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,
The Way to the Sea The Way to the Sea The Way to the Sea is a 1936 documentary film about the London to Portsmouth railway line (what is now known as the Portsmouth Direct Line) and its recent electrification. This is prefaced with an historical representation of Portsmouth and the London to Portsmouth road (known in the Roman era as Ermin Street and Stane Street). It was produced by the Strand Film Company. Its music was written by Benjamin Britten and its commentary by W. H. Auden, who also wrote the music and words respectively for the similarly themed "Night Mail" that year. The