The following page contains a graph of the profile survey T

) The following page contains a graph of the profile survey. The points are marked by a small circle which locates the distance (by the station) and elevation; why were these particular points chosen to be part of the profile observations?

805\' 800 795 790 ELEV (ft.) 785 780 775 22+00 27+00 28+00 2900 23+00 24+00 25+00 26+00 30+00 31+00 32+00 Stations

Solution

Higher the undulations of the ground, closer will be the spacing between the points chosen. The spacings are chosen closely in order to have more accurate profile of the ground. In the fig, it is clear that at each stations one point is taken. And in between some stations where there is more undulations in the ground, more no. of points are being taken for the reason mentioned above.