"Evaluation of Selected Methods for Determining Streamflow During Periods of Ice Effect" In Reply Refer To: April 2, 1991 Mail Stop 415 OFFICE OF SURFACE WATER TECHNICAL MEMORANDUM NO. 91.06 Subject: PUBLICATIONS--"Evaluation of Selected Methods for Determining Streamflow During Periods of Ice Effect" by N. B. Melcher and J. F. Walker The purpose of this memorandum is to announce the availability of the subject Open-File Report 90-554, which will subsequently be published as a Water-Supply Paper. This publication describes the results of an evaluation of seventeen methods for estimating ice-affected streamflow. The methods were evaluated for potential use in computing streamflow records. The methods evaluated were selected by polling field offices and from a comprehensive litera-ture search. These methods and the techniques for applying them are described in the report. The methods are evaluated by comparing estimated results to data collected at three streamflow-gaging stations in Iowa during the winter of 1987-88. Discharge measurements were obtained at 1- to 5-day intervals during the ice-affected periods at the three stations to define an accurate baseline record. Discharge records were compiled for each method based on data available assuming a 6-week field schedule. A limited number of these reports are available for distribution from the Office of Surface Water (OSW). To receive copies, please contact C. R. Wagner (CRWAGNER) in the OSW by electronic mail (please furnish a full address). Charles W. Boning Chief, Office of Surface Water WRD DISTRIBUTION: A, B, S, FO, PO