density of population is high and space available is less source of water is at low level fire accidents occur frequently power failures are more common

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pumping is for limited hours it is economical repairs can be carried out during non-supply hours supply is assured during a fire accident

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it is highly economical in the long run less quantity of water shall be sufficient hours can be standard for different zones of different elevations wastage is quite less

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bigger pipes and pumps required consumers should store water more number of valves required infiltration of impurities may occur through leaky joints

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elevated storage reservoirs required we may not get enough water to fight fire it needs pumping round the clock adequate pressure may not exist in pipes

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low morale of people poor quality of pipes and fittings dead end system of net work of pipes unauthorised connections

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is of great help in intermittent supply system boosts pressures in pipes increases storage capacity of water helps fire fighting

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lighter particles float due to the attachment of gas bubbles lighter particles are separated lighter particles are set to float unaided lighter particles settle

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any material capable of preventing light suspended solids and colloidal solids suspended solids intensity of colouration

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causes change of taste is unaesthetic give apparent colour prevents light penetration and hence photosynthesis

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