Barker, L.J.; Smith, K.A.; Svensson, C.; Tanguy, M.; Hannaford, J.

Historic Standardised Streamflow Index (SSI) using Tweedie distribution with standard period 1961-2010 for 303 UK catchments (1891-2015)

This dataset contains the Standardised Streamflow Index (SSI) data for 303 catchments across the United Kingdom from 1891 to 2015. 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.

The 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).

Publication date: 2018-03-12

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Supporting documentation

Format of the dataset : Comma-separated values (CSV)

Access and use conditions

This resource is made available under the terms of the Open Government Licence

You must cite: Barker, L.J.; Smith, K.A.; Svensson, C.; Tanguy, M.; Hannaford, J. (2018). Historic Standardised Streamflow Index (SSI) using Tweedie distribution with standard period 1961-2010 for 303 UK catchments (1891-2015). NERC Environmental Information Data Centre. https://doi.org/10.5285/58ef13a9-539f-46e5-88ad-c89274191ff9

 

© Centre for Ecology & Hydrology (Natural Environment Research Council)

This dataset is part of the following

Where/When

Study area
Temporal extent
1891-01-01    to    2015-11-01

Provenance & quality

The SSI is calculated as defined in Svensson, et al., (2017; doi: 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; doi: 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.

Correspondence/contact details

Barker, L.J.
Centre for Ecology & Hydrology
Maclean Building, Benson Lane, Crowmarsh Gifford
Wallingford
Oxfordshire
OX10 8BB
United Kingdom
enquiries@ceh.ac.uk

Authors

Barker, L.J.
Centre for Ecology & Hydrology
Smith, K.A.
Centre for Ecology & Hydrology
Svensson, C.
Centre for Ecology & Hydrology
Tanguy, M.
Centre for Ecology & Hydrology
Hannaford, J.
Centre for Ecology & Hydrology

Other contacts

Custodian
Environmental Information Data Centre
Publisher
NERC Environmental Information Data Centre

Spatial

Spatial representation type
Tabular (text)
Spatial reference system
OSGB 1936 / British National Grid

Tags

Topic categories
Inland Waters , Environment
INSPIRE Theme
Hydrography
Keywords
Catchment,  Drought,  Drought Catalogue,  Drought Indicator,  Drought Inventory,  Historic Droughts,  SSI,  Standardised Streamflow Index,  United Kingdom Water Scarcity