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Abstract
In the present paper a procedure for the construction of Synthetic Design Hydrographs (SDH) for ungauged sites is proposed, based on the regional estimation of Flood Duration Frequency (FDF) and Peak‐Duration (PD) curves.
The basic hypothesis is that the reduction ratio between the quantiles of maximum average discharge in given duration and peak discharge is independent of the return period, which in practice occurs for medium‐large catchments. Under this assumption the regional estimation of FDF curves reduces to the estimation of peak discharge quantiles and reduction ratio.
The procedure has been applied to the Po river in Italy, employing for the calibration the historical flood waves recorded at eight gauging stations along the river.
The regional estimates of SDHs have been compared with the local ones obtained at the gauging stations. At two consecutive upstream stations, the comparison reveals and partly rectifies some clear data inconsistencies due to uncertainties in stage‐discharge relationships.
The proposed model provides an operational tool for hydrologic risk assessment and flood protection planning along the entire course of the Po river. Moreover, the regionalisation procedure is quite simple and its validity is not restricted to the specific case presented in this paper
