A method for indirect estimation of design flood in poorly gauged urbanized river basins is presented. It is based on the critical flood design criterion that maximizes peak flow for a given return period by transforming precipitation of depth duration frequency curve into runoff. In order to keep into account the variegated land cover of urbanized river basins, a spatially distributed hydrological model is employed. The paper shows that indirect method provides design discharges significantly greater respect to direct method when discharge measurements are strongly affected by upstream river overflows like in highly urbanized area. Indirect method, in addition to direct method, provides design hydrograph that is useful for those cases where design discharge only is not sufficient for designing or planning purposes.
Assessing design flood in urban area using a distributed hydrological model
RAVAZZANI, GIOVANNI;MANCINI, MARCO;GIANOLI, PARIDE;
2012-01-01
Abstract
A method for indirect estimation of design flood in poorly gauged urbanized river basins is presented. It is based on the critical flood design criterion that maximizes peak flow for a given return period by transforming precipitation of depth duration frequency curve into runoff. In order to keep into account the variegated land cover of urbanized river basins, a spatially distributed hydrological model is employed. The paper shows that indirect method provides design discharges significantly greater respect to direct method when discharge measurements are strongly affected by upstream river overflows like in highly urbanized area. Indirect method, in addition to direct method, provides design hydrograph that is useful for those cases where design discharge only is not sufficient for designing or planning purposes.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
