concluded in the October 2015 ,
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Antiquity.
Rulers in each region directed the construction of reservoirs and canals that allowed spread-out cities to flourish. Effective water management cemented the power of kings by enabling masses of farmers to make a steady living.
Severe periods of drought,
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, indicated by analyses of tree rings and lake sediments,
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, strained water supplies in each tropical setting, Fletcher says. Periodic monsoon rains in Southeast Asia and Sri Lanka added insult to injury, overwhelming reservoirs and damaging canals.
Unable to supply enough water,
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, political systems at Greater Angkor and other tropical cities crumbled,
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, Fletcher argues. But societies didn’t vanish. Farmers reorganized into smaller communities based near coasts and along major rivers. Cultivation continued in fields that had once been part of massive cities.
Laser quest
Fletcher’s rise-and-disperse scenario for ancient tropical cities is being put to a broader test. From March to May 2015, a second set of lidar flights expanded laser mapping of northern Cambodia to a total area of 2,000 square kilometers. Researchers want to see if,
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, like Angkor Wat,
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, other ancient temples in the region sat in the center of dispersed settlements tied together by reservoirs,
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, canals and ponds. Archaeological investigations based on the new lidar data are under way. Evans plans to announce initial findings in June.
Over the next 10 to 15 years, lidar technology will become smaller and cheaper, Evans predicts. Laser-wielding drones will replace

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