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<br />of error. As such, any roots that are less than 4 inches deep are considered to be in <br />extremely poor health. In this case, poor health refers to the inability of the grass to <br />withstand extreme temperatures, drought, and disease. <br /> <br />Head Type 0/0 ~ 6 inches 0/0 ~ 4 inches 0/0 < 4 inches <br />Sprays 17.8 64.5 35.5 <br />Rotors 13.5 57.5 42.5 <br />Total 16.2 61.8 38.2 <br /> <br />Evapotranspiration (0/0 Over/Under-watered) <br />Evapotranspiration (ET) is the loss of water by evaporation from the soil and <br />transpiration from plants. Historical climatic averages show that Kentucl<y Blue grass <br />along the Front Range needs 27 inches of water during the growing season (May - Sept) <br />to replace the amount of water lost to evapotranspiration. By utilizing individual water <br />records to derive outdoor water use, the amount over/under-watered (% ET) in a given <br />year for each household can be estimated. <br /> <br />The graphs below display the watering trends for select years for households that <br />received an irrigation inspection in 2006. The cities of Golden, Greeley and Westminster <br />were eliminated from this analysis due to unusable water records for these years. Also <br />note that in 2005 more households were analyzed as compared to 2004. This is partly <br />due to an increase of new households in 2005 as well as a lacl< of information available <br />for 2004. <br /> <br />2005 Watering Practices of Households Audited in 2006 as Compared to <br />Front Range Historical Evapotranspiration (ET) Rate <br /> <br />120 <br />100 <br />80 <br />60 <br />40 <br />20 <br />o <br /> <br /> <br />I_ # of households 1 <br /> <br /><-100 -100 -8010-6010-4010-20100102010401060108010 >100 <br />10 -81 -61 -41 -21 -1 19 39 59 79 99 <br /> <br />0/0 Over/Under ET <br /> <br />8 <br />