Distribution of Water-Resources Investigations Report 96-4013, "Prediction of traveltime and longitudinal dispersion in rivers and streams," by Harvey E. Jobson In Reply Refer To: April 25, 1996 Mail Stop 415 OFFICE OF SURFACE WATER TECHNICAL MEMORANDUM NO. 96.06 Subject: Distribution of Water-Resources Investigations Report 96-4013, "Prediction of traveltime and longitudinal dispersion in rivers and streams," by Harvey E. Jobson The possibility of a contaminant being accidentally or intentionally spilled upstream from a water supply is a constant concern to municipal and industrial water supplies and users. The Water Resources Division has addressed these concerns by conducting tracer studies to quantify traveltime and longitudinal dispersion in many streams and rivers. The purpose of this memorandum is to announce and distribute a number of copies of the subject report which provides methods to estimate (1) the rate of movement of a contaminant through a river reach, 2) the rate of attenuation of the peak concentration of a conservative contaminant with time, and (3) the length of time required for the contaminant plume to pass a point in the river. The report compiles the results of many of the U.S. Geological Survey tracer studies and applies the concepts presented by Kilpatrick (Techniques of Water Resources Investigations Book 3, Chapter A-20) to provide a method of making reasonable predictions quickly at locations where little data are available. Although the accuracy of the predictions can be greatly increased by performing time-of-travel studies on the river reach in question, the emphasis of this report is on providing methods for making estimates where few data are available. Thomas H. Yorke Chief, Office of Surface Water Attachment WRD Distribution: A, B, AH, PO NOTE: THIS MEMORANDUM IS BEING REISSUED AS OSW TECHNICAL MEMORANDUM NO. 96.06 AND SHOULD REPLACE THE ORIGINAL 96.05 WITH LIKE SUBJECT. IF YOU HAVE QUESTIONS PLEASE CALL THE OFFICE OF SURFACE WATER AT 703/ 648-5301.