(Solved): A pipe is to be installed between points A to D. The ground level has been recorded and therequired ...

A pipe is to be installed between points A to D. The ground level has been recorded and the required level for the underside of the pipe at point A has been calculated. The pipe must fall at a stated gradient (the ratio of change in vertical height with horizontal distance, V:H is given in the table below), with the pipe reducing in level from A to D. A traveller (height provided in the table) is to be used in conjunction with sight rails to ensure the excavation reaches the correct depth and the pipe is installed at the correct fall. The sight rails must be more than 500 mm above the ground but less than 1.7 m above the ground surface. Point Chainage (m) A B C D 1000 1050 1100 1150 Ground level (m AOD) 99.672 99.172 98.675 98.172 Level for the underside of the pipe (m AOD) 98.550 to be determined to be determined to be determined Height of Traveller (m) 2.000 Required fall of the pipe (V:H) 1:80 What is the required height of the sight rail above the ground at point C, and has the condition for the level of sight rails at points A-D been achieved (greater than 500mm but less than 1.7 m above the ground surface? O a) yes, the criteria for the sight rails have not been met. The height of the sight rail at C is 0.503 m above the ground surface Ob) Yes, the criteria for the sight rails have been met. The height of the sight rail at C is 0.625 m above the ground surface O c) yes, the criteria for the sight rails have not been met. The height of the sight rail at C is 1.003 m above the ground surface O d) Yes, the criteria for the sight rails have been met. The height of the sight rail at C is 0.875 m above the ground surface e) none of the above