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

0.10 cumec
0.20 cumec
0.12 cumec
0.15 cumec

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Waste Water Engineering
The pressure exerted by

All listed here
The internal pressure if any, causes tensile stress in the pipe material
The sewage when running full from inside, is called internal pressure
Pressure sewers are designed to be safe in tension

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