water gauge derived

{
  "input": {
    "type": "http",
    "method": "GET",
    "queryParams": {
      "site": "01646500"
    }
  },
  "output": {
    "type": "json",
    "errors": {
      "400": {
        "example": {
          "error": "site parameter required"
        },
        "description": "Invalid or missing parameter(s) — required: site. Returned before the payment gate on paid requests, so a malformed call is never charged. JSON body: { error: <what is wrong and how to fix it> } plus usage hints."
      },
      "402": {
        "description": "Payment required — x402 v2 challenge; the accepts array lists scheme, network, and amount. Retry the same request with a PAYMENT-SIGNATURE (v2) or X-PAYMENT (v1) header. Verification is free."
      },
      "500": {
        "example": {
          "error": "upstream_failed"
        },
        "description": "Unexpected server error. If a payment settled without a usable result, contact info@theaslangroupllc.com with the settlement tx hash for a re-run or credit."
      }
    },
    "example": {
      "site": {
        "code": "01646500",
        "name": "POTOMAC RIVER NEAR WASH, DC LITTLE FALLS PUMP STA",
        "latitude": 38.9498,
        "longitude": -77.1276
      },
      "readings": [
        {
          "unit": "ft3/s",
          "max7d": 5210,
          "min7d": 3890,
          "latestValue": 4420,
          "parameterCd": "00060",
          "variableName": "Streamflow, ft³/s"
        }
      ],
      "deterministic": true
    }
  }
}