If four fires break out in a city of populationlakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is
Turbidity of raw water is a measure of
By boiling water, hardness can be removed if it is due to
The maximum permissible nitrites in public water supplies, is
Time of concentration
Pick up the correct statement from the following :
The fire demand of a city may be worked out by
A high velocity of wash water is required for
Pick up the incorrect statement from the following regarding fire hydrants
Aeration of water is done to remove
Water supply includes
For determining the velocity of flow of underground water, the most commonly used non-empirical formula is
In distribution pipes, drain valves are provided at
The specific retention is least in case of
The yield of a rapid gravity filter as compared to that of slow sand filter, is
Corrosion of well pipes may not be reduced by
Surge tanks are used
B.O.D. of treated water should be
As per IS : 1172-water required per head per day for average domestic purposes, is
In slow sland filters, the turbidity of raw water can be removed only up to
Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be
Acidity in water is caused due to
Gravity conduits
The most ideal disinfectant used for drinking water throughout the world, is
Carbonates in water produce
Before constructing a dam, the factor to be considered for controlling sedimentation, is
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