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Good Arch dam design. (The arch dam is designed so that the force of the water against it, known as hydrostatic pressure, presses against the arch, compressing and strengthening the structure as it pushes into its foundation or abutments. An arch dam is most suitable for narrow gorges or canyons with steep walls of stable rock to support the structure and stresses.[2] Since they are thinner than any other dam type, they require much less construction material, making them economical and practical in remote areas.- Wickypedia)