ARANZ Geo Leapfrog Hydro v2.6.0 Leapfrog Hydro is a 3D modelling tool that builds lithology models from even small amounts of data. Its powerful implicit modelling engine builds models directly from boreholes, points and surfaces. Leapfrog Hydro interoperates with MODFLOW and FEFLOW, making it easy to use lithology models as the basis for flow models. Leapfrog Hydro helps you to get the geology right; Everything else flows from that.