Ocean power in New Zealand speed. Because the tidal speed doubles, eight times more tidal power can be produced at spring tides than at neap tides. The entrance to Kaipara Harbour, one of the largest harbours in the world, is a channel to the Tasman Sea. It narrows to a width of , and is over deep in parts. On average, Kaipara tides rise and fall . At high tide, nearly 1000 square kilometres are flooded. Spring tidal flows reach 9 km/h (5 knots) in the entrance channel and move 1,990 million cubic metres per tidal movement or 7,960 million cubic meters daily. In 2011,
What Happened to Goodbye familiar and inspiring to you". Other critics have described the book as "A tale of self-identity" and as a novel that addresses "how important our identities are" Another important theme in the novel is family relationships. In one review, Pamela Kramer from the Examiner noted that "what the reader learns through Mclean is the importance of family". A reviewer from Galley Smith added that the novel has "many common themes relating to children of divorce and family dynamics". Another important theme in What Happened to Goodbye is friendship. One reviewer stated that "working together on an intricate model of the