Laserfiche WebLink
Mr. Timm Comer <br />Manager, Environmental Resources <br />ADR Water Line <br />January 3, 2010 <br />amen <br />pipes (if it occurred) would immediately express itself at the surface of the embankment (the <br />path of least resistance). Water from the pipelines would also seep into the compacted <br />structural, saturating a portion of the fill. <br />To assess the extent of saturation within the structural fill, a seepage analysis was conducted. <br />Since this problem involves unsaturated flow, the numerical model TOUGHV2 was used. <br />TOUGHV2 (Pruess et al, 1999) is a multi-dimensional numerical model for simulating the <br />coupled transport of water, vapor, air, and heat in porous and fractured media. TOUGHV2 takes <br />account of fluid flow in both liquid and gaseous phases occurring under pressure, viscous, and <br />gravity forces according to Darcy's law. Interference between the phases is represented by <br />means of relative permeability functions. The hydraulic conductivity (permeability) of the <br />structural fill has not been measured, however based on its gradation (minus 24 inch with 0 to <br />25 percent fines), it has been estimated to range between 1 x 10"2 to 1 x 10 a centimeters per <br />second (cm/s). <br />Figures 1 through 3 present predicted saturation profiles within the PSSA embankment due to <br />pipeline failure, for assumed structural fill hydraulic conductivity of 1 x 10-2, 1 x 10"3, 1 x 10-4 <br />cm/s, respectively. In these figures, the red hue indicates near saturated fill, while the blue hue <br />indicates unsaturated fill. <br />MACINTOSH HD:USERS:JLUPO:D000MENTS:CCBV:WATER LINE lettecdoc 2 <br />Figure 1 Saturation Profile 1 x 10"2 cm/s