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

6 hours
4 hours
2 hours
8 hours

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Waste Water Engineering
In septic tanks,

The baffles or tees are extended up to top level of scum
The clear space between the baffle top and covering slab is about 7.5 cm
All listed here
Free board of 0.3 m may be provided

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