AN APPROACH TO THE RATIONALIZATION OF STREAMFLOW DATA-COLLECTION NETWORKS

A new procedure for rationalizing a streamflow data collection network is developed. The procedure is a two-phase approach in which the first phase, a hierarchical clustering technique is used to identify groups of similar gauging stations. In the second phase, a single station from each identified group of gauging stations is selected to be retained in the rationalized network. The station selection phase is an inherently heuristic process that incorporates information about the characteristics of the individual stations in the network. The methodology allows the direct inclusion of user judgment into the station selection process in that it is possible to select more than one station from a group, if conditions warrant. The technique is demonstrated using streamflow gauging stations in and near the Pembina River basin, southern Manitoba, Canada.