Angkor Holds rrigation and drainage facilities such as reservoirs and canals to prevent floods and store irrigation water
Anuradhapura Has large "tanks" and associated irrigation canals etc. These were built to enable the city to run and feed itself as it lies within Sri Lanka's "dry zone"
El Fuerte de Samaipata ICOMOS: "There is an impressive series of at least nine cultivation terraces on the east and south of the rock. They are interconnected by means of stone steps and have a
sophisticated system for drainage."
Fortifications of Vauban Longwy: 5 wells for drinking water to see the inhabitants through a siege
Petra "The area is visited by flash floods and archaeological evidence demonstrates the Nabataeans controlled these floods by the use of dams, cisterns and water conduits. These innovations stored water for prolonged periods of drought, and enabled the city to prosper from its sale" (Wiki)
Polonnaruva Has large "tanks" and associated irrigation canals etc. These were built to enable the city to run and feed itself as it lies within Sri Lanka's "dry zone" ; link