6dba3fa2-e5eb-4194-9834-200db4e96687 eng Surface Water Supply Index (SWSI) N/A N/A N/A http://www.droughtmanagement.info/indices/ 2022-02-07T11:04:22 ISO 19115:2003/19139 1.0 http://www.droughtmanagement.info/indices/ Spatial_reference EPSG 7.9 Surface Water Supply Index (SWSI) N/A > N/A N/A http://www.droughtmanagement.info/indices/ This index can be used to determine and characterizehydrological drought hazards on a monthly basis at river basin scale. (source WMO and GWP, 2016) Mapping hydrological drought hazard N/A N/A, N/A N/A P0Y0M0DT0H0M0S https://droughtcatalogue.com/thumbnails/Global_Indices.png thumbnail https://droughtcatalogue.com/thumbnails/Global_Indices.png large_thumbnail Type: Indices Type of Drought: Hydrological Drought Application: Mapping hydrological drought hazard Extent: Not relevant Reservoir storage, streamflow, snowpack and precipitation. N/A Aggregation period: N/A Spatial scale: River basin eng Not relevant 1 -180 180 -90 90 Not relevant Not relevant Various http://www.droughtmanagement.info/indices/ http://www.droughtmanagement.info/indices/ Not relevant -180 180 -90 90 Mapping hydrological drought hazard N/A N/A 1 Codelist omission 1 Data requirements to use: Reservoir storage, streamflow, snowpack and precipitation.; Data used: N/A; Data format: N/A; Data access: N/A; Concise description: Takes into account the work done by Palmer with PDSI but adds additional information including water supply data (snow accumulation, snowmelt and runoff, and reservoir data), and is calculated at the basin level. SWSI identifies the approximate frequency of mild drought occurrence at 26%–50%, moderate drought occurrence at 14%–26%, and severe drought occurrence at 2%–14%. Extreme drought occurs approximately less than 2% of the time. Surface Water Supply Index (SWSI) This index can be used to determine and characterizehydrological drought hazards on a monthly basis at river basin scale. (source WMO and GWP, 2016) Indices Hydrological Mapping hydrological drought hazard N/A Takes into account the work done by Palmer with PDSI but adds additional information including water supply data (snow accumulation, snowmelt and runoff, and reservoir data), and is calculated at the basin level. SWSI identifies the approximate frequency of mild drought occurrence at 26%–50%, moderate drought occurrence at 14%–26%, and severe drought occurrence at 2%–14%. Extreme drought occurs approximately less than 2% of the time. http://www.droughtmanagement.info/indices/ N/A N/A Calculations and an explanation of the methodology are provided in the references. N/A Doesken, N.J. and D. Garen, 1991: Drought Monitoring in the Western United States using a Surface Water Supply Index. Preprints, Seventh Conference on Applied Climatology, Salt Lake City, UT. American Meteorology Society, 266–269. Doesken, N.J., T.B. McKee and J. Kleist, 1991: Development of a Surface Water Supply Index for the Western United States. Climatology Report 91-3, Colorado Climate Center, http://climate.colostate.edu/pdfs/climo_rpt_91-3.pdf. Shafer, B.A. and L.E. Dezman, 1982: Development of a Surface Water Supply Index (SWSI) to Assess the Severity of Drought Conditions in Snowpack Runoff Areas. Proceedings of the Western Snow Conference, Colorado State University, Fort Collins, CO, 164–175. Taking into account the full water resources of a basin provides a good indication of the overall hydrological health of a particular basin or region. As data sources change or additional data are included, the entire index has to undergo a recalculation to account for these changes in the inputs, making it difficult to construct a homogeneous time series. Since calculations may vary between basins, it is difficult to compare basins or homogeneous regions. N/A