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Quantity-of-Waste-Water

Assuming surface on which rain falls in a thickly build up residential district as follows :
`40 %` area consists of roofs and pavements (`C_1 = 0.80`)
`60 %` of area consists of lawns and gardens (`C_2 = 0.2`)
Calculate coefficient of runoff. If area of district is 2 hectares and maximum intensity of rainfall is taken as 50 mm/hr, what is runoff of district? (Ans: `0.44, 0.122` `m^3`/sec)

Solution:Average runoff coefficient is,

`C=(C_1A_1+C_2A_2)/(A_1+A_2)`

`=(0.4**0.8+0.2**0.6)/1`

`=0.44`

Again,

Runoff is given by,

`Q_(WWF)=(CiA)/360`

`=(0.44**50**2)/360`

`=0.122\ m^3/s`

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A certain district of a city has a projected population of 50,000 residing over an area of 40 hectares. Find the design discharge for the sewer line, for the following data :
Rate of water supply = 200 lpcd
Average impermeability coefficient for the entire area =0.3
Time of concentration = 50 minutes
The sewer line is to be designed for a flow equivalent to the wet weather flow (WWF) plus twice the dry weather flow (DWF).Use British ministry of health formula. Assume that `70%` of water supply reaches in the sewer as wastewater.(Ans: `0.648 m^3/s`)

Assuming surface on which rain falls in a thickly build up residential district as follows :
`40 %` area consists of roofs and pavements (`C_1 = 0.80`)
`60 %` of area consists of lawns and gardens (`C_2 = 0.2`)
Calculate coefficient of runoff. If area of district is 2 hectares and maximum intensity of rainfall is taken as 50 mm/hr, what is runoff of district? (Ans: `0.44, 0.122` `m^3`/sec)

The surface of the town on which the rainfalls is classified as follows :
Types of surface % area Runoff coefficient
Roof 25 0.8
Pavements and yards 25 0.85
Macadamized roads 15 0.32
Gravel roads 10 0.2
Unpaved streets 20 0.15
Lawns and gardens 5 0.2
What is the runoff of the catchment if,
Total area of catchment is 12 hectares
Time of concentration for the area is 15 minutes.

Assuming the surface on which rain falls in a thickly build up residential district as follows : `40 %` area consists of roofs and pavements (`C_1 = 0.80`) `60 %` of area consists of lawns and gardens (`C_2 = 0.2`) Calculate the coefficient of runoff. If the area of the district is 2 hectares and the maximum intensity of rainfall is taken as 50 mm/hr

what is the runoff of the district? (Ans: `0.44

0.122` `m^3`/sec)

Quantity of Waste Water

Sanitary-Engineering