The impact of a single drop onto a plane shallow and deep liquid pool is studied numerically by solving the Navier-Stokes equations coupled with a Volume of Fluid (VOF) method and using a dynamic mesh adaption technique. The methodology is first validated via the crater dynamics by solving the flow field using an axisymmetric formulation of the Navier-Stokes equations. Temporal evolution of the horizontal crown size, the ejected mass fraction and the child droplet characteristics are then analysed in detail and compared to available literature. The investigation aims the development of a robust, efficient and accurate numerical methodology that offers the ability to easily investigate the influence of fluid properties and impact scenarios over a wide range of parameter hence to improve and extend available empirical correlations. The numerical methodology is robust, requires only reasonable computational time and gives promising accuracy compared to experimental results.