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<br />OJ19'i7 <br /> <br />3. 1,317 ac-ft subtracted from NMMinorlRCHilIToFarm:NonIRDep. <br /> <br />4. 1,965 ac-ft attributed to Chaco non-irrigation depletions. <br /> <br />Line items 3 and 4 sum to 3,282 ac-ft. This was mapped by the USBR as 1400 ac-ft for <br />Scattered Rural, 65 ac-ft for Fish & Wildlife, and 1,817 ac-ft for Stockponds from subunits 3, 6, <br />5, and 7. There was not an object on the San Juan available in the Model from which to deduct <br />this volume (3,282 ac-ft). Therefore, 1,317 ac-ft was taken from the Animas and the remainder <br />(1,965 ac-ft) was attributed to the Chaco. <br /> <br />Other off stream depletions identified: <br /> <br />5. Chaco River- approximately 4,608 ac-ft. ChacoRiverDivs:NonIR and IrSum were set to <br />zero in the Model and 4,608 ac-ft was subtracted from the AnimasToLaplataGains:Local <br />Inflow. We assume 1,965 ac-ft of this, accounts for the categorized baseline line item <br />depletions described above. <br /> <br />6. Whiskey Creek- 649 ac-ft. Unit8Depletions: NonIR and IrSum were set to zero in the <br />Model and subtracted from McElmoToBlufGains:LocalInflow. <br /> <br />7. Arizona- 12,419 ac-ft. ArizonaDepletions:NonIR and IrSumDepletion were set to zero in <br />the Model and subtracted from McElmoToBlufGains:LocaIInflow. <br /> <br />8. Utah- 10,929 ac-ft. Set to an average of 1705 ac-ft/year in UtahDepletions:IrSum and <br />set to zero in UtahDepletions:NonIrDepletion while 9,224 ac-ft was subtracted from <br />McElmoToBlufGains:Loca1Inflow. <br /> <br />Table 2-8 shows a summary of the identified off-stream depletions and the corresponding volume of <br />water accounted for in the gain loss files as well as objects adjusted. Chaco, Whiskey Creek, and <br />Arizona depletions were modified from what the USBR had originally configured in the Model for <br />1929 to 1969. To adjust the offstream depletions the corresponding depletions used in the derivation <br />of the Natural Flows had to be subtracted. This necessitates using the baseline model depletions for <br />1929 to 1974 and validation model depletions for 1975 to 1993. The 1929 to 1970 depletions were <br />adjusted based on information contained in The Comprehensive Framework Study, May I, 1969 by the <br />Soil Conservation Service. Since the USBR depletion pattern remains the same, the monthly values <br />were scaled to match the figures contained in the referenced document. Depletions for the post-1969 <br />period were not modified but come from a combination of Baseline and Validation configuration <br />models. <br /> <br />The Utah depletions were modified for the 1929 to 1969 period based on data contained in The <br />Hydrologic Inventory of ColoradiJ, Dolores and San Juan Study Units, Utah Division of Water <br />Resources, September 1987. For Utah, the same monthly values were used each year. A main stem <br />irrigation depletion of 1705 ac-ft per year remains configured in the Model. Table 2-9 shows the <br />modified depletions based on the referenced documents distributed between M&I and Irrigation for <br />the pre- and post 70's periods. <br /> <br />DRAFT - SJRIP Hydrology Model Documentation <br />June 18, 1999 <br /> <br />38 <br />