sliding gates, doubled for safety, and are long, wide, and deep. This allows the transit of vessels with a beam of up to , an overall length of up to and a draft of up to , equivalent to a container ship carrying around 12,000 containers, each in length (TEU). The new locks are supported by new approach channels, including a channel at Miraflores from the locks to the Gaillard Cut, skirting Miraflores Lake. Each of these channels are wide, which will require post-Panamax vessels to navigate the channels in one direction at a time. The Gaillard Cut and the channel through Gatun Lake were widened to at least on the straight portions and at least on the bends. The maximum level of Gatun Lake was raised from to . Each flight of locks is accompanied by nine water reuse basins (three per lock chamber), each basin being about wide, long and deep. These gravity-fed basins allow 60 percent of the water used in each transit to be reused; the new locks consequently use 7 percent less water per transit than each of the existing lock lanes. The deepening of Gatun Lake and the raising of its maximum water level also provide capacity for significantly more water storage. These measures are intended to allow the expanded canal to operate without constructing new reservoirs. The estimated cost of the project is . The project was designed to allow for an anticipated growth in traffic from 280 million PC/UMS tons in 2005 to nearly 510 million PC/UMS tons in 2025. The expanded canal will have a maximum sustainable capacity of about 600 million PC/UMS tons per year. Tolls will continue to be calculated based on vessel tonnage, and in some cases depend on the locks used. An article in the February 2007 issue of Popular Mechanics magazine described the engineering aspects of the expansion project. There is also a follow-up article in the February 2010 issue of Popular Mechanics. On September 3, 2007, thousands of Panamanians stood across from Paraíso Hill in Panama to witness a huge initial explosion and launch of the Expansion Program. The first phase of the project was the dry excavations of the wide trench connecting the Gaillard Cut with the Pacific coast, removing 47 million cubic meters of earth and rock. By June 2012, a 30 m reinforced concrete monolith had been completed, the first of 46