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The SSI is a drought index based on the cumulative probability of a given monthly mean streamflow occurring for a given catchment. Here, the SSI is calculated for the following accumulation periods: 1, 3, 6, 9, 12, 18 and 24 months. Each accumulation period is calculated for calendar end-months. The standard period used to fit the Tweedie distribution is 1961-2010. \n\nThe SSI was produced by the RCUK-funded Historic Droughts project in order to characterise and explore hydrological drought severity over the period 1891-2015. This dataset is an outcome of the Historic Droughts Project (grant number: NE/L01016X/1).","distributionFormats":[{"name":"Comma-separated values (CSV)","type":"text/csv","version":"unknown"}],"distributorContacts":[{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"distributor","email":"info@eidc.ac.uk"}],"funding":[{"funderName":"Natural Environment Research Council","funderIdentifier":"https://ror.org/02b5d8509","awardTitle":"Historic Droughts","awardNumber":"NE/L01016X/1","orcid":false,"ror":true}],"id":"58ef13a9-539f-46e5-88ad-c89274191ff9","incomingCitationCount":3,"incomingCitations":[{"description":"West, H., Quinn, N., & Horswell, M. (2022). Spatio-temporal propagation of North Atlantic Oscillation (NAO) rainfall deviations to streamflow in British catchments. In Hydrological Sciences Journal (Vol. 67, Issue 5, pp. 676–688). Informa UK Limited","url":"https://doi.org/10.1080/02626667.2022.2038791"},{"description":"Smith, K.A., Barker, L.J., Tanguy, M., Parry, S., Harrigan, S., Legg, T.P., Prudhomme, C., & Hannaford, J. (2019). A multi-objective ensemble approach to hydrological modelling in the UK: an application to historic drought reconstruction. In Hydrology and Earth System Sciences (Vol. 23, Issue 8, pp. 3247–3268). Copernicus GmbH.","url":"https://doi.org/10.5194/hess-23-3247-2019"},{"description":"Barker, L.J., Hannaford, J., Parry, S., Smith, K.A., Tanguy, M., & Prudhomme, C. (2019). Historic hydrological droughts 1891-2015: systematic characterisation for a diverse set of catchments across the UK.Hydrology and Earth System Sciences, 23(11), 4583-4602.","url":"https://doi.org/10.5194/hess-23-4583-2019"}],"infoLinks":[{"url":"https://data-package.ceh.ac.uk/sd/58ef13a9-539f-46e5-88ad-c89274191ff9.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this dataset","function":"information","type":"OTHER"}],"inspireThemes":[{"theme":"Hydrography","uri":"http://inspire.ec.europa.eu/theme/hy"}],"keywordsOther":[{"value":"Drought Inventory"},{"value":"Drought Catalogue"},{"value":"Drought Indicator"},{"value":"SSI"},{"value":"Standardised Streamflow Index"},{"value":"drought","uri":"http://www.eionet.europa.eu/gemet/concept/2347"},{"value":"catchment","uri":"http://www.eionet.europa.eu/gemet/concept/12231"},{"value":"water scarcity","uri":"http://www.eionet.europa.eu/gemet/concept/15332"}],"keywordsPlace":[{"value":"United Kingdom","uri":"http://sws.geonames.org/2635167"}],"keywordsProject":[{"value":"Historic Droughts"}],"licences":[{"value":"This resource is made available under the terms of the Open Government Licence","code":"license","uri":"https://eidc.ac.uk/licences/ogl/plain"}],"lineage":"The SSI is calculated as defined in Svensson, et al., (2017 https://doi.org/ 10.1002/2016WR019276) and is based on the cumulative probability of a given monthly mean streamflow occurring for a given catchment. Here the SSI is calculated for the following accumulation periods: 1, 3, 6, 9, 12, 18 and 24 months. The Tweedie distribution was fitted to each accumulated time series of monthly mean flows. The 'SCI' package for R was used to calculate the SSI and a new function was written to enable the SCI package to call the 'tweedie' package for R. The input data used is monthly mean streamflow derived from modelled reconstructed streamflow (Smith et al., 2018 https://doi.org/10.5285/f710bed1-e564-47bf-b82c-4c2a2fe2810e). Data were exported in comma separated value files (.csv format) and ingested into the EIDC.\n\n","metadataDate":"2026-06-29T16:24:55","notGEMINI":false,"onlineResources":[{"url":"https://catalogue.ceh.ac.uk/datastore/eidchub/58ef13a9-539f-46e5-88ad-c89274191ff9","name":"Download the data","description":"Download a copy of this data","function":"fileAccess","type":"OTHER"},{"url":"https://data-package.ceh.ac.uk/sd/58ef13a9-539f-46e5-88ad-c89274191ff9.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this dataset","function":"information","type":"OTHER"}],"pointsOfContact":[{"familyName":"Barker","givenName":"Lucy","organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"pointOfContact","email":"enquiries@ceh.ac.uk","address":{"deliveryPoint":"Maclean Building, Benson Lane, Crowmarsh Gifford","city":"Wallingford","administrativeArea":"Oxfordshire","postalCode":"OX10 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