The water supply and demand index is the balance between the availability of water in the watershed, environmental flow requirements, and the water demand by different economic sectors.
How is it scored?
The water supply and demand index is the amount of water used by different sectors in a given period of time by spatial area relative to the surface water supply available for the same temporal and spatial units. (IDEAM, 2010a). The considered economic sectors are: agriculture, industry, services, energy, aquaculture and non-consumed water. The last one refers to the irrigation efficiency (in regards to the agriculture) and the water that wasn’t accounted in the other sectors. Each station has an average water supply and demand value. The scores for all stations in each basin are averaged together. This value is then converted from the condition scoring by IDEAM to the 20-point scale.