For a rectangular pool is necessary to measure internal length and width. These dimensions must be measured from the rim of the pool, so that the company may calculate the extra length required for the corners. So, for a rectangular pool a drawing is not necessary, but, only a reference i.e. 8x4mtrs or 10x5mtrs. For every pool of a different shape a scale plan is needed to be sent by Fax, PDF or DWG file. An AutoCAD in DWG file is a far better solution. For pools designed with straight segments and circular arcs, drawings of simpler PDF forms or even printed in paper are sufficient.