{
  "particles_per_run": 500000,
  "seeds": [
    201,
    202,
    203
  ],
  "rainfall_mm": [
    0,
    0.5,
    2,
    5,
    10,
    20,
    40
  ],
  "rain_downward_speed_m_s": 5.0,
  "rain_horizontal_speed_m_s": 3.0,
  "initial_dust_mg_m2_per_face": 100.0,
  "strongly_bound_fractions": {
    "loose_dominated": 0.2,
    "adhered_dominated": 0.7
  },
  "loose_washoff_per_mm": 0.25,
  "bound_washoff_per_mm": 0.015,
  "coefficient_multipliers": [
    0.5,
    1.0,
    2.0
  ],
  "module_area_m2": 2.42,
  "convergence_particles": 2000000,
  "scope": "Hypothetical event scenarios, not measured coefficients. Rain amount is horizontal-gauge depth. Prescribed ballistic water parcels, then two-pool exponential removal per module face. No wet-dry cementation kinetics, CFD, runoff film, splashing, rainborne dust, optical loss or annual energy coupling. Uniform initial dust is a controlled comparison, not output of the dry pilot.",
  "study_revision": "v0.7",
  "clearance_m": 0.3,
  "clear_gap_m": 2,
  "site_conditions": {
    "weeds_present": false,
    "snow_present": false
  }
}