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,
Acts of Parliament of the United Kingdom relating to the European Communities and the European Union Santos [and others]) v Secretary of State for Exiting the European Union". This act legislates to enable the implementation of the country's exit from the European Union (Brexit) and automatically repeals the European Communities Act 1972 on "exit day" – defined in the legislation as 29 March 2019 (at 11.00 p.m.) although until then it remains legally on the statute book with full legal force. Acts of Parliament of the United Kingdom relating to the European Communities and the European Union This is a list of current, amended, spent and repealed Acts of the Parliament of the United Kingdom relating