2. Material and Methods
In this study, changes in hydraulic gradient due to natural recharge, and changes in hydraulic conductivity of pond bed due to temperature-induced water viscosity were quantified. Two groundwater flow models were developed to identify variations in the average linear vertical flow velocities of water with variations in hydraulic conductivity of pond bed occurring over time. This study used observed data from St-André, Belgium to understand the water movement below the infiltration basin and the seasonal variation of hydraulic conductivity under different seasonal conditions. Additionally, it was assumed that the infiltration ponds are connected to the groundwater, therefore there is no unsaturated zone between the ponds and the groundwater table.