Applied Finite Difference Method and Steady State for Groundwater Flow Modeling Phukham area, Xaysomboun Province, Lao PDR

S.Phoummixay1*, P.Sengprachanh2, Guillermo III Quesada Tabios3 1,2Department of Environmental Engineering, Faculty of Engineering, National University of Laos, 3Professor, Institute of Civil Engineering and Director of National Hydraulic Research Center, University of the Philippines, Diliman,Quezon City, Philippines 1101 *Corresponding author, E-mail:


Groundwater modeling is a common approach of conducting on groundwater flow and contaminant transport simulation. Consequently, in order to understand the behavior of groundwater flow. Therefore, the objective of this study is to establish and develop conceptual model of groundwater at Phukham Copper – Gold operations mining and simulate the steady state flow modeling. Groundwater Modeling System (GMS) 6.5 software was applied using MOFLOW Package which employ advanced mathematics as Finite Difference Method (FDM). Steady State Flow model was set up and calibrated within target ± 2 meters; then the model was run in MOFLOW in order to obtain acceptable observed and simulated hydraulic head by adjusting hydraulic conductivities and recharge values. Recharge rate was adjusted between 2% to 12% from annual rainfall 0.00475 m/d and it was found out to be 7.22 % or 0.000343 m/d. Model has come up with reasonable result of each scenario. Hence, root mean square error of steady state: layer1, layer 2, layer3 and layer4 are 1.840 m, 1.767 m, 1.963 m and 0.574 m, respectively. The coefficient of determination of steady state for layer1, layer2, layer3 and layer4 are 0.965, 0.96, 0.959 and 0.985, respectively