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William Battaglin, Lauren Hay, and Markstrom Steve

more urbanized areas in Colorado and other states. Recent studies, however, suggest that tourism and skiing in particular are at risk from climate change ( Aspen Global Change Institute 2006 ; Williamson et al. 2008 ). Projections of future climatic conditions are needed to determine the potential effects of climate change on Colorado’s water resources. General circulation model (GCM) simulations of future climate through 2099 project a wide range of possible scenarios ( Alley et al. 2007 ). Local

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Lauren E. Hay, Steven L. Markstrom, and Christian Ward-Garrison

modeling. Statistical downscaling ( Wilks 1995 ; Wilby et al. 1999 ; Antolik 2000 ; McCarthy et al. 2001 ; Alley et al. 2007 ) uses empirical relations between features reliably simulated by a GCM at grid scales and surface predictands at subgrid scales. Dynamical downscaling uses regional climate model simulations with initial and lateral boundary conditions from GCM output for much more spatially detailed climate simulations over a region of interest ( Hay and Clark 2003 ; Leung et al. 2003

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David M. Bjerklie, Thomas J. Trombley, and Roland J. Viger

not require HRUs to be delineated on watershed boundaries, this model uses the 12-digit HUCs as HRUs to ensure that each HRU has a single outlet through which all streamflow passes. GIS characteristics of each HRU, including the coordinates of the HRU centroid, topography [slope, aspect, and elevation; ( http://ned.usgs.gov/ ); accessed October 2008], soils [( http://soils.usda.gov/survey/geography/ssurgo/ ); accessed October, 2008], land cover ( Vogelmann et al. 2001 ) [( http

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