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' Nelson Mining Resource <br /> Integrated Noxious Weed Management Plan <br /> ' August 2019 <br /> Page 16 <br /> 1. The distance of the outermost nozzles on the boom must not exceed 3/4 the length of the <br /> ' wingspan or rotor. <br /> 2. Nozzles must always point backwards parallel with the airstream and never be pointed <br /> downwards more than 45 degrees. <br /> AERIAL DRIFT REDUCTION INFORMATION <br /> ' INFORMATION ON DROPLET SIZE <br /> The most effective way to reduce drift potential is to apply large droplets. The best drift <br /> ' management strategy is to apply the largest droplets that provide sufficient coverage and control. <br /> Applying larger droplets reduces drift potential but will not prevent drift if applications are made <br /> improperly, or under unfavorable environmental conditions (see "Wind", "Temperature and <br /> ' Humidity", and "Temperature Inversions"). <br /> ' CONTROLLING DROPLET SIZE <br /> ■ Volume—Use high flow rate nozzles to apply the highest practical spray volume. <br /> Nozzles with higher rated flows produce larger droplets. <br /> ■ Pressure—Do not exceed the nozzle manufacturer's recommended pressures. For many <br /> nozzle types lower pressure produces larger droplets. When higher flow rates are needed, <br /> ' use higher flow rate nozzles instead of increasing pressure. <br /> ■ Number of Nozzles—Use the minimum number of nozzles that provide uniform <br /> ' coverage. <br /> ■ Nozzle Orientation—Orienting nozzles so that the spray is released parallel to the <br /> airstream produces larger droplets than other orientations and is the recommended <br /> ' practice. Significant deflection from horizontal will reduce droplet size and increase drift <br /> potential. <br /> ' ■ Nozzle Type—Use a nozzle type that is designed for the intended application. With most <br /> nozzle types, narrower spray angles produce larger droplets. Consider using low-drift <br /> nozzles. Solid stream nozzles oriented straight back produce the largest droplets and the <br /> ' lowest drift. <br /> ■ Boom Length—For some use patterns, reducing the effective boom length to less than <br /> ' 3/4 of the wingspan or rotor length may further reduce drift without reducing swath <br /> width. <br /> ' ■ Application Height—Applications should not be made at a height greater than 10 feet <br /> above the top of the largest plants unless a greater height is required for aircraft safety. <br /> Making applications at the lowest height that is safe reduces exposure of droplets to <br /> ' evaporation and wind. <br />