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Waste Water Engineering

Waste Water Engineering
The ratio of minimum hourly flow to the average flow of sewage is

43894
43834
43832
43833

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Waste Water Engineering
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is

0.12 cumec
0.10 cumec
0.15 cumec
0.20 cumec

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Waste Water Engineering
Hume steel pipes are

Steel shell coated from outside with cement mortar
Steel pipes
Both B and C
Steel shell coated from inside with cement mortar

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Waste Water Engineering
You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at

Half full
Two third full
Three fourth full
Full depth

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Waste Water Engineering
For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by

Lloyd Davis
Kinchling
Frubling
All listed here

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Waste Water Engineering
Dry weather flow is:

Average daily rate of flow
Average monthly rate of flow
Water supply allowance per capita
Average annual rate of flow

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