Field surveys: Measurement of distances, reliefs, altimetry, and natural or artificial elements (walls, trees, networks). Drawing of plans: Use of DAO (Computer Aided Drawing) and GIS (Geographic Information System) software to model the terrain. Implementation: Postponement of plans on the field to define the precise location of works before construction. Site control: Verification of the conformity of the work and completion of the collection plan at the end of the construction site.