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What is the major function of a water distribution system?
To carry water from individual homes to the treatment plant
To carry water from the source to the filtration unit
To carry water from the treatment plant to individual homes
To carry water from the source to the pump house
To carry water from the treatment plant to individual homes
A water distribution system serves as the final delivery network that conveys potable water from a treatment plant to the individual service connections of consumers. Its primary goal is to maintain required pressure and ensure water quality remains intact during transit.
CPHEEO Manual on Water Supply and Treatment
A water distribution system serves as the final delivery network that conveys potable water from a treatment plant to the individual service connections of consumers. Its primary goal is to maintain required pressure and ensure water quality remains intact during transit.
Q=A├ЧV тАФ where Q is discharge, A is cross-sectional area, and V is velocity of flow
hfтАЛ=2gDfLV2тАЛ тАФ Darcy-Weisbach equation for head loss in pipes
The system operates under either gravity, pumping, or a combined gravity-pump scheme. Water travels from the storage reservoirs to the distribution mains, sub-mains, and branch pipes until it reaches the consumer tap, ensuring that residuals like chlorine are maintained to prevent bacterial regrowth.
Distribution systems must maintain a minimum residual pressure of 7 to 12 meters at the ferrule point.
Water quality must be preserved by preventing cross-contamination from sewage pipelines.
Adequate pressure is essential to prevent the entry of external contaminants during pipe leakages.
Continuous supply is preferred over intermittent supply to prevent biofilm formation and pipe corrosion.
Ensures consistent water quality for domestic and industrial use
Maintains hygienic standards by preventing backflow contamination
High initial capital investment for pipeline networks
Susceptibility to water losses due to leakages and illegal connections
Municipal water supply schemes
Industrial process water distribution
Firefighting water networks
Option A and B describe water transmission or collection systems, not distribution.
Option D describes the raw water conveyance from the source to the treatment facility (intake works).
C is correct тАФ The water distribution system is specifically designed to transport treated, potable water from the treatment plant storage tanks to the end-users at appropriate pressure levels.
In competitive exams, remember that 'Transmission' relates to source-to-plant transport, while 'Distribution' always relates to plant-to-consumer delivery.
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