Waste Water Engineering
In case of sewer lines

All listed here
Obstruction test is carried out with the help of smooth ball of diameter 13 mm
Water test is carried out to check water tightness of the joints
Test for straightness is carried out with the help of a lamp and mirror

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Waste Water Engineering
In septic tanks,

All listed here
Free board of 0.3 m may be provided
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

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