Geohazards
Because the island is composed partly of glacial silt brought down by the Fraser River, there is a fear of liquefaction of its sands if a strong-enough tremor were to shake it. In such an eventuality, it is anticipated that large portions of it would slide west into the Strait of Georgia, causing incalculable destruction.
The island is also fully diked to protect it from potential flooding during the annual spring freshet on the Fraser. Some of the island is below sea level, and river level, and there is an extensive drainage and pumping system to prevent flooding during heavy rain.
Read more about this topic: Lulu Island