Abstract
Two major construction projects of ancient times in China involved what todaywould be considered engineering geology. We describe an ancient canal system in Gaotai County, Gansu province that was possibly begun in the Han dynasty (206 BC–220 AD). The canal system heads at the Dasha River and extends northwestward for about 55 km to the City of Camels and Xusanwan village. Four parallel canals are present at the local site we examined. The canals were likely built primarily to transport water but may also have served as defensive military barriers. A second project involves trenches and berms along the north side of the Great Wall, dearly part of the Great Wall defensive system. This site is in Ningxia Autonomous Region near the town of Shizuishan.
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