The water may be supplied to the consumers either- (1) by continuous system or (ii) intermittent system. In the continuous system, water is available to the consumers for all 24 hours a day. Whereas, the intermittent system supplies water only during the peak hours of water demand, which is fixed hours in the morning and evening period of the day.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/design-operational-zones-distribution-system-24x7-continuous-water-supply-systems
[2] http://admin.indiaenvironmentportal.org.in/category/author/sanjay-dahasahasra
[3] http://admin.indiaenvironmentportal.org.in/category/author/kalpana-bhole
[4] http://admin.indiaenvironmentportal.org.in/category/author/r-tembhurkar
[5] http://admin.indiaenvironmentportal.org.in/category/journal/journal-indian-water-works-association
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/urban-water-supply
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/patna-t
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nanded-t
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bihar