The watershed assessment procedure (WAP) is a tool to help forest managers understand the type and extent of current water-related problems that exist in a watershed and to recognize the possible hydrologic implications of proposed forestry-related development in that watershed. This guidebook explains how to complete a reconnaissance-level WAP analysis for coastal areas in British Columbia according to the provincial Forest Practices Code. The procedure includes compilation on a topographic base map of data relating to peak flow, surface erosion, riparian buffers, landslides, headwaters, and watershed characteristics, then converting the raw data into indicator scores and compiling the scores onto a watershed report card. The guide includes sample worksheet forms and instructions on how to summarize the results in five impact categories and how to produce a hazard index for each category. The appendices include definitions of erosion-prone areas and descriptions of forestry impacts on surface hydrology and erosion.