The starting point for an irrigation project is the floor plan given by the surveyor, or by the client if you are a professional.
It happens very often that it is a recovery from some old relief .. and maybe even an enlargement.
First of all, it must be clear to us that the real measurements in the plan must be fundamental to carry out our irrigation project and that we must also dedicate time to this to verify its veracity.
Write down changes (if any) of outdoor flooring including paths of driveways and the presence of flower beds or border hedges often unmarked. In this example in the curved side there are 2 recesses not present in the project that concern the position of the air conditioners one and a bin area in the other.
Their presence will force the use of multiple sprinklers to cover all the areas that have been created.
Not considering these variations, especially in the budget phase, can make the assessments wrong both for the type of sprinkler and for the subdivision of the sectors, completely out of phase the costs for the realization.
It happens as in this cover image, corrected by hand, that all the measurements were out of phase due to an enlargement made by a photocopier that varied the "official" room from 1:200 to an estimate of 1:142.
The problem with this estimate is that by enlarging or shrinking the sheet with the photocopier, the lens does not maintain its proportions creating errors, which if not verified on site, will create nasty surprises to already advanced work forcing you to have to revise everything.
Remember to devote energy to the checks that also include the presence or absence of passages under the sidewalks and the real position of the connection point for the departure of our irrigation plant.