Hydraulic Structures: Fourth Edition

10.1.3 Superpassage

In this type of cross-drainage work, the natural drain runs above the canal,
the canal under the drain always having a free surface flow. The superpas-
sage is called a canal siphon or simply an inverted siphon if the canal bed
under the drain is lowered to accommodate the canal flow, which will

AQUEDUCTS AND CANAL INLETS AND OUTLETS 419

Fig. 10.1 Layout of an aqueduct