Waste Water Engineering
Hydraulic mean radius is

Difference in heads between two points in circular pipes
Mean radius of sewer
Cross-sectional area/wetted perimeter
Mean of radii in a pipe line of varying cross -sections

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Waste Water Engineering
Which one of the following statements regarding septic tanks is wrong?

A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
The depth of tank is kept equal to its width
The minimum width of septic level is 90 cm
The outlet invert level is kept 5 to 7.5 cm below the inlet invert level

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