BEYOND THE GUIDEBOOK INITIATIVE IN BRITISH COLUMBIA: At 2007 Water Balance Model Partners Forum, Jim Dumont explained why and how the Runoff-Based Approach connects the dots between on-site rainwater capture and downstream stream health
“A basic tenet of hydrology is that rainfall and runoff have different return periods. Yet drainage practitioners persist in applying a rainfall-based approach that assumes rainfall will always result in the same magnitude of runoff,” stated Jim Dumont. “We are at a crossroad in the path defining the methodologies and applications used in rainwater management. In a nutshell, Beyond the Guidebook enables us to make a clear distinction between a rainfall-based approach and a runoff-based approach. The runoff-based approach is best suited to the analysis needed to assess effectiveness of mitigation techniques.”