{
 "tool": "gutter-inlet",
 "toolVersion": "1.1.0",
 "methods": [
  "gutter-inlet 1.1.0"
 ],
 "commit": "ab22876",
 "date": "2026-11-04",
 "summary": "20 of 20 cases (78 values) within tolerance against FHWA HEC-22 4th ed. (2024).",
 "note": "Generated by _workspace/tools/hh_verification.mjs from the fixtures; commit = code verified.",
 "cases": [
  {
   "id": "HEC22-E5.1-T",
   "what": "HEC-22 Example 5.1: spread of 1.8 cfs in a uniform gutter (Sx 0.02, SL 0.01, n 0.016)",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 1,
   "maxDiff": "0.33 %",
   "pass": true
  },
  {
   "id": "HEC22-E5.1-Q",
   "what": "HEC-22 Example 5.1: gutter flow at a spread of 8.2 ft",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 1,
   "maxDiff": "0.13 %",
   "pass": true
  },
  {
   "id": "HEC22-E5.2-A",
   "what": "HEC-22 Example 5.2A: flow in a depressed gutter (W 2 ft, a 2 in) at a spread of 8.2 ft",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 3,
   "maxDiff": "1.59 %",
   "pass": true
  },
  {
   "id": "HEC22-E5.2-B",
   "what": "HEC-22 Example 5.2B: spread of 4.2 cfs in the same depressed gutter",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 1,
   "maxDiff": "0.10 %",
   "pass": true
  },
  {
   "id": "HEC22-E7.1-2x2",
   "what": "HEC-22 Example 7.1: 2 ft x 2 ft P-1-7/8 grate on grade (Vo 8.2 ft/s from figure 7.8)",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 3,
   "maxDiff": "1.04 %",
   "pass": true
  },
  {
   "id": "HEC22-E7.1-2x4",
   "what": "HEC-22 Example 7.1: 2 ft x 4 ft P-1-7/8 grate on grade",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 2,
   "maxDiff": "0.80 %",
   "pass": true
  },
  {
   "id": "HEC22-E7.2-A",
   "what": "HEC-22 Example 7.2A: 9.84 ft curb opening on grade, no depression",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 3,
   "maxDiff": "0.70 %",
   "pass": true
  },
  {
   "id": "HEC22-E7.2-B",
   "what": "HEC-22 Example 7.2B: the same curb opening with a 1 in local depression 2 ft wide",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 5,
   "maxDiff": "0.88 %",
   "pass": true
  },
  {
   "id": "HEC22-E7.3",
   "what": "HEC-22 Example 7.3: curb-opening length for 100% interception with a 2 in local depression",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 2,
   "maxDiff": "0.43 %",
   "pass": true
  },
  {
   "id": "HEC22-E7.4",
   "what": "HEC-22 Example 7.4: sweeper combination, 9.84 ft curb opening ahead of a 2 ft x 2 ft curved vane grate (Vo 6 ft/s)",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 3,
   "maxDiff": "2.62 %",
   "pass": true
  },
  {
   "id": "HEC22-E7.6-U",
   "what": "HEC-22 Example 7.6: 8.2 ft curb opening in a sag, no depression, depth T Sx = 0.164 ft (weir)",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 1,
   "maxDiff": "1.07 %",
   "pass": true
  },
  {
   "id": "HEC22-E7.7-W",
   "what": "HEC-22 Example 7.7: 12 ft slotted inlet in a sag at 3.6 in depth (weir)",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 1,
   "maxDiff": "0.11 %",
   "pass": true
  },
  {
   "id": "HEC22-E7.7-O",
   "what": "HEC-22 Example 7.7: 9.6 ft slot, 1.75 in wide, as an orifice at 3.6 in depth",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 1,
   "maxDiff": "0.47 %",
   "pass": true
  },
  {
   "id": "HEC22-7.9",
   "what": "HEC-22 Example 7.9: two 2 ft by 3 ft P-1-7/8-4 grates down a grade, bypass of the first carried to the second",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 7,
   "maxDiff": "1.77 %",
   "pass": true
  },
  {
   "id": "HEC22-7.9-Q",
   "what": "HEC-22 Example 7.9: Rational Method flow added at the two inlets",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 2,
   "maxDiff": "1.05 %",
   "pass": true
  },
  {
   "id": "ARITH-RUN-CURB",
   "what": "Three 10-ft curb openings, 1.5 + 1 + 1 cfs added: flow, spread, interception and bypass at each",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 12,
   "maxDiff": "0.00 %",
   "pass": true
  },
  {
   "id": "ARITH-RUN-CLOG",
   "what": "The same run with a 50 percent clogging allowance: half of each interception moves to the next inlet",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 12,
   "maxDiff": "0.00 %",
   "pass": true
  },
  {
   "id": "ARITH-RUN-SAG",
   "what": "The same run ending at a 10-ft curb opening in a sag, weir flow",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 15,
   "maxDiff": "0.00 %",
   "pass": true
  },
  {
   "id": "ARITH-RUN-SAG-CLOG",
   "what": "The same sag inlet 50 percent clogged: the opening acts as 5 ft",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 2,
   "maxDiff": "0.00 %",
   "pass": true
  },
  {
   "id": "ARITH-RUN-EMPTY",
   "what": "No inlets: refused",
   "reference": "FHWA HEC-22 4th ed. (2024) (published example)",
   "compared": 1,
   "maxDiff": "both refuse",
   "pass": true
  }
 ]
}