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Calculation Brief <br />Estimation of Percolation Through Development Rock Areas Using UNSAT-h <br />0 <br />Table 1. Summary of UNSAT-h modeling results (all results in centimeters). <br />• <br />Model Run Annual Annual Annual Annual Annual Annual <br /> Potential Precipitation Actual Runoff Infiltration Percolation <br /> ET (in.) (in.) Evap. (in.) (in.) (in.) <br /> (in.) <br />West 67.0 12.8 12.7 0.0527 12.7 0.0103 <br />Sunday- <br />Average <br />Precipitation <br />West 67.0 19.9 18.07 0.190 19.7 0.0106 <br />Sunday- <br />Wettest year <br />on Record <br />Topaz- 67.0 12.8 12.7 0.0185 12.7 0.00822 <br />Average <br />Precipitation <br />Topaz- 67.0 19.9 18.1 0.0619 19.8 0.00849 <br />Wettest year <br />on Record <br />Based on the UNSAT-h simulations, the estimated basal liquid flux is estimated to <br />range from 0.027 to 0.034 centimeters per year. The simulations show the importance <br />of evaluating upward movement of water from the rock piles caused by evaporation <br />because the majority of water that infiltrates the surface of the development rock piles <br />evaporates in the semi-arid environment present at the Sunday Mines Group. <br />Data regarding mass balance errors for the UNSAT-h simulations are included in <br />Attachment 7. The annual mass balance errors for the simulations summarized in <br />Table 1 range from 1.8 x 10-4 to 5.4 x 10-5 centimeters. <br />A sensitivity analysis was also run in which several model inputs were varied to <br />examine the effect of the changes. This information is summarized in Table 2. <br />5 <br />• CDM <br />T:\&1986-Denison Mines\Task Order 3 - DMO Sampling and Analysis Plan\Task 3.12 - Soil, Ore, Rock Data Assessment Repod\Unsal_h models\final models\Final Repor6calc brie(.doc