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4. The Aggregate shapefile polygons were revised, and steps 2 through 3 repeated as necessary, <br />until acreage included in each surface or ground water aggregate was less than approximately <br />5,000 acres. <br />5. Non-key surface water structure tables for the 2001 and 2005 irrigate acreage snapshot were <br />combined to create a single list of active non-key diversion structures for each Aggregate ID <br />without duplicates. <br />6. Finally, there are 39 parcels (2005) that do not have a surface or ground water source that <br />receive "multi-use" water from Budweiser. These parcels are grouped into an aggregate <br />called 03_BUDUSE. <br />Results <br />Table l lists the aggregated surface water structures and associated acreage assigned to <br />Aggregates IDs for each year. As presented, there are 13 surface water aggregates that include <br />132 individual structures. There is a total of 9,427 acres include in surface water aggregates <br />2001. This represents approximately 1 percent of the tota12001 surface water acreage in the <br />South Platte Basin. <br />Table 2 lists 83 ground water aggregates and associated acreage assigned for each year. There is <br />a total of 167,247 acres include in ground water aggregates 2001. This represents 100 percent of <br />the total acreage with ground water as the only source in the South Platte Basin. <br />Figure 1 shows the acreage assigned to surface water and ground water aggregates for the five <br />acreage coverage years. As shown, ground water only acreage increased significantly between <br />the 1956 and 1976 coverages, likely because of improvements in technology. Ground water only <br />acreage remained relatively stable after South Platte Rules and Regulations were introduced in <br />1974 and decreased between the 1987 and 2001 coverages possibly due to competition for <br />augmentation sources. As shown in Figure 1, aggregate surface water structure acreage declines <br />over time, partly due to municipal development. Table 3 summarizes both key and aggregated <br />structure information by Water District for 2001. <br />Figure 2 and Figure 3 show the spatial boundaries used for surface and ground water <br />aggregation of the South Platte River basin. Exhibit A, attached, lists the surface water diversion <br />structures represented in each aggregate and their acreage by year. The ground water parcels <br />represented in each aggregate and the total acreage associated with each parcel by year maybe <br />found by looking at the comma separated value files associated with this task. <br />(1956GW_Agg.csv, 1976GW_Agg.csv, 1987GW_Agg.csv, 2001GW_Agg.csv, <br />2005GW_Agg.csv) <br />Page 3 of 19 <br />