The channel around Throney and Hayling Islands, which was around  long, was passable even at low spring tides, although parts needed some extra dredging. A second  pumping engine supplied the Portsea Canal from a deep freshwater well, but saltwater entered the canal and contaminated some drinking water supplies, so again, compensation had to be paid.
The channel around Throney and Hayling Islands, which was long, could be navigated even during low spring tides, although some parts needed dredging. A second pump supplied the Portsea Canal with freshwater from a deep well, but saltwater seeped into the canal and contaminated drinking water supplies, requiring further compensation.