"flood stage" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "flood"
      },
      "expansion": "flood",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "stage"
      },
      "expansion": "stage",
      "name": "m"
    }
  ],
  "etymology_text": "flood + stage",
  "forms": [
    {
      "form": "flood stages",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "flood stage (plural flood stages)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "The town flooded when the waters were just three feet over flood stage when the sandbags were washed away in three locations."
        }
      ],
      "glosses": [
        "The elevation at which water overflows the natural banks of a river or other body of water in a given portion of the body of water."
      ],
      "id": "en-flood_stage-en-noun-~R4OcnFY",
      "links": [
        [
          "elevation",
          "elevation"
        ],
        [
          "overflow",
          "overflow"
        ],
        [
          "bank",
          "bank"
        ]
      ]
    }
  ],
  "word": "flood stage"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "flood"
      },
      "expansion": "flood",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "stage"
      },
      "expansion": "stage",
      "name": "m"
    }
  ],
  "etymology_text": "flood + stage",
  "forms": [
    {
      "form": "flood stages",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "flood stage (plural flood stages)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns"
      ],
      "examples": [
        {
          "text": "The town flooded when the waters were just three feet over flood stage when the sandbags were washed away in three locations."
        }
      ],
      "glosses": [
        "The elevation at which water overflows the natural banks of a river or other body of water in a given portion of the body of water."
      ],
      "links": [
        [
          "elevation",
          "elevation"
        ],
        [
          "overflow",
          "overflow"
        ],
        [
          "bank",
          "bank"
        ]
      ]
    }
  ],
  "word": "flood stage"
}