# Rev1.5 PCSWMM Native Mode

- PCSWMM is the primary simulation backend.
- OpenSWMM verification is optional and defaults to false.
- First and model-only submissions do not require a revision package.
- Revised/final submissions still require baseline/revision evidence for closure.
- PCSWMM-native SWMR DOCX and audit ZIP generation is available without OpenSWMM.
- Full reconciled Rev31 report generation remains available when independent results are present.