dhymod-link 1.0.3

Convert D-HYDRO output to iMOD ISG

D-HyMOD Link

D-HyMOD Link is a Python package that links D-Hydro and iMOD. This tool converts D-Hydro output to iMOD input (isg).

The initial version was developed by Haskoning for Waterschap Brabantse Delta and further enhanced by Waterschap Aa & Maas. In 2025, the tool was open-sourced with support from Waterboard De Dommel.

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Features

• Export D-Hydro models to ISG format, supporting segments, cross-sections, and water levels at calculation points (time series).
• Read both D-Hydro and ISG formats into a standardized format (STF), which can be edited in GIS and exported to ISG.

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ISG Support

The tool generates ISG files without surface-flow routing (ASFR=0). Supported parameters:

Parameter	Description	Source
Water level	Water level at the calculation node for the defined period	D-Hydro model
Bottom level	Bottom level at the calculation node	D-Hydro model
Resistance	River bed resistance at the calculation node (days)	Manual input
Inf.factor	Infiltration factor at the calculation node (-)	Manual input
mrc	Manning’s Resistance Coefficient for the cross-section (-)	Manual input

Note: Q-H relationships and structures are not supported.

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Notes

• The code has been tested on a limited set of D-Hydro models. Please validate the output before use.
• If you need additional functionality, create a branch and propose a solution via GitHub.
• For bugs, please create an issue (and, if possible, a proposed fix).
• The tool depends on hydrolib-core. Unsupported model versions may cause errors.

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Installation & Usage

• Install via pip:

  pip install dhymod_link
  

• Documentation in the example notebook: examples folder demonstrates reading a D-Hydro model and exporting to ISG.

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Changelog

Version 1.0.2

• Rename tool to D-HyMOD Link

Version 1.0.0

• First release
• Minor textual improvements

Version 0.4.0

• Removed hydrolib-core dependency

Version 0.3.3

• Published open source under GPL v3 license
• Added pip installation support
• Added example notebooks
• Migrated environment file to pyproject.toml and updated dependencies
• Improved aggregation of water levels over defined periods

Version 0.2.0

• Updated environment and hydrolib-core version (Python < 3.12, tested with 3.11.6)
• Required pydantic = 1.10 for hydrolib-core compatibility
• New environment file: environment - new HL.yml
• Improved snapping of calculation points to waterlines using buffer + spatial join (sjoin), replacing ckdnearest
• Added aggregation window option for final calculation period (e.g., "1D" for last day, with "mean" or "min" aggregation)
• Default: 1-day window, mean aggregation

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Contact

Product Owner

• [e-mail]