Flood Frequency Quantification for Ungauged Sites using Continuous Simulation: a UK approach

The paper outlines recent and ongoing research addressing the quantification of river floodfrequencies at ungauged sites across Britain. The approach is one of modelling continuous time series ofcatchment runoff. Model parameters are established where data permit: the spatial generalisation toungauged sites is effected by relating model parameters to widely available catchment properties which thenprovide the route to model use in data-sparse areas. The particular aspects of research described are (i) themerging of data of different time discretisation, (ii) considerations in the calibration of parameter-sparserainfall-runoff models, (iii) considerations of site similarities in spatial generalisation and (iv) quantificationof uncertainties arising from parameter estimation.