The liquid wastes originating from residential and industrial buildings, are collectively called:
The sum total of domestic and industrial sewage is termed as sanitary sewage or simply sewage.
A combined sewerage system, collectively carries
When the rain runoff drainage is carried along with sewage it is called a combined system. When the drainage and sewage are taken independently of each other through two different sets it is called a separate system.
An sewer pipe carrying sewage from a building to the point of its immediate disposal, is called.
The sewer pipes have to be designed and checked for
Minimum flows in sewers is needed to maintain minimum flow velocity or self cleansing velocity to avoid siItation problem.
The ratio of maximum daily sewage flow to the average daily sewage flow for sewer mains of 0.5 to 1 m diameter, is generally taken as
Maximum daily flow = 2 times the average daily flow
Maximum hourly flow =1.5 times the maximum daily flow
= 3 times the average daily flow
The ratio of minimum hourly flow to the average flow of sewage, is
Minimum daily flow = 2/3 x Average daily
Minimum hourly flow = 1/2 x Minimum daily flow
= 1/3 Average daily
The value of the coefficient of runoff for perfectly impervious areas, tend to:
Coefficient of runoff is a factor which tells the proportion of water flowing off and not going into the earth. Since, for perfectly impervious area all of the water will flow off and none will get into the ground, therefore, the coefficient of runoff will be equal to 1.
The drainage discharge of a town of 16 hectares area, consisting of 40% hard paved (k = 0.8), 30% unpaved (k = 0.20), and remaining as wooded (k =0.1), with a max. rain intensity of 5 cm/hr, would be computed by Rational formula, as equal to
Pick up the incorrect statement:
In a circular sewer of dia D, if the depth of flow is D/4, the wetted perimeter will be equal to