This guide explains the landscaping coefficient method established by the University of California. http://wv.owue.vrater.ca.govidocstwucolsoo.pdf. Landscape Inigation: Design and Management, by Stephen W. Smith (John VViley &Sons, 1996). Ttuffrn.gation Manual, fifth edition, by Richard B. Choate (Telsco Industries, 1994). Water-Efficie