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Sprinkler irrigation involves distributing water in pipes under pressure and spraying it into the air so that it breaks up into small droplets and falls to the ground like natural rainfall. Sprinkler systems are generally more efficient and use less labour than surface irrigation and can be adapted more easily to sandy and erodible soils on undulating ground. There are many types of sprinkler system available, but the most common is a system using portable pipes (aluminium or plastic) supplying rotary impact sprinklers. An individual rotary impact sprinkler produces a circular wetting pattern with poor uniformity. To obtain good uniformity, several sprinklers are always operated close together so that the patterns overlap.