This comprehensive manual provides an overview for watershed planners and managers. It is equally intended to serve the needs of watershed engineers who are responsible for the collection of hydrological and related climatological data sets, and the installation and maintenance of local hydrological and related weather stations or networks of stations. Section titles include ...(1) Introduction ...(2) Rainfall (rain gages, data collection, and the analysis of data) ...(3) Interception and Deposition of Rainfall in a Forest Environment ...(4) Streamflow (measurement of streamflow discharge, data collection and processing, analysis, unit hydrograph and stormflow response) ...(5) Sediment (soil particle detachment and transport, classification of sediment, methods of measurement, laboratory analysis methods, data analysis) ...(6) Water Quality (water quality characteristics, measurements, monitoring, handling and treatment of samples, laboratory analysis techniques and data analysis) ...(7) Climate (site requirements for a weather station, air temperature, relative humidity, evaporation, wind, solar radiation, radiant energy and data analysis) ...(8) References.