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Hydrologic Vulnerabilities and Risk in the San Jose Watershed
R.D. (Dan) Moore PhD PGeo1
Georg Jost PhD1
Russell Smith PhD2
1 Departments of Geography and Forest Resources Management
The University of British Columbia2 WaterSmith Consulting
Vulnerabilities (1)
• complex hydrology– wetlands– evaporation is a significant fraction of
precipitation
05
1015
Mean daily flow SAN JOSE RIVER ABOVE BORLAND CREEK
Date
Dis
char
ge [
m3 s1
]
1985 1990 1995 2000
A (partial day)B (ice affected)E (estimated)
Vulnerabilities (2)
• data limitations– limited number of climate stations, snow data– water licenses: measured streamflow less than
actual streamflow by an unknown amount
Risks Associated With Climate Change
• likely decrease in annual flow (but not full consensus among models)
• changes to timing of runoff– higher flows in winter and early spring– earlier peaks in spring– lower flows through summer/autumn
Take-home messages
• current water availability not well known• water availability in growing season will
decrease due to– increased evapotranspiration– earlier snowmelt