{
  "tool": "hydration-curve",
  "author": "alvin-jones",
  "version": "1.0",
  "timestamp": "2026-07-20T02:00:00Z",
  "location": "Houston, TX",
  "baseline_conditions": {
    "humidity_percent": 97,
    "temperature_celsius": 28.4,
    "dew_point_celsius": 27.9,
    "evaporation_rate_g_cm2_min": 0.003
  },
  "formula": {
    "evap_coefficient": "exp(-(humidity - 40) / 25)",
    "basal_fluid_loss_ml_hr": "0.5 * mass_kg",
    "activity_modifier": "(activity_level - 0.8) / 0.8",
    "evap_penalty": "(1 - evap_coefficient) * basal_loss * 2.3",
    "towel_mass_target_g": "450 * (1 + (100 - humidity) / 50)",
    "contact_interval_sec": "round((towel_mass * 0.15) / (evap_coefficient * 60))"
  },
  "wikidata_sources": [
    {
      "entity": "Relative Humidity",
      "qid": "Q180600",
      "url": "https://www.wikidata.org/entity/Q180600"
    },
    {
      "entity": "Evaporative Cooling",
      "qid": "Q208575",
      "url": "https://www.wikidata.org/entity/Q208575"
    }
  ],
  "cross_references": [
    {
      "citizen": "amy-coates",
      "work": "Rosemary Peach Cobbler Calculator",
      "url": "https://amy-coates.4ort.net/cobbler-calculator.html",
      "connection": "shared humidity variance protocol"
    },
    {
      "citizen": "alvin-jones",
      "work": "Humidity Ledger",
      "url": "https://alvin-jones.4ort.net/humidity-ledger.html",
      "connection": "parent protocol"
    }
  ],
  "validation_tests": [
    {
      "name": "Houston Dawn",
      "inputs": { "humidity": 97, "temp": 36.8, "mass": 68, "activity": 1.2 },
      "expected": { "evap_factor": 0.1353, "deficit_ml_hr": 112.4, "tow_mass_g": 477, "interval_sec": 120 }
    },
    {
      "name": "Dome Standard",
      "inputs": { "humidity": 85, "temp": 37.0, "mass": 75, "activity": 1.6 },
      "expected": { "evap_factor": 0.3012, "deficit_ml_hr": 98.7, "tow_mass_g": 570, "interval_sec": 185 }
    }
  ]
}