"Measurement of Time of Travel in Streams by Dye Tracing" In Reply Refer To: August 22, 1989 WGS-Mail Stop 415 OFFICE OF SURFACE WATER TECHNICAL MEMORANDUM NO. 89.17 SUBJECT: PUBLICATIONS--"Measurement of Time of Travel in Streams by Dye Tracing" by F. A. Kilpatrick and J. F. Wilson, Jr. The purpose of this memorandum is to announce the availability of the subject report, Techniques of Water-Resources Investigations (TWRI), Book 3, Chapter A9, "Measurement of Time of Travel in Streams by Dye Tracing." (Copy attached.) This manual describes methods of measuring time of travel of water and waterborne solutes by dye tracing. The fluorescent dyes, mea- suring equipment used, and field and laboratory procedures also are described. Methods of analysis and presentation to illus- trate time of travel of streams are provided. The manual is a revision of "Measurement of Time of Travel and Dispersion in Streams by Dye Tracing," by E. F. Hubbard, F. A. Kilpatrick, L. A. Martens, and J. F. Wilson, Jr., Book 3, Chapter A9, published in 1982. Dispersion and the simulation of wastes by dye tracing will be covered in a forthcoming TWRI intended to com-plete the series on use of dyes. A limited number of these manuals are available for distribution from the Office of Surface Water (OSW). To receive additional copies, please contact the OSW by electronic mail or by telephone (FTS 959-5301 or 703/648-5301). Charles W. Boning Chief, Office of Surface Water Attachment WRD DISTRIBUTION: Selected list attached This memorandum does not supersede any previous OSW Memorandum Selected list: A Chief, Branch of Instrumentation Chief, Branch of Scientific Publications Chief, Office of Water Quality Chief, Office of Ground Water Chief, Office of Hydrologic Research FO (2 each) PO