<p>This architectural drawing is longitudinal section of main canal. Longitudinal section of a canal, The points which should be consider in fixing alignment of the canal. Actually, the whole of the area where irrigation is propose, is surveyed, and contour plans prepared. The other features of the area are also marked over the plans. A section taken through the lengthwise dimension of a structure. It can also be termed as the Side Elevation of a structure. Longitudinal sections of Roads, Canals, Bridges, etc are very useful in determining the theoretical gradient of the proposed structure based on the existing surface conditions. For more details and information download the drawing file.</p>