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GET /v1/detention

Detention storage

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10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/runoff-api

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Code snippets

curl "https://api.oanor.com/runoff-api/v1/detention" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/runoff-api/v1/detention", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/runoff-api/v1/detention");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);
import requests
requests.get(
    "https://api.oanor.com/runoff-api/v1/detention",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "note": "First-order detention storage = (Q_in − Q_out) × duration, treating the excess as a constant rate over the storm. Use a routed hydrograph for design; this is a quick upper-bound estimate.",
        "inputs": {
            "duration_min": 30,
            "inflow_peak_m3s": 0.5,
            "allowable_outflow_m3s": 0.2
        },
        "required_storage_m3": 540,
        "required_storage_liters": 540000
    },
    "meta": {
        "timestamp": "2026-06-05T11:30:26.137Z",
        "request_id": "29362af1-0a48-467c-a6d3-2e41ba644439"
    },
    "status": "ok",
    "message": "Detention storage",
    "success": true
}