Waste Water Engineering
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

8 hours
2 hours
4 hours
6 hours

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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 minimum width of septic level is 90 cm
The outlet invert level is kept 5 to 7.5 cm below the inlet invert level
The depth of tank is kept equal to its width

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