{
 "tool": "rational-method",
 "toolVersion": "1.0.0",
 "methods": [
  "rational 1.0.0",
  "atlas14 1.1.0"
 ],
 "commit": "ab22876",
 "date": "2026-11-04",
 "summary": "9 of 9 cases (293 values) within tolerance against FHWA HEC-22 4th ed. (2024), NOAA Atlas 14 PFDS, Hand calculation of the published equation.",
 "note": "Generated by _workspace/tools/hh_verification.mjs from the fixtures; commit = code verified.",
 "cases": [
  {
   "id": "HEC22-E4.1-EX",
   "what": "HEC-22 Example 4.1: weighted C, existing conditions (43.3 ac)",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 1,
   "maxDiff": "0.13 %",
   "pass": true
  },
  {
   "id": "HEC22-E4.1-PR",
   "what": "HEC-22 Example 4.1: weighted C, proposed conditions (43.3 ac)",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 1,
   "maxDiff": "0.03 %",
   "pass": true
  },
  {
   "id": "HEC22-E4.3-EX",
   "what": "HEC-22 Example 4.3: Rational Method peak, existing conditions, i = 1.9 in/h",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 1,
   "maxDiff": "0.31 %",
   "pass": true
  },
  {
   "id": "HEC22-E4.3-PR",
   "what": "HEC-22 Example 4.3: Rational Method peak, proposed conditions, i = 2.3 in/h",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 1,
   "maxDiff": "0.06 %",
   "pass": true
  },
  {
   "id": "PFDS-AMS-SanAntonio",
   "what": "San Antonio (29.4241, -98.4936): annual maximum series, 15 durations × 9 recurrence intervals",
   "reference": "NOAA Atlas 14 PFDS (retrieved 2026-11-02)",
   "compared": 135,
   "maxDiff": "0.00 %",
   "pass": true
  },
  {
   "id": "PFDS-SanAntonio",
   "what": "San Antonio (29.4241, -98.4936): partial-duration series, 15 durations × 10 recurrence intervals",
   "reference": "NOAA Atlas 14 PFDS (retrieved 2026-11-02)",
   "compared": 150,
   "maxDiff": "0.00 %",
   "pass": true
  },
  {
   "id": "ARITH-RATIONAL",
   "what": "Rational Method: 6 ac at C 0.85 and 4 ac at C 0.35, i = 5.0 in/hr",
   "reference": "Hand calculation of the published equation (published example)",
   "compared": 2,
   "maxDiff": "0.00 %",
   "pass": true
  },
  {
   "id": "ARITH-RATIONAL-250AC",
   "what": "Rational Method on 250 ac (over the 200-ac limit of FHWA HDS-2 and TxDOT: warning required)",
   "reference": "Hand calculation of the published equation (published example)",
   "compared": 1,
   "maxDiff": "0.00 %",
   "pass": true
  },
  {
   "id": "ARITH-LOGLOG",
   "what": "Depth between two durations: 1 in at 10 min, 2 in at 40 min, read at 20 min",
   "reference": "Hand calculation of the published equation (published example)",
   "compared": 1,
   "maxDiff": "0.00 %",
   "pass": true
  }
 ]
}