2942
• Rename allocation output terminology from realized to supplied. #2962
• Switch between control state and ribasim.allocation. #2808
• Require QGIS 3.40 (LTR) or newer. #2862
• Use new icons for model.plot() and docs. #2917 #2916
• Keep external file paths in Python model handling. #2943
• Add lazy reading and writing in Python. #2878
• Remove migration warnings on model load. #2826

Fixed

• Handle allocation case with zero links. #2959
• Fix default subnetwork ID to 1 in Julia core. #2835
• Skip Junction in route-priority allocation problem building. #2801

All changes

What's Changed

• Pin PythonCall and juliacall to v0.9.31 by @visr in #2795
• Piracy: force has_concretization by @visr in #2796
• Update pre-commit hooks by @evetion in #2798
• Update pixi lockfile by @evetion in #2799
• skip junction in route priority allocation problem building by @verheem in #2801
• Fix typos and grammar errors in documentation by @Copilot in #2807
• Add technical reference docs by @verheem in #2809
• Replace cascading polder example by @verheem in #2811
• Add section on debugging unexpected flow rates by @visr in #2814
• Use Julia 1.12 and Pkg workspaces by @visr in #2815
• Update Julia manifest by @evetion in #2816
• Update pre-commit hooks by @evetion in #2818
• Update OrdinaryDiffEq by @visr in #2817
• Update pixi lockfile by @evetion in #2819
• Use Runic as Julia formatter by @visr in #2821
• Fix invalid binding errors reported by JETLS. by @visr in #2822
• Update AppxManifest.xml by @evetion in #2820
• Enable more ruff rules, and fix violations by @visr in #2823
• Use older runic pre-commit hook by @visr in #2825
• Stop threading by @visr in #2824
• Remove all migration warnings on model load by @visr in #2826
• Address Python test warnings by @visr in #2827
• Fix CLI threading logic by @visr in #2828
• Update PkgToSoftwareBOM requirement to 0.1.17 in /core by @dependabot[bot] in #2829
• Add compat for root-only deps, run dependabot on root by @visr in #2834
• fix default subnetwork id to 1 at Julia side by @verheem in #2835
• Switch between control state and ribasim.allocation by @verheem in #2808
• Update pixi lockfile by @evetion in #2847
• Switch from PackageCompiler to JuliaC without trimming by @visr in #2761
• Improve version mismatch docs and logging by @visr in #2849
• No convergence on ubuntu by @verheem in #2812
• Uncomment "netcdf dimensions" tests by @visr in #2854
• Add VSCode guide by @visr in #2857
• Various doc improvements by @visr in #2858
• Fix QGIS UI test script by @visr in #2861
• Update Julia manifest by @evetion in #2865
• Run all tests models with allocation by @verheem in #2810
• Require QGIS 3.40 (LTR), take 2 by @visr in #2862
• QGIS: Remove vendored tomllib by @visr in #2866
• Complete writing remaining results to net cdf by @verheem in #2856
• Bump prefix-dev/setup-pixi from 0.9.3 to 0.9.4 by @dependabot[bot] in #2872
• Update pixi lockfile by @evetion in #2871
• Update pre-commit hooks by @evetion in #2870
• Update rust edition and dependencies by @visr in #2873
• MSIX: Add AppListEntry="none" by @visr in #2874
• Test reading NetCDF files from Delft-FEWS by @visr in #2859
• default to netCDF format for results storage by @verheem in #2855
• Update Julia manifest by @evetion in #2877
• Enhance documentation and support for NetCDF format in Ribasim API by @verheem in #2876
• Switch from pre-commit to prek by @visr in #2882
• Implement "Run Ribasim model" context menu by @visr in #2881
• Introduce Node table at Model again. by @evetion in #2886
• Use RIBASIM_HOME everywhere by @visr in #2891
• Update from Julia 1.12.4 to 1.12.5 by @visr in #2895
• Update pixi lockfile by @evetion in #2897
• Update Julia manifest by @evetion in #2898
• Exit QGIS better in Docker test by @visr in #2893
• [Python] Lazy reading and writing. by @evetion in #2878
• Add icon generator script + input file in util by @Fati-Mon in #2890
• change results documentation to netcdf format by @verheem in #2894
• Load NetCDF input in QGIS by @verheem in #2880
• Update UsedIds for node/link removal. by @evetion in #2902
• default interpolation types from linear to constant by @verheem in #2896
• Test logging extra info by @visr in #2904
• Default-to-block-interpolation by @verheem in #2909
• QGIS: Support NetCDF results, add Plotly widget by @visr in #2903
• Embed new node icon SVGs into NodeStyle.qml by @visr in #2916
• Use the new icons for model.plot() and docs by @visr in #2917
• Allocation controlled TabulatedRatingCurve by @verheem in #2907
• Add guide for installing other versions of Ribasim by @verheem in #2906
• QGIS: add configurable Ribasim home by @visr in #2919
• Update pixi lockfile by @evetion in #2921
• QGIS timeseries: subplot per unit by @visr in #2926
• Remove global workload preference by @visr in #2928
• Switch to default check-bounds by @visr in #2927
• Docs: overwrite run_ribasim by @visr in #2929
• A Boolean for allocation controlled by @verheem in #2912
• Fix dimensional ordering of concentration results. by @evetion in #2931
• Remove model.to_fews, add CF attrs to netcdf input by @visr in #2938
• [Python] Make sure filepaths are kept for external files. by @evetion in #2943
• default basin route prio to 0 by @verheem in #2942
• Document and automate Runic installation by @visr in #2945
• remove arrow support by @verheem in #2937
• Add implicit listen edges to Link table on write by @visr in #2949
• Add Observation node by @visr in #2950
• Add CLI logo by @evetion in #2932
• Update pixi lockfile by @evetion in #2955
• Bump actions/upload-artifact from 6 to 7 by @dependabot[bot] in #2956
• QGIS: bundle plotly.js by @visr in #2954
• Add experimental QGIS 4 support by @visr in #2960
• catch case with zero links by @verheem in #2959
• stabilize transient pump outlet test by @verheem in #2961
• realized to supplied in allocation by @verheem in #2962
• Align concentration output tables by @verheem in #2963
• fix bound error in OrdinaryDiffEQ and update dependencies by @verheem in #2947
• Remove Arrow and CodecZstd Julia dependencies by @Copilot in #2965
• Update Python testing configuration for pytest integration by @verheem in #2966
• Update pixi lockfile by @evetion in #2967
• Update Julia manifest by @evetion in #2920
• QGIS: plot fractions by @visr in #2968
• Prepare for release v2026.1.0-rc2 by @visr in #2970
• Implicit-listen-edge-follow-up by @verheem in #2969

Full Changelog: v2026.1.0-rc1...v2026.1.0-rc2