Impact Assessments present an overview of the current climate and hydrology in a basin, an analysis of observed trends in temperature and precipitation over the past decade, and a comparison of these trends against model projections. They also present hydrologic projections developed from global climate models, which have been used as input to a local operations model to evaluate the ways that the projected climatic and hydrologic changes would impact water availability and management. Specific risks to water supplies and demands posed by climate change, and evaluated in this study, include changes in snowpack, timing and quantity of runoff, groundwater recharge and discharge, as well as changes to evaporation, transpiration, and other water demands.