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• <br />Job #: 68838.64986.03.3.14 Calc By: N. Anton; M. Nelson <br />Client: Denison Mines CHK By: G. Hazen Date: 1/27/2009 <br />Project: Hydrogeology Report Date: 2/3/2009 Calc #: 1 <br />Detail: Water Balance Estimation of Percolation <br />The following are calculations for November (subscript 2): <br />Pi2 := 1.05 PET2 := 2.19 Ro2 := Pi2. 0.10 = 0.105 SmAC1 0 Total <br />Accumulated Sm <br />Ro2 Pi2 - Ro2 = 0.945 <br />MA2 Ro2 + SmAC1 = 0.945 Again, since MA2 is less than PET2, AET2 = MA2, and <br />there is no additional water left for soil moisture <br />AET2 := MA2 = 0.945 storage or percolation. <br />The following are calculations for December (subscript 3): <br />Pi3 := 0.85 PETS := 0.48 Ro3 Pi30 0.10 = 0.085 SmAC2 0 Total <br />Accumulated Sm <br />103 Pi3 - Ro3 = 0.765 <br />MA3 Ro3 + SmAC2 = 0.765 Now, MA3 is greater than PETS, so AET3 = PETS, and <br />the excess moisture goes to storage. <br />• <br />AET3 := PETS = 0.48 <br />SmMONTH3 Ro3 - AET3 = 0.285 Monthly Sm calculation. <br />SmAC3 SmMONTH3 = 0.285 Total accumulated Sm equals monthly Sm. <br />The following are calculations for January (subscript 4): <br />Pi4 := 0.88 PET4 := 0.47 Ro4 Pi4. 0.10 = 0.088 SmAC3 = 0.285 Total <br />Accumulated Sm <br />loo := Pi4 - Ro4 = 0.792 <br />MA4 104 + SmAC3 = 1.077 MA4 is again greater than PET4, so AET4 = PET4, and <br />the excess moisture goes to storage. <br />AET4 := PET4 = 0.47 <br />SmMONTH4 104 - AET4 = 0.322 Monthly Sm calculation. <br />SmAC4 SmMONTH4 + SmAC3 = 0.607 Total accumulated Sm equals current monthly Sm plus the <br />previous month's total accumulated Sm. <br />The following are calculations for February (subscript 5): <br />Pi5 := 0.76 PETS := 1.94 Roy := Pis • 0.10 = 0.076 SmAC4 = 0.607 Total <br />Accumulated Sm <br />Io5 := Pi5 - Ro5 = 0.684 <br /> <br />MathCAD V14 <br />N:\64986-Denison Mines\Task Order 3 - DMO <br />Saved 2/17/20095:15 PM <br />Page 7