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5. If an aggregate structure was greater than 1,500 acres, and there were two or more distinct <br />areas of ground water only parcels, the parcels were split based on visual inspection into <br />more than one "structure" and assigned a letter designator, such as " 25URF17a" and <br />" 25URF 17b". <br />6. Some ground water only parcels fall outside of defined URF zones. These were grouped by <br />water district and assigned a URF zone of 0, such as "35URF0". <br />7. A table consisting of the results of Steps 1 - 6 (groundwater-only structure name, and <br />associated irrigated parcels) was created to provide direct input into "aggregate" commands <br />for the CDSS DMIs. <br />Results <br />Ground water only parcels were assigned to 60 separate "structures" (Table 1). As presented in <br />Table 1, the "structures" account for a varying amount of acreage, from as little as 16 acres <br />(24URF84) to as much as 7,400 acres (27URF24). The parcel assignments to the 60 <br />groundwater-only structures have been made within command files to execute the DMIs watright <br />and demandts for creation of StateMod input files. <br />Figure 1 shows the URF zones and associated ground water only parcels. <br />Comments and Concerns <br />Eight ground water only structures consist of more than 1,500 acres. In most cases, these <br />relatively large aggregated areas are associated with center pivots, as well as corners also <br />receiving some supply from the ground water source. The decision was made not to break these <br />areas up into separate "structures" because they logically belonged together, as in the case of the <br />parcels serving the "North Star Farm" near Saguache. <br />The work described in this memorandum was performed by the Consumptive Use Contractor to <br />the RGDSS project (Leonard Rice Consulting Water Engineers) to simplify the effort required to <br />include irrigated acreage updates. When future revisions and updates are made to irrigated <br />acreage and ditch service area mapping, assignments parcels to ground water only structures must <br />also be revisited and updated as necessary. <br />C:\cdss\Task8-l.doc Groundwater Only Lands July 6, 2000 -Page 2 of 5 <br />