The document summarizes the water system designed and built by the Inca at the archaeological site of Machu Picchu in Peru. The Inca engineers located a natural spring and built a 749m long stone canal with a 3% slope to carry water from the spring to a series of 16 fountains within the city. The fountains were arranged hierarchically and integrated with sophisticated drainage and irrigation systems to supply the population with water and protect against erosion. The system is still functional today, demonstrating advanced hydrological engineering by the Inca civilization.