Raglan, New Zealand low-tide area of , 2–4 m tidal range, with a spring-tide range of 2.8 m and neap 1.8 m, spring tide flow around 46 x 10 m and neap 29 x 10 m. A 2005 survey said on average water stays in the harbour 1.1 days at spring-tides, but a 2015 study showed a median residence time for whole estuary of 39.4 days with median river flows, ranging between 18 and 45 days. It is the northernmost of three large inlets in the Waikato coast (the others, also drowned river valleys, are Aotea Harbour and Kawhia Harbour). 15 significant rivers
Issues relating to biofuels Issues relating to biofuels There are various social, economic, environmental and technical issues with biofuel production and use, which have been discussed in the popular media and scientific journals. These include: the effect of moderating oil prices, the "food vs fuel" debate, poverty reduction potential, carbon emissions levels, sustainable biofuel production, deforestation and soil erosion, loss of biodiversity, effect on water resources, the possible modifications necessary to run the engine on biofuel, as well as energy balance and efficiency. The International Resource Panel, which provides independent scientific assessments and expert advice on a variety of resource-related themes, assessed the issues