We would like to thank the staffs and employees of water-service organizations who shared hydrologic and chemical data. Data were obtained from Salt River Project; the Cities of Phoenix, Glendale, and Sun City; the Roosevelt Irrigation District, Buckeye Irrigation Company, Metropolitan Water District, Sunnyboy Water company, and other smaller companies.
Cokriging has been (and is being) developed in part by Dr. Donald E. Myers of the Department of Mathematics, University of Arizona. He has been a great help throughout the project, and we wish to thank him for his time, patience, assistance, and interest. We also thank the Department of Mathematics and, in particular its wonderful computer system administrator, Mr. Bob Condon, for its role in helping to prepare this presentation.