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Quantity-of-Waste-Water

Assuming surface on which rainfalls is thickly built residential district as follows :
% of total surface
Types of surface Impermeability
48 Roofs and pavements 0.85
22 Lawns and gardens 0.2
30 Ground surface 0.1
Calculate average impermeability factor. If total area draining to sewer is `6` hectares and maximum intensity of rainfall is `55` mm/hr. Estimate runoff from area.[TU 2006]

Solution:

Average Impermeability factor is,

`C=(0.85**0.48+0.2**0.22+0.1**0.3)`

`=0.482`

Now, the runoff from the area is,

`Q=(CiA)/360`

`=(0.482**55**6)/360`

`=0.442 \ m^3/s`

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This Chapter Quantity-of-Waste-Water consists of the following topics

Assuming the surface on which rainfalls in thickly built residential district as follows: `40 %` area consist of roofs and pavements having impermeability factor `C` as `0.85`, `40 %` of area consists of lawns and gardens having `C` as `0.20` and remaining area consists of ground surface having `C` as `0.1` .If the total area draining to the sewer is `5` hectares and maximum intensity of rainfall is `50` mm/hr, estimate the probable runoff from the area.

Assuming surface on which rainfalls is thickly built residential district as follows :
% of total surface
Types of surface Impermeability
48 Roofs and pavements 0.85
22 Lawns and gardens 0.2
30 Ground surface 0.1
Calculate average impermeability factor. If total area draining to sewer is `6` hectares and maximum intensity of rainfall is `55` mm/hr. Estimate runoff from area.[TU 2006]

A population 50,000 resides in a town covering an area of 75 hectares. Calculate the design discharge for the combined system of sewers. Given,
Coefficient of runoff =0.7
Time of entry = 5 minutes
Time of flow = 20 minutes
Water supply rate = 120 lpcd. [PU-2008]

Assuming the surface on which rainfalls is thickly built residential district as follows : % of total surfaceTypes of surfaceImpermeability48Roofs and pavements0.8522Lawns and gardens0.230Ground surface0.1Calculate the average impermeability factor. If the total area draining to the sewer is `6` hectares and maximum intensity of rainfall is `55` mm/hr. Estimate the runoff from the area.[TU 2006]

Quantity of Waste Water

Sanitary-Engineering