COMPUTATION--Accuracy of winter streamflow records



In Reply Refer To:                                        September 7, 1983
EGS-Mail Stop 415




SURFACE WATER BRANCH TECHNICAL MEMORANDUM NO. 83.06

Subject:  COMPUTATION--Accuracy of winter streamflow records

The purpose of this memorandum is to transmit a report prepared by Environment
Canada on the subject of the accuracy of winter streamflow records.  This
report should be of interest to all who are involved in some way with the
computation and analysis of winter streamflow records.

The report discusses three methods of computing winter records: (1) backwater
method; (2) interpolated-discharge method; and (3) adjusted-discharge
method.  This study indicates that the backwater method generally gives the
poorest results.  The interpolated-discharge method is probably the most
commonly used in the U.S. Geological Survey and generally gives good results.
The interpolated-discharge method, however, should be considered for certain
conditions as explained in the report.




                                           Marshall E. Moss
                                           Chief, Surface Water Branch

Attachment

Distribution: FO, SL