Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Chan Chan Archaeological Zone' has mentioned 'Irrigation' in the following places:
Occurrence Sentence Text Source
[4] This runoff allows for control of land and water through irrigation systems.
Contents 1 Etymology 2 Brief history 2.1 Conservation plan 2.1.1 UNESCO World Heritage Site 3 Archeological site 3.1 Walled compound Nik An (Ex Tschudi) 4 Architecture 4.1 Irrigation 4.2 Threats 5 See also 6 In-Text Citations 7 References 8 External links
Irrigation[edit]
Extensive agricultural areas and a remnant irrigation system have been found further to the north, east and west of the city.
The Moche and Chicama rivers once supplied an intricate irrigation system via an approximately 80 kilometre long canal, sustaining the region around Chan Chan during the height of the Chimu civilisation.