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Calculation Brief <br />Evaluation of the Sensitivity of Percolation Estimates through <br />Mine Rock Stockpiles on the Simulated Precipitation Rate <br />The UNSAT-H estimates included in CDM (2009) used an HPR value of 0.1 cm/hr. <br />Although this precipitation rate does not account for high-intensity, short-term <br />precipitation events, it does provide a relatively higher estimated annual percolation <br />rate as compared to higher HPR values, based on this sensitivity analysis. <br />• <br /> <br />C:\Nelson_Work\Denlson\UNSAT_H\HPR sensbAtyWan 4 HPR Sensitivity talc bnef.doc