Environmental Engineering
The distribution mains are designed for

Average daily demand
Maximum hourly demand on maximum day
Maximum daily demand
Maximum hourly demand

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Environmental Engineering
The polluted water is one which

Is safe and suitable for drinking and domestic use
Consists of undesirable substances rendering it unfit for drinking and domestic use
Is contaminated
Contains pathogenic bacteria

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Environmental Engineering
Sludge volume index is defined as the ratio of

Percentage of sludge by volume to percentage of total solids by weight
Percentage of suspended solids by weight to percentage of sludge by volume
Percentage of sludge by volume to percentage of suspended solids by weight
Percentage of total solids by weight to percentage of sludge by volume

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