एक जलभृत (aquifer) जो नीचे से एक अभेद्य परत द्वारा सीमित होता है, लेकिन ऊपर से सीमित नहीं होता है, उसे क्या कहा जाता है?

In hydrogeology and fluid dynamics, the coefficient of permeability is also commonly referred to as:

In a coastal aquifer, the freshwater table is 2 m above mean sea level. Assuming the standard densities for freshwater (1.000 g/cm3) and saltwater (1.025 g/cm3), what is the approximate depth of the freshwater–saltwater interface below sea level according to the Ghyben–Herzberg relation?