The water footprint of a process

How to calculate The green water footprint refers to the total volume of rainwater evaporated from fields or plantations, plus the water incorporated to the harvested crop. This is especially relevant for agricultural and foresty products How to calculate The blue water footprint of a process is calculated as the volume of surface and groundwater consumed. Consumption refers to the volume of freshwater used and then evaporated or incorporated into a product. It also includes water abstracted from surface or groundwater in a catchment and returned to another catchment or the sea. How to calculate The grey water footprint of a production process measures the freshwater pollution that can be associated with the process. It is defined as the volume of freshwater that is required to assimilate the load of pollutants based on natural background concentrations and existing ambient water quality standards.