# EOS WATER¶

Defines the water properties such as density, viscosity and enthalpy, and the surface density. For example:

EOS WATER
SURFACE_DENSITY 1000.0 kg/m^3
END


The above is the minimum required input, where the surface density is specified, while the other properties are defaulted to use standard water tables, IFC67.

When the GAS_WATER mode is used, the water viscosity is modelled by default with the Batzle and Wang correlation to account for brine salinity.

The following modelling options are available for the water properties:

Different type of models can be selected for different properties, however mixed selections should be assessed carefully. Properties for which no models have been selected will default to the IFC67 water tables.

## SURFACE_DENSITY specification of water surface density¶

This keyword specifies the density of the aqueous phase at surface conditions. This may include any dissolved salts and the effect of the surface temperature. The surface density value is used to convert fluid flows in the reservoir into surface volume flows. Surface volumes are used to specify required well rates with targets like TARG_WSV, and surface volume rates and totals are reported in the Mass file and in the Eclipse files. The surface density must be entered or the software will return an error. The density units are optional, if not entered are defaulted to kg/m^3.

An example is:

SURFACE_DENSITY 1004.2 kg/m^3