#4- Comp Plan - Evaporation & Evapotranspiration

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#4- Comp Plan - Evaporation & Evapotranspiration

  1. 1. Evapotranspiration
  2. 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. 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. 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. 5. Implications Coefficients for the District are “published” values but should be monitored Excess precipitation is dependent on volume of precipitation received
  6. 6. Expectations Less Excess Precipitation = Less Natural Recharge Less Excess Precipitation = Losing Lakes and Wetlands
  7. 7. Questions? Thank You Coon Creek Watershed District

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