The new locks use water saving basins. https://en.wikipedia.org/wiki/Panama_Canal_expansion_project#Water_saving_basins https://en.wikipedia.org/wiki/Panama_Can

The new locks use water saving basins. https://en.wikipedia.org/wiki/Panama_Canal_expansion_project#Water_saving_basins https://en.wikipedia.org/wiki/Panama_Canal_expansion_project... According to http://www.marinelink.com/news/watersaving-panama-canal404727.aspx http://www.marinelink.com/news/watersaving-panama-canal40472... : > And each [pond] utilizes state-of-the art technology which allows the Canal to reuse 60 percent of the water used per lockage, saving 7 percent more than the existing locks do. Also, the current system requires no power, except to open and close valves. It is expensive to pump water uphill, because water is heavy.