The growth and purposes of the Water Survey of Canada's British Columbia network are described from a practical point of view, tracing the progress toward a rational data gathering system. The network consists of several subnetworks of which three, the regional, the major stream and the national inventory, are described in detail. As the major stream and national networks are reasonably simple in purpose and operation, the major part of the discussion is concerned with the regional network whose main purpose is the transfer of information. To meet this purpose and to analyze the performance of the network, certain procedures for the organization of data have been employed. These procedures included data banks for both hydrologic quantities and grid square extracted physiographic characteristics and regression analysis for relating the quantities in these data banks. The discussion outlines the British Columbia experience of sampling and transferring data in a diverse and primarily mountainous terrain.