Climate change factors (CCF) for intensity–duration–frequency curves in the Community of Madrid (Spain) derived from CMIP6 downscaling

Desciption This dataset provides multi-model ensemble median climate change factors (CCF) for intensity–duration–frequency (IDF) curves at three AEMET pluviometric stations in the Community of Madrid, Spain: Torrejón (ID 3175), Madrid-Retiro (ID 3195) and Getafe (ID 3200). CCFs are defined as the ratio of future to historical Gumbel quantiles at a given return period, derived from a ten-member CMIP6 global climate model ensemble (ACCESS-CM2, BCC-CSM2-MR, CanESM5, CESM2-WACCM, CNRM-ESM2-1, EC-Earth3, MPI-ESM1-2-HR, MRI-ESM2-0, NorESM2-MM, UKESM1-0-LL) under four Shared Socioeconomic Pathways (SSP1-2.6, SSP2-4.5, SSP3-7.0, SSP5-8.5), statistically downscaled using the FIClima analogue-based method and bias-corrected via parametric quantile mapping. Values represent the multi-model, multi-scenario median (P50) across 40 model–scenario combinations. Three CSV files are provided, one per future time horizon relative to the 1985–2014 historical baseline: • Average_2016-2040.csv — near-term horizon • Average_2041-2070.csv — mid-century horizon • Average_2071-2100.csv — end-of-century horizon Each file contains three consecutive data blocks (separated by a repeated header row), corresponding to stations Torrejón (3175), Madrid-Retiro (3195) and Getafe (3200), respectively. Within each block: • Rows: return period T (years) = 2, 5, 10, 15, 25, 50, 100, 200, 500 • Columns: storm duration d (minutes) = 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 180, 360, 720, 1440 • Values: dimensionless CCF (ratio future/historical design intensity) CCFs below 1.0 indicate no statistically significant increase (frequent events at short durations); CCFs above 1.0 indicate intensification. To obtain future design intensities, multiply existing IDF values by the corresponding CCF: I_future(d,T) = CCF(d,T) × I_historical(d,T). These data support the revision of urban stormwater design standards in the Madrid metropolitan area and are directly applicable to existing IDF equations without requiring full hydrological modelling. Reference period: 1985–2014File format: semicolon-delimited CSV (UTF-8) Keywords intensity-duration-frequency · climate change factors · CMIP6 · statistical downscaling · urban drainage · extreme precipitation · Community of Madrid · IDF · stormwater Funding This study was supported by Canal de Isabel II under the project 'Servicios de Asistencia Técnica para la Realización de un Estudio de los Efectos del Cambio Climático en el Ciclo Urbano del Agua en la Comunidad de Madrid'