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Evapotranspiration
Review Of Current Chapter
25” of PET annually (approx. 83% of annual ppt)
35” of Evaporation annually (UM value)
Growing Season: Operating deficit of 8.9” (2.7” PET + 6.2” EC)
TREND ANALYSIS
EVAPOTRANSPIRATION
Excess has decreased over the past decade
Thornthwaite
y = -0.5259x + 9.0047
-2
0
2
4
6
8
10
12
14
16
18
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
Year
Exc
ess
Pre
cip
(in
)
Yearly Thornthwaite Excess Period of Record AvgLinear (Yearly Thornthwaite Excess)
TREND ANALYSIS
EVAPORATION
Evaporation excess has decreased over the past decade
Evaporation Coefficient
y = -0.5259x - 1.2353
-12
-10
-8
-6
-4
-2
0
2
4
6
8
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
Year
Exc
ess
Pre
cip
(in
)
Yearly Excess Period of Record Avg Linear (Yearly Excess)
Implications
Coefficients for the District are “published” values but should be monitored
Excess precipitation is dependent on volume of precipitation received
Expectations
Less Excess Precipitation = Less Natural Recharge
Less Excess Precipitation= Losing Lakes and Wetlands
Questions?
Thank You
Coon Creek Watershed District