Aqueducts and canal viaducts Arch bridge

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in locations necessary span wide gap @ relatively high elevation, such when canal or water supply must span valley. rather building extremely large arches, or tall supporting columns (difficult using stone), series of arched structures built 1 atop another, wider structures @ base. roman civil engineers developed design , constructed highly refined structures using simple materials, equipment, , mathematics. type still used in canal viaducts , roadways has pleasing shape, particularly when spanning water, reflections of arches form visual impression of circles or ellipses.








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