Barry Docks of leads to the dock basin entrance. The channel has a least depth of , with a depth of at spring tides and at neap tides. At high-water spring tides the depth of water at the entrance to the basin is . At high-water neap tides it is . There are several moorings for yachts and small craft on the west of the tidal basin. The original entrance to the docks is wide, with two wrought-iron gates operated by direct acting hydraulic cylinders. This sea entrance leads into the Basin, (rarely called No.3 dock), that is and covers . At
Issues relating to biofuels ecosystems including rainforest in South America. In forest ecosystems, these effects themselves will undermine the climate benefits of alternative fuels, in addition to representing a major threat to global biodiversity. Although biofuels are generally considered to improve net carbon output, biodiesel and other fuels do produce local air pollution, including nitrogen oxides, the principal cause of smog. 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