Spray Head Sprinkler Nozzles
Spray head sprinklers are designed for watering small lawns,
shrubs and irregularly shaped landscapes. Improved sprinkler nozzles can
be easily retrofitted into existing sprinklers and are designed to apply water more
uniformly and precisely than older models.
Nozzles used in spray head sprinklers can be used
individually or in a group to apply a continuous spray or moving stream of
water. Water may be applied in a fixed pattern or the nozzle may be
adjusted to cover a wide range of arcs.
Historically, sprinkler performance has been graded based on
distribution uniformity, or how evenly the nozzles apply water. However, as
irrigation equipment manufacturers have introduced increasingly sophisticated
nozzles, DU alone may no longer be enough to measure water-use efficiency. The SWAT testing protocol for spray head nozzles also evaluates gross precipitation
rate, net precipitation rate, and losses due to overspray and overwatering.
SWAT Testing Protocol
Version 3.2 was released April 28, 2015, and is the current testing protocol being used for spray head sprinkler nozzles.
Version 3: Test Protocol
Spray Head Sprinkler Nozzles Performance Characteristics, Version 3.1 (PDF) Posted Oct. 29, 2014; no public comments received
Spray Head Sprinkler Nozzles Performance Characteristics, Version 3.0 (PDF) Posted Dec. 18, 2013
Public comments and responses, Version 3.0 (PDF) Posted April 29, 2015
Version 2: Test Protocol
High Uniformity Sprinkler Nozzles Version 2.0 (PDF) Posted June 25, 2013
Public comments and responses, Version 2.0 (PDF) Posted Dec. 18, 2013
Version 1: Test Protocol
High Uniformity Sprinkler Nozzles Version 1.0 (PDF) Last updated July 31, 2012
High Uniformity Sprinkler Nozzles Version 1.0 Public Comments (PDF) Posted Jan. 8, 2013
Responses to comments, Version 1.0 (PDF) Posted June 24, 2013