{
  "type": "minecraft:clamp",
  "input": {
    "type": "minecraft:add",
    "argument1": 0.1,
    "argument2": {
      "type": "minecraft:mul",
      "argument1": 0.2,
      "argument2": {
        "type": "minecraft:noise",
        "noise": "tectonic:underground_river/density_additive",
        "xz_scale": 0.7,
        "y_scale": 0.05
      }
    }
  },
  "min": 0.0,
  "max": 0.2
}