1021 Figure 74 – Soil-Water Characteristic Curve of Materials Likewise, saturated permeability also varies as a function of depth due to the same reason: changes in the void ratio. This variation directly affects the permeability value and, under unsaturated conditions, the permeability function. This variation can be observed in Figure 75. Figure 75 – Permeability in function of depth 3.2 Boundary Conditions Annual and monthly precipitation at the site was evaluated primarily based on records from a station located in the Peruvian highlands. Annual precipitation at the project site, in proportion to these records, ranges from 296 mm to 1,091 mm. The monthly distribution of precipitation in an average year shows that approximately 80% of the total annual precipitation occurs during the rainy season, from December to March, with a maximum average monthly precipitation of 176 mm in January. For the evaporation analysis in the project area, evaporation data were collected from SENAMHI meteorological stations, whose elevations range from 3,380 to 4,250 m.a.s.l. The net precipitation boundary condition is shown in Figure 76. It should be noted that this boundary condition is applied depending on the zone of the deposit, whether structured or unstructured. 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 1E-02 1E-01 1E+00 1E+01 1E+02 1E+03 1E+04 Volumetric content of water, (cm3/cm3) Matric Suction, (kPa) Depth 0 - 5 m Depth 5 - 10 m Depth 10 - 20 m Depth 20 - 30 m Depth 30 - 50 m Depth 50 - 70 m Drain 0 10 20 30 40 50 60 70 1E-13 1E-12 1E-11 1E-10 1E-09 Depth (m) Permeability (m/s)
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