#4- Comp Plan - Evaporation & Evapotranspiration

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  • 1. Evapotranspiration
  • 2. 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)
  • 3. TREND ANALYSIS EVAPOTRANSPIRATION Thornthwaite Excess has 18 16 y = -0.5259x + 9.0047 decreased over 14 Excess Precip (in) 12 the past decade 10 8 6 4 2 0 -2 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 Year Yearly Thornthwaite Excess Period of Record Avg Linear (Yearly Thornthwaite Excess)
  • 4. TREND ANALYSIS EVAPORATION Evaporation Coefficient Evaporation 8 6 y = -0.5259x - 1.2353 excess has 4 Excess Precip (in) 2 decreased over 0 -2 -4 the past decade -6 -8 -10 -12 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 Year Yearly Excess Period of Record Avg Linear (Yearly Excess)
  • 5. Implications Coefficients for the District are “published” values but should be monitored Excess precipitation is dependent on volume of precipitation received
  • 6. Expectations Less Excess Precipitation = Less Natural Recharge Less Excess Precipitation = Losing Lakes and Wetlands
  • 7. Questions? Thank You Coon Creek Watershed District