Reinfiltration of surface water and flow threshold for overland flow

[JoostBuitink]

Issue addressed

Fixes #237

Explanation

Explain how you addressed the bug/feature request, what choices you made and why.

Checklist

• [x] Updated tests or added new tests
• [x] Branch is up to date with master
• [x] Tests & pre-commit hooks pass
• [x] Updated documentation if needed
• [x] Updated changelog.md if needed

Additional Notes (optional)

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