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,
Skyline-to-the-Sea Trail Basin park headquarters. It then descends through Big Basin, following Waddell Creek to its outlet at Waddell Beach. Santa Cruz Metro routes 35 and 40 formerly went from Big Basin State Park Headquarters to Waddell Creek and back. Since September 2011 Route 40 no longer goes all the way to Waddell Beach from mid-December to mid-March. but instead turns around at Cement Plant Rd. Route 35 only stops at the Headquarters on the weekends during the Spring/Summer season. There is a proposed plan for a "Saratoga-to-the-Sea" Trail. The plan would create a trail starting somewhere near Hakone Gardens in Saratoga,