渠网文明 · CANAL CIVILIZATION
The River That Needed Engineers — Pakistan · Indus Basin
印度河流域把古代城市走廊与现代巨型灌溉连在一起。摩亨佐-达罗兴盛于公元前三千纪；今天，流域依靠世界最大级别的连续灌溉系统。
河水从高山落入干旱平原，再靠渠网把价值铺开。曾经适合砖城的地形，今天仍要求农人同时处理洪水、泥沙、地下水与高温。
The Indus basin joins an ancient urban corridor to a modern irrigation giant. Mohenjo-daro flourished in the 3rd millennium BCE; today the basin is served by one of the world’s largest contiguous irrigation systems.
The river drops out of high mountains into a dry plain, then spreads its value through canals. The same geography that favored brick cities also asks modern farmers to balance floods, silt, groundwater and heat.