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SPDSS Memorandum <br />Final <br />To: Ray Alvarado, Ray Bennett, Tim Martin, Nils Babel, Les Dalby, Jim Hall <br />From: LRE, Erin Wilson, Beorn Courtney, and Mark Mitisek <br />Subject: Task 52 -Review of Irrigated Acreage in Division 1 and Water District 47 <br />Date: Initial Review May 2, 2006 <br />Finalized with Resolutions November 17, 2006 <br />Introduction <br />The purpose of this memorandum is to document the review of irrigated acreage assigned <br />to surface water diversion structures located in the SPDSS study area. Questions were <br />provided to RTi and Division 1 staff and they investigated as time permitted. This <br />memorandum was updated as questions were resolved. <br />Key surface water diversion structures, identified in Phase 1 Task 3 efforts, include <br />structures representing 85 percent of net decreed surface water rights, structures diverting <br />greater than 1,000 acre-feet per year, and structures of administration importance. A <br />detailed review of diversion records and water rights is being performed for key <br />structures by Water District in Phase 3, Task 3. Additional discrepancies in the irrigated <br />acreage assessment based on diversion records were highlighted in the Task 3 analyses. <br />For example, if the diversions for irrigation compared to acreage yield questionable <br />results, it was noted along with resolutions in the Irrigated Acreage section of the Task 3 <br />memoranda. Those discrepancies are not noted in this memorandum. The Task 3 <br />memoranda were also forwarded to RTi and to the water commissioners to understand if <br />there was an issue with diversion records or acreage assignments. <br />Table 1 shows the total irrigated acreage, based on the 3/15/06 version of the 2001 <br />Irrigated Lands Assessment provided by RTi, broken down based on key surface water <br />structures, non-key surface water structures, and acreage irrigated with ground water <br />only. Note that both key and non-key surface water structures may also be supplemented <br />with ground water. Although a more detailed analysis of key surface water structures <br />diversion records and water rights are being performed, as noted above, all surface water <br />and ground water acreage will be represented in future modeling efforts. <br />1of12 <br />