A military operation can be planned with the help of a contour map.Estimating the volume of reservoir storage water, the volume of earthwork in cutting and embankment can be done by using the contour map.It is possible to select the most suitable and economical sites for work such as the location of roads, railways, canals, pipelines, dams, reservoirs etc.flat, uniformly, sloping, undulating or hilly etc. Estimating the quantities of earthwork.Nature of ground surface may be determined.Alignment for roads, canals, transmission lines is done efficiently with the help of contour map.The suitable site can be selected for construction activities.The indirect method is cheaper, quicker and less tedious than the direct method. Determine the elevation of these points in the field.Establishing a definite pattern of ground points whose relative position are known.In this method levelling work is carried out in the field and location of contour points is done in the office. Plot the survey to a suitable scale on the paper.Carry out a survey to determine relative positions of these points of a contour line in the field. Repeat the procedure for other contours either with the same position or by shifting the instrument.Mark the points on the ground by pegs or coloured tags.Direct the staffman to move within the boundaries of the area so as to get the desired staff reading through the dumpy level.Calculate the staff reading required for a particular contour by the relation.ĭesired staff reading = HI – contour elevation. The fieldwork involved in this method is as follows. Now the contour can be plotted on the map. These points are thereafter surveyed and their positions in the horizontal plane are found out within given boundary. In this method, the contours are directly located on the ground and the points of given contour are marked on the ground. This method is tedious and time-consuming. There are two methods of locating contour
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