{
  "capability_id": "physics.fluid.hazen_williams",
  "calculation_version": "1.0.0",
  "protocol_version": "1.0.0-proposed",
  "protocol_document_status": "proposed",
  "verification_revision": "2026-09-25.o2-o3",
  "claim_scope": "O2: SI Hazen–Williams vs a separate-module identity (≤2 ULP). Not Darcy, not Colebrook, not Manning, and not Q=Av. ≤2 ULP vs O3 applies only to the published tabulated Hazen–Williams vectors. Not Darcy, not Colebrook, not Manning, and not Q=Av.",
  "oracle": {
    "class": "O3",
    "library": "mpmath 1.4.1",
    "mpmath_dps": 80,
    "backend": null,
    "rounding": null,
    "independent_of_iut": true,
    "generator_id": "hazen-williams-mpmath-o3",
    "generator_version": "1.0.0",
    "generator_sha256": "df759077ab9f449f9b837ddbe7e5ce2ffcf528d2888cb6b9a74eafed6ce44055",
    "table_sha256": "befb28e84c37fbfb0c556a1869dc3f489a280f701674c4b51eafac5f591ae283"
  },
  "result_summary": {
    "passed": 8,
    "total": 8,
    "failed": 0,
    "max_error_ulp": 2,
    "threshold_ulp": 2,
    "max_threshold_ulp": 2
  },
  "public_files": {
    "manifest": "/evidence/physics.fluid.hazen_williams/1.0.0.cvp.json",
    "this_file": "/evidence/physics.fluid.hazen_williams/reproduce.json"
  },
  "vectors": [],
  "disclosure": {
    "policy": "calculatorx-public-evidence-v1",
    "full_validation": "private",
    "representation": "summary",
    "kind": "reproduce"
  }
}