The riverbank filtration systems are playing a major role in water supply of Hungary. The 35 -40 % of Hungary’s water supply and about 75 % of our perspective water sources rely on these riverbank filtrated water sources.
In our work we deal with the seepage conditions of horizontal wells. Nowadays this well type, developed by Leo Ranney, is the most used water extract equipment for riverbank filtrated systems all over the world. The advantage of these well types that with the horizontal placement of the screens, we can increase the effective screen area, and we can provide bigger flowrate than the vertical wells in these geological situations. As we can experience, extreme water levels can be formed in our rivers, which can have the effect on the seepage conditions, and water treatment mechanism of riverbank filtrated systems. The MODFLOW software’s Multi Node Well 2 (MNW2) module can handle the hydrodynamic calculations of horizontal, and angled wells. Our aim is to test the suitability of MODLOW software package’s MNW2 module, for hydraulic modeling of Ranney wells. As a first step we would like to calibrate the MNW2 module, and for this we use other independent calculation methods. After the calibration we would like to use this module to determine real seepage conditions in existing riverbank filtrated systems.
With the help of hydraulic simulation, considering the extreme water levels of the rivers, we can optimize the operation of these type of horizontal wells, and we can react on extreme hydrological conditions in water supply.