The PR adds NWM_PONDED_DEPTH variable to the BMI variables output list. It represents surface water, stored in the GIUH/NASH_Cascade array, that didn't drain during the current timestep. It will be need for NextGen vars parity with NWM variables.

Additions

• Added a BMI output variable

Removals

• None

Changes

• None

Testing

1. All existing tests pass and results are unchanged

Checklist

• PR has an informative and human-readable title
• Changes are limited to a single goal (no scope creep)
• Code can be automatically merged (no conflicts)
• Passes all existing automated tests
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Reviewers requested with the Reviewers tool ➡️