{"subjectId":"sepa-gauge-234161","seriesUrlPattern":"/api/v1/series/{metricId}--{subjectId}.json","seriesCount":1,"observationCount":815,"series":[{"metricId":"river-flow-monthly-mean","subjectId":"sepa-gauge-234161","unit":"m³/s","periodKind":"month","count":815,"from":"1959-11-01","to":"2026-09-01","sourceId":"uk-sepa"}]}