The Sprinkler Irrigation Association, being sensitive to the dynamic
nature of the irrigation industry, readily responds to new concepts and
new methods that allow for better conservation of our natural resources.
Such changes have brought about preparation of this, the Fourth Edition
of Sprinkler Irrigation. Each chapter of the Third Edition, published
in 1969, has been totally revised and updated and the material
published in the 1973 Supplement to that edition has been incorporated
as well. In addition, new chapters have been prepared on drip irrigation
and conversion to the metric system, making this, we believe, the most
complete text ever published on the subject of sprinkler irrigation.