20221115 15491500 1.0 TRUE SWF 1 in 30 year #https://data.gov.uk/dataset/2248ba88-3356-408e-b187-56b11bb0844d/risk-of-flooding-from-surface-water-speed-3-3-percent-annual-chance# Centre for Ecology & Hydrology NERC (CEH). Defra, Met Office and DARD Rivers Agency. Cranfield University. James Hutton Institute.