{
 "tool": "regression-peak",
 "toolVersion": "1.0.0",
 "methods": [
  "regression 1.0.0"
 ],
 "commit": "ab22876",
 "date": "2026-11-04",
 "summary": "5 of 5 cases (10 values) within tolerance against USGS SIR 2009-5087, Hand calculation of the published equation.",
 "note": "Generated by _workspace/tools/hh_verification.mjs from the fixtures; commit = code verified.",
 "cases": [
  {
   "id": "SIR-NUECES",
   "what": "USGS example: Nueces River at Laguna, 737 sq mi, P 24.5 in, S 0.00326, OM 0.33: 100-year about 145,000 cfs",
   "reference": "USGS SIR 2009-5087 pp. 16-17, station 08190000 Nueces River at Laguna",
   "compared": 1,
   "maxDiff": "0.24 %",
   "pass": true
  },
  {
   "id": "ARITH-REG",
   "what": "All return periods, 120 sq mi, P 40 in, S 0.002, OM 0.1, from TxDOT HDM table 4-4 as printed",
   "reference": "Hand calculation of the published equation (published example)",
   "compared": 7,
   "maxDiff": "0.00 %",
   "pass": true
  },
  {
   "id": "REG-1MI",
   "what": "TxDOT: not for drainage areas under 1 sq mi (refusal)",
   "reference": "Hand calculation of the published equation (published example)",
   "compared": 1,
   "maxDiff": "both refuse",
   "pass": true
  },
  {
   "id": "REG-URBAN",
   "what": "TxDOT: not for 10 percent impervious cover or more (refusal)",
   "reference": "Hand calculation of the published equation (published example)",
   "compared": 1,
   "maxDiff": "both refuse",
   "pass": true
  },
  {
   "id": "REG-5MI",
   "what": "Below about 5 sq mi the comparison-method warning shows",
   "reference": "Hand calculation of the published equation (published example)",
   "compared": 0,
   "maxDiff": "0.00 %",
   "pass": true
  }
 ]
}