Data on surface water bodies like rivers, dams, reservoirs, and related  flow characteristics, along with assessments for water risks, stress, and flood risk. 

freshwater

Freshwater

Data related to water scarcity, water quality, flood risk, and water stress.

water-risks

Water Risks

### Overview  
  
Seasonal variability measures the average within-year variability of available water supply, including both renewable surface and groundwater supplies. Higher values indicate wider variations of available supply within a year. These values were then converted into risk scores based on the thresholds defined in the methodology. These risk scores range from low variability (coefficient of variation <0.33) to extremely high variability (coefficient of variation >1.33). Seasonal variability values are available per sub-basin (HydroBASIN level 6).  
  
### Methodology  
  
Aqueduct used the global hydrological model, PCRaster Global Water Balance (PCR-GLOBWB
2), to calculate five indicators. Seasonal variability is one of those indicators and was calculated using the available water supply time series from the default PCR-GLOBWB 2. 

  
  
Seasonal or within-year variability is defined as the coefficient of variation (CV) of available water between months in a year for each sub-basin. The CV was calculated by dividing the standard deviation (SD) of the available water supply within a year by the year’s mean available water supply.

  
  
Finally, raw baseline seasonal variability were converted to risk scores between 0 and 5, based on quantiles. These scores were placed into categories indicating how high the risk for this indicator is. The thresholds for raw seasonal variability values and the corresponding risk scores that were used in each category are defined below as Risk Category (Risk Scores): Raw Value Thresholds.

- Low (0-1): < 0.33
- Low to medium (1-2): 0.33 - 0.66
- Medium to high (2-3): 0.66 - 1.0
- High (3-4): 1.0 - 1.33
- Extremely high (4-5): > 1.33

  
  
For the full documentation, please see the source [methodology](https://www.wri.org/publication/aqueduct-30).  
  
### Additional Information  
  
Resource Watch shows only a subset of the dataset. For access to the full dataset and additional information, click on the “Learn more” button.  
  
### Disclaimer  
  
Excerpts of this description page were taken from the source metadata.

Seasonal Variability, Aqueduct 3.0

wat-053-aqueduct-seasonal-variability-crt

water-peace-security

Water, Peace & Security

1960-2014 Seasonal Variability of Available Water Supply

Measures the average within-year variability of available water supply, including both renewable surface and groundwater supplies

Water, Peace & Security

Aqueduct Seasonal Variability

1960-2014 Seasonal Variability of Available Water Supply