Small spray droplets have low inertial energy, making them highly susceptible to drift. In addition, wind velocity is usually greater as height above the ground increases. Therefore, the closer the nozzle tips are to the ground, the smaller the likelihood of spray pesticide drift. However, lowering the spray boom without making adjustments in nozzle spacing may result in improper spray overlap, which will cause streaks of untreated areas, especially with flat-fan nozzles. This problem can be eliminated by using nozzles with a wider fan angle. However, nozzles with wider fan angles produce smaller drops than nozzles with narrow fan angles when operated at the same pressure and flow rate.