{
  "biomes": ["minecraft:river"],
  "bed": ["minecraft:gravel", "minecraft:clay"],
  "waterline": ["minecraft:gravel", "minecraft:clay"],
  "bank": "minecraft:air",
  "waterline_below": 3, "waterline_above": 0,
  "underwater_noise": 0.25, "above_water_noise": 0.15
}