QUESTION 1 (Answer all parts) (10 marks) A new sewer is to be laid to drain a housing development to a manhole on an exi

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Question 1 Answer All Parts 10 Marks A New Sewer Is To Be Laid To Drain A Housing Development To A Manhole On An Exi 1 (39.26 KiB) Viewed 23 times

QUESTION 1 (Answer all parts) (10 marks) A new sewer is to be laid to drain a housing development to a manhole on an existing sewer. The centres of three proposed manholes A, B and C on the new sewer have been pegged out on site and the levels of the tops of the pegs were measured as follows: A = 98.13 m B = 98.23 m C = 98.68 m The new sewer is to be constructed to fall into the manhole on the existing sewer at a gradient of 1 in 200. The horizontal distance between the manhole on the existing sewer and the proposed manhole A is 80.00 m, with successive horizontal distance intervals between AB and BC being 66.00 m and 52.00 m respectively The cover level of the manhole on the existing sewer is 97.53 m and the formation level at the bottom of this manhole is 1.87 m below its cover level. If a 3.00 m traveller is to be used during the construction of the trench for the new sewer, calculate the height of the sight rail required above the cover of the existing manhole ii. the height of the sight rail required above the top of the peg defining the proposed manhole A the height of the sight rail required above the top of the peg defining the proposed manhole B iv. the height of the sight rail required above the top of the peg defining the proposed manhole C i.