Deltares/Wflow.jl

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Hydrological modeling

Stars: 164
Forks: 33
Open beginner issues: 4
Indexed issues: 129
Avg merge: 2d 19h
Merged PRs (30d): 21

Dominant language: Julia
License: MIT
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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129 open issues indexed

Combining subsurface flow and groundwater flow Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

Deltares/Wflow.jl#1088 · Opened Sep 16, 2026
Reducing θs with depth to improve storativity Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

Deltares/Wflow.jl#1087 · Opened Sep 16, 2026
High resolution (100 m) model: `to_river` very low Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

Deltares/Wflow.jl#1075 · 6 comments · Opened Sep 3, 2026
Align distribution with Ribasim Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

Deltares/Wflow.jl#1069 · Opened Sep 3, 2026
Wflow server: BMI `get_var_units` not working for layered variables Open

bug

Deltares/Wflow.jl#1064 · 1 assignee · Opened Sep 1, 2026
OpenDA: update forcing with netcdf4 Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Deltares/Wflow.jl#1063 · 4 comments · Opened Aug 31, 2026
Publish build artifacts to Sonatype Nexus (raw channel: `wflow_core-releases`) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

Deltares/Wflow.jl#1061 · Opened Aug 27, 2026
Significant differences in model output since v1.0.4 Open

Deltares/Wflow.jl#1050 · 19 comments · 1 assignee · Opened Aug 18, 2026
Improving code efficiency in computing subsurface flow routing Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

Deltares/Wflow.jl#1046 · Opened Aug 13, 2026
Adding weighted average inter-cell to improve vertical transfer of water Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

Deltares/Wflow.jl#1045 · Opened Aug 13, 2026
Improve Docker build pipeline Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

Deltares/Wflow.jl#1043 · Opened Aug 11, 2026
Refactoring Wflow.jl to make it future-proof Open

Deltares/Wflow.jl#1042 · 1 comment · 1 assignee · Opened Aug 11, 2026
Description of the input Vegetation variables needed when Lai data is avaialble Open

documentation

Difficulty 1/5 1-3 hours Newbie friendliness 76/100

Deltares/Wflow.jl#1029 · Opened Jul 30, 2026
The algorithme of vegetation_wood_water__storage_capacity algorithm is not documented Open

documentation

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

Deltares/Wflow.jl#1027 · Opened Jul 30, 2026
Rutter model not accounting for layered vegetation Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

Deltares/Wflow.jl#1026 · Opened Jul 30, 2026
Sync TeamCity settings in repo Open

developer-experience

Difficulty 4/5 3-5 days Newbie friendliness 48/100

Deltares/Wflow.jl#1022 · 1 comment · Opened Jul 28, 2026
subsurface_water__to_river_volume_flow_rate not recognized as an [output.netcdf_grid.variables] Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 65/100

Deltares/Wflow.jl#1018 · 4 comments · Opened Jul 27, 2026
Release v1.1.0 Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

Deltares/Wflow.jl#1016 · Opened Jul 24, 2026
Post release v1.1.0 Open

Difficulty 1/5 Under an hour Newbie friendliness 72/100

Deltares/Wflow.jl#1011 · Opened Jul 23, 2026
Enhance Code Quality 2026 Roadmap Parent Item Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

Deltares/Wflow.jl#999 · Opened Jul 16, 2026
Add libwflow shared library Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

Deltares/Wflow.jl#998 · Opened Jul 16, 2026
Improve SBM hydrological concepts Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

Deltares/Wflow.jl#995 · Opened Jul 14, 2026
test reducer functionality in the test bench Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

Deltares/Wflow.jl#990 · Opened Jul 13, 2026
Docker file with tag v0.7.3 does not result in Wflow v0.7.3 Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 56/100

Deltares/Wflow.jl#980 · 1 comment · Opened Jul 8, 2026
Clarifying single-layer groundwater flow with Ks_y decreasing with depth Open

documentation

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Deltares/Wflow.jl#965 · Opened Jun 30, 2026
Add TOML section to exported variable/parameter metadata Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

Deltares/Wflow.jl#959 · 1 comment · Opened Jun 25, 2026
Check units parameters rainfall erosion model `ANSWERS` Open

Difficulty 3/5 1-2 days Newbie friendliness 50/100

Deltares/Wflow.jl#942 · Opened Jun 15, 2026
Subdivide variable structs into states, derived states, fluxes and intermediates Open

developer-experience

Difficulty 5/5 Over a week Newbie friendliness 35/100

Deltares/Wflow.jl#938 · Opened Jun 10, 2026
Validate input data bounds Open

user-experience

Difficulty 5/5 Over a week Newbie friendliness 35/100

Deltares/Wflow.jl#934 · Opened Jun 8, 2026
output.nc should embed CRS metadata for interoperability Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

Deltares/Wflow.jl#923 · 1 reaction · Opened Jun 1, 2026
Check and fix units rainfall erosion sediment Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

Deltares/Wflow.jl#922 · Opened May 28, 2026
Output of the vertical_saturated_hydraulic_conductivity_profile Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

Deltares/Wflow.jl#910 · 2 comments · Opened May 14, 2026
Replace lens-based variable lookup system by dictionaries constructed at model initialization Open

developer-experience

Difficulty 5/5 Over a week Newbie friendliness 35/100

Deltares/Wflow.jl#903 · Opened May 7, 2026
Separate variables over multiple netcdf files Open

wishlist

Difficulty 5/5 Over a week Newbie friendliness 35/100

Deltares/Wflow.jl#882 · Opened Apr 9, 2026
long computation time large models when going from wflow0.81 to wflow1.02 Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

Deltares/Wflow.jl#879 · 1 comment · Opened Apr 3, 2026
Test wflow_cli build server fails Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

Deltares/Wflow.jl#877 · Opened Mar 31, 2026
Investigate results of `transient_aquifer_1d` function Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

Deltares/Wflow.jl#869 · Opened Mar 18, 2026
Add test writing output from `SVector` elements (probably broken) Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

Deltares/Wflow.jl#864 · 1 comment · Opened Mar 16, 2026
Investigate longer test run times with Julia 1.12 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

Deltares/Wflow.jl#847 · 5 comments · Opened Feb 19, 2026
Notable monthly peaks in land routing balance error Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

Deltares/Wflow.jl#846 · 6 comments · Opened Feb 17, 2026
Add flowchart(s) of model time step Open

developer-experience documentation

Deltares/Wflow.jl#838 · 1 assignee · Opened Feb 9, 2026
Meta issue: developer experience issues Open

developer-experience

Deltares/Wflow.jl#834 · 1 assignee · Opened Feb 3, 2026
Review developer documentation and instructions Open

documentation

Deltares/Wflow.jl#826 · 5 comments · 1 assignee · Opened Jan 20, 2026
Account for nested subcatchments when writing output Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Deltares/Wflow.jl#807 · 1 comment · Opened Jan 8, 2026
Add flow threshold for overland flow Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Deltares/Wflow.jl#806 · Opened Jan 8, 2026
Usage of RutterInterceptionModel for daily timestep Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

Deltares/Wflow.jl#805 · Opened Jan 8, 2026
Support direct insertion of discharge observations as part of river flow routing Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

Deltares/Wflow.jl#804 · Opened Jan 8, 2026
Consider using `DataInterpolations.jl` for `interpolate_linear` Open

computing

Difficulty 4/5 3-5 days Newbie friendliness 30/100

Deltares/Wflow.jl#772 · Opened Nov 28, 2025
Investigate whether memoization can improve performance Open

computing

Difficulty 5/5 Over a week Newbie friendliness 35/100

Deltares/Wflow.jl#763 · Opened Nov 24, 2025
SBM model: soil hydraulic parameters per soil layer Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

Deltares/Wflow.jl#761 · Opened Nov 24, 2025

Deltares/Wflow.jl

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