A harbour seal looks out of the water at Fisherman's Wharf in Victoria on Thursday, March 10, 2016. Photograph By DARREN STONE, Times Colonist

A harbour seal looks out of the water at Fisherman’s Wharf in Victoria on Thursday, March 10, 2016. Photograph By DARREN STONE, Times Colonist

Tides and the many streams that flow into Victoria’s harbour influence its hydrology. Tides are the periodic rise and fall of the water follow a rhythmic daily pattern that has a profound effect on ecosystems, navigation and harbour construction.

More on hydrology to come