1. Roman and New York Aqueducts
... walls was that they were inexpensive and easy to build. The problems with walls were that they became unstable when they were built very tall and walls did not allow water and people to move freely underneath them as arcades do. When a fairly deep and wide valley had to be crossed ... the cleanliness of the water was due to sediment tanks, in various parts of the aqueduct system, where the water slowed down and sediments and other contaminants could settle out. Another addition to the system was places where two aqueducts from separate sources could exchange water, balance ... of the cit...
- Word Count: 5087
- Approx Pages: 20
- Grade Level: High School