A full water footprint assessment consists of four distinct phases:
- Setting goals and scope.
- Water footprint accounting.
- Water footprint sustainability assessment.
- Water footprint response formulation.
Due to time and resource constraints, this study only includes the first two phases of a water footprint assessment.
In this study, water footprint takes into account green, blue and grey water footprints.
Blue water footprint presents the consumption of blue water resources (surface and ground water) along the supply chain of a product.
Green water footprint presents the consumption of green water resources (rainwater stored in the soil as soil moisture).
Grey water footprint is defined as the volume of freshwater that is required to assimilate the load of pollutants based on existing ambient water quality standards.