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South Platte River Basin Dataset <br />Three years of monthly pumping records (2003 through 2005) associated with numerous <br />wells located in the vicinity of Julesburg were reviewed. Using the WDID's and the <br />3/15/2006 version of the 2001 Irrigated Lands Assessment provided by the SPDSS GIS <br />contractor (RTi), six wells that use ground water as the sole source were identified. The <br />other wells provide a supplemental supply to lands that are also irrigated with surface <br />water supplies. These wells were not considered because additional information <br />regarding surface water supplies, which is required for this analysis, was not provided. <br />Historical pumping records were compared to estimated pumping, which was based on <br />IWR from a modified Blaney-Griddle analysis using the SPDSS calibrated coefficients <br />for Julesburg. The IWR was divided by an estimated application efficiency of 80% for <br />sprinklers to estimate pumping. The results are shown below in Figure 1. For a given <br />year, the peak monthly percent deficit irrigation varies between wells from around thirty <br />percent to over 250 percent. For a given well, the pattern was not consistent across the <br />three years of data. <br />Northern High Plains Dataset <br />Several years of annual pumping estimates associated with fourteen sole source wells <br />located in the Northern High Plains area were reviewed. The period of record spanned <br />Task 77.doc 6 of 8 <br />Figure 1. Deficit Irrigation Estimates Using Monthly Data for Wells near Julesburg <br />