QUESTION 7
Answer the following questions as they relate to storm water intakes and/or outfalls.
(a)  State the purpose of a wing wall for a storm water intake or outfall.
(2 marks)
(b)  Describe TWO different situations where wing walls may be installed.
 1
 2
(2 marks)
(c) State TWO purposes of the baffles on the outlet side of a wing wall.
 1
 2
(2 marks)
(d)  A grate is often installed to prevent large items entering into a wing wall.
 (i)  State where the grate should be installed.
 
(1 mark)
 (ii)  State the angle at which the grate should be installed.
(1 mark)
 (iii)  Explain the importance of the angle in (ii).
(1 mark)
Total 9 marks

Linkback: https://www.plumbers.nz/drainlaying-exam-june-2008/27/question-7/220/

Wing walls are specified by either engineers, councils or manufacturers. They are manufactured to NZS 3109:1997 and 3114:1987. For more info I would recommend getting a spec from your council. Will help with study! see attached file Good luck