Correct Answer - Option 4 : Maximum hourly demand on maximum day
Explanation:
(i) The sources of supply (such as wells) may be designed for maximum daily consumption or some times for average daily consumption.
(ii) The pipe mains (to take water from source to service reservoir) and filter and other treatment units are designed for the maximum daily draft.
(iii) Pumps may be designed for maximum daily draft plus some additional reserve for break down and repair.
(iv) The distribution system (to carry water from service reservoir to water taps) should be designed for the maximum hourly draft of maximum day or coincident draft with fire, whichever is more.
(v) The service reservoir is designed to take care of hourly fluctuations, fire demands and emergency reserves.
