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,
Agreement between Great Britain and Portugal Relating to the Suppression of the Capitulations in Egypt Agreement between Great Britain and Portugal Relating to the Suppression of the Capitulations in Egypt The Agreement between Great Britain and Portugal Relating to the Suppression of the Capitulations in Egypt (1920) was an agreement concluded between the British and Portuguese governments in Lisbon on 9 December 1920, in order to regulate legal relations between Portuguese citizens and the court system in Egypt. Ratifications were exchanged in Lisbon on 29 September 1921 and the agreement went into effect. It was registered in the "League of Nations Treaty Series" on 12 December 1921. The capitulations system had been introduced into the