This layer shows the historical and projected total winter (December- February) runoff. This includes any overland water flows in addition to subsurface runoff in shallow groundwater. The figure compares historical conditions (1970-1999, in inches) with the projected change (in percent) for ten global models, based on a 0.0625 degree (about 3 by 4.5 miles) resolution set of gridded projections. Two time periods are considered: the 2040s (2030 2059) and the 2080s (2070 2099), based on a moderate greenhouse gas scenario (A1B). Dark green shading on the historical map indicates areas that have received highest levels of total winter precipitation in Puget Sound. Projected changes are depicted by the light to dark green shading. Figure created by Jonathan Picchi-Wilson, Western Washington University, based on the CMIP3 projections used in the IPCC 2007 report. Data source: Hamlet et al. 2013.