Paul R. Houser, Science Advisor Paul R. Houser, Science Advisor Western U.S. Observed Hydrology & Vegetation Changes Less Spring Snowpack Cayan et al., 2001 Earlier Greening Stewart et al., 2005 Earlier Snowmelt Runoff Less Snow, More Rain Increasing Temperature
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Western U.S. Observed Hydrology & Vegetation Changes
Western U.S. Observed Hydrology & Vegetation Changes. Earlier Greening. Less Snow, More Rain. Earlier Snowmelt Runoff. Stewart et al., 2005. Less Spring Snowpack. Increasing Temperature. Cayan et al., 2001. Key Challenges for Reclamation. - PowerPoint PPT Presentation
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Paul R. Houser, Science AdvisorPaul R. Houser, Science Advisor
Western U.S.Observed Hydrology & Vegetation Changes
Less Spring Snowpack
Cayan et al., 2001
Earlier Greening
Stewart et al., 2005
Earlier Snowmelt Runoff Less Snow, More Rain
Increasing Temperature
Paul R. Houser, Science Advisor
Key Challenges for Reclamation• Understand how climate variability and
change can affect Western water supply and demand, and Reclamation delivery of water given operational constraints (i.e. environmental constraints, flood constraints)
• Bring science and technology to bear on the needs of water resources managers
• Address goals of internal programs and authorizations where climate change is a factor
Paul R. Houser, Science Advisor
Reclamation Climate Studies
• Climate Change and Water Working Group (CCAWWG): NOAA, USGS, USACE, EPA, NASA, FEMA collaboration
• Climate change is occurring; effects differ regionally.• Water resources management could be affected; hydroclimate conditions becoming non-
stationary.• Climate change is one of many challenges facing water managers.
From USGS Circular 1331 (Brekke et al. 2009)
• Federal agencies that conduct water management have a responsibility to take a lead role in assessing risks to the water resources and to develop adaptation and mitigation strategies