Available Blue Water
Available blue water (Ba) is the total amount of water available to a catchment before any uses are satisfied. It is calculated as all water flowing into the catchment from upstream catchments minus upstream consumptive use plus runoff in the catchment.
Access to Water
Access to water measures the percentage of population without access to improved drinking-water sources. Higher values indicate areas where people have less access to safe drinking water, and consequently higher reputational risks to those not using water in an equitable way.
Total withdrawal is the total amount of water removed from freshwater sources for human use.
Upstream Protected Lands
Upstream protected land measures the percentage of total water supply that originates from protected ecosystems. Modified land use can affect the health of freshwater ecosystems and have severe downstream impacts on both water quality and quantity.
Total Blue Water
Total blue water (Bt) for each catchment is the accumulated runoff upstream of the catchment plus the runoff in the catchment.
Flood Occurrence is the number of floods recorded from 1985 to 2011.
Consumptive use is the portion of all water withdrawn that is consumed through evaporation, incorporation into a product, or pollution, such that it is no longer available for reuse. Non-consumptive use is the remainder of withdrawals that is not consumed and instead returns to ground or surface water bodies.
Baseline Water Stress
Baseline water stress measures total annual water withdrawals (municipal, industrial, and agricultural) expressed as a percent of the total annual available flow. Higher values indicate more competition among users.