It was a section of canal wall that had been hollowed out to form a kind of cave.

The packed material showed finger like structures projecting into the tubules from the canal wall.

Stone was used in building the canal walls, buildings and also exported using it.

There are indications that the soft earth and peat underlying canal walls may have given way.

Today the stalls still float on the water but are permanently attached to the canal wall.

Irrigation canals must be lined to prevent the canal walls from caving in.

The idea was that on reaching a canal, wall or other obstacle the tank would stop.

Work continued around the clock to make emergency repairs to damaged canal walls and levees.

As they swept around tight turns, waves broke against the canal walls, buffeting David with the spray.

Public works officials said it may take three days to repair the canal wall.