This report quantifies the annual runoff from major basins in British Columbia for the period 1961-1993, establishing a normal period of 1961-1990 for comparative analysis. The study, conducted by BC Environment's Integrated Management Branch, divides the province into 19 distinct basins to determine yearly runoff. It details the methodologies employed, including estimations for missing data through graphical correlation and comparisons with similar gauged watersheds, and adjustments for external factors like storage, diversions, and inflow from outside the province. The findings are presented in tables detailing estimated annual runoff in cubic meters per second for each basin, alongside total runoff figures for all basins.

This technical report provides a comprehensive dataset and methodology for understanding water runoff patterns in British Columbia. The detailed approach to data estimation and correction suggests a rigorous scientific standard, making it a valuable resource for environmental scientists, hydrologists, and policymakers. The establishment of a standard normal period allows for consistent future comparisons of hydrological data. The report's focus on specific estimation procedures and tabulated results indicates its utility as a reference document for regional water resource management.