Water Impact Index
The WiiX Tool allows you to evaluate the water footprint of your municipal or industrial activities (for more details see "About the WIIX Tool" below). To calculate a WiiX, you need the following data: quantity and quality of water withdrawn and released, energy and chemicals consumed by the water cycle, waste disposal. To begin, follow the directions below.
Description of Your Activity
The WIIX calculator allows you to input up to three activities for comparison. The variables for each activity can be changed, allowing you to determine how different water management decisions affect your Water Impact Index.
Units of Measurement
Most water footprints focus almost exclusively on volume. This is excellent for raising awareness -- but it's insufficient for representing the impact to a water resource. That's why the WIIX integrates two additional factors in addition to volume: the availability of local water resources (water stress) and water quality.
By incorporating these additional factors, the WIIX better reflects the overall impact of water use. Results are expressed in a a rational (or theoretical) unit of cubic meters or gallons known as the "m3 Water Impact Index equivalent". Put simply, a high WIIX indicates a high level of impact. A low WIIX indicates a lower impact level.
Water Stress Index (WSI)
The Water Stress Index (WSI) indicates the amount of stress placed on water resources in the location you specified. The index used in this simulation tool is calculated with the method identified by S. Pfister*.
A value close to 1 indicates severe water stress, while a value close to 0 indicates low water stress. The value is based on the location of your activity.
If you want to manually input a more specific WSI to your locality, you can refer to the Google Earth-based WSI World database.
To use this database file, download and install Google Earth
*Reference : Pfister S, Koehler A, Hellweg S (2009) Assessing the environmental impact of freshwater