{
  "feature": "%s",
  "placement": [
    {
      "count": 1,
      "type": "minecraft:count_on_every_layer"
    },
    {
      "type": "minecraft:surface_water_depth_filter",
      "max_water_depth": 8
    },
    {
      "predicate": {
        "offset": [
          0,
          -1,
          0
        ],
        "blocks": "%s",
        "type": "minecraft:matching_blocks"
      },
      "type": "minecraft:block_predicate_filter"
    }
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}
