International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage



(3580) Shaft and culvert canal spillway, Combined overflow spillway and culvert, Subway, Syphon
A canal spillway formed by a vertical shaft provided near one of the banks of the canal over a canal culvert. The culvert section is enlarged beyond the junction to carry the surplus water (illustrated). In Australian usage, referred to as, `subway` or `syphon`.

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