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QUESTION 8
(a) In relation to drainlaying define the following terms.
(i) Main drain
(2 marks)
(ii) Sullage
(1 mark)
(iii) Infiltration
(1 mark)
(iv) Outfall
(1 mark)
(v) Surcharge (sanitary)
(1 mark)
(vi) Access chamber
(1 mark)
(b) State TWO purposes of a sewer gas interceptor trap.
1
2
(2 marks)
(c) State where measurements are taken to find the developed length of a drainage system,
and what these measurements include.
(1 mark)
Total 10 marks
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Question 8
a) The principal drain into which individual drains discharge.
b)
c)
d) That part of the disposal system receiving surface water or foul water from the drainage system. For foul water, the outfall may include a sewer or a septic tank. For surface water, the outfall may include a natural water course or soakage system.
e) To overload a sewer or drain, usually by stormwater or tidal water.
f) A chamber over 1m deep and wide enough for a person to enter, with working space at drain level through which the drain passes either as an open channel, or as a pipe incorporating an inspection point.
g)