If you have just collected villa keys, you have inherited a system you did not design, running on settings you did not choose. Do the audit in week one, before anything dies quietly. Find the irrigation controller (usually in the garage, a side passage or a valve box near the boundary wall), photograph its current programme, and run each zone manually for two minutes while you walk the garden watching where water actually emerges. Dry corners, geysering broken heads and drippers crusted shut with limescale all show themselves in ten minutes.
New arrivals from temperate countries should also recalibrate the calendar. The UAE planting year is inverted: October to March is the growing season when you plant, seed and renovate; June to September is survival mode when the only jobs are watering, light pruning and pest checks. Arriving in July and immediately planting a bed of nursery flowers is the most common, and most expensive, newcomer mistake.