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This report documents the results of rating analyses based on linear multiple regression for ice-covered periods of flow at 33 stations on selected rivers in Maine. The report also presents functions relating uncertainties in records to the number of discharge measurements made at 54 stations. The application is unusual in that it includes analysis of the uncertainty of discharge affected by backwater from ice. Total uncertainty consists of errors incurred during both streamflow measurement and data processing. An average of 46.8 percent of the total variance for the 21 stations not affected by backwater was due to measurement variance and 53.2 percent was due to process variance. Data from the remaining 33 stations were classified as either summer period or winter period. Among the summer-period stations, an average of 49.3 percent of the total variance was due to measurement variance and 50.7 percent was due to process variance. Among the winter-period stations, an average of 25.2 percent of the total variance was due to measurement variance and 74.8 percent was due to process variance. Results of the seasonal division of average variance suggest that the process and measurement variances are essentially equal during open-water periods and that process variance is considerably greater than the measurement variance during backwater periods. The errors in winter discharge records significantly increased average uncertainty in the records of annual mean

Uncertainties in records of annual mean discharge in Maine