Estimation of Peak Discharges under Different Rainfall Depth–Duration–Frequency Formulations

One of the main signatures of short duration storms is given by Depth–Duration–Frequency (DDF) curves. In order to provide reliable estimates for small river basins or urban catchments, generally characterized by short concentration times, in this study the performances of different DDF curves propo...

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Bibliographic Details
Published in:Hydrology 2021-12, Vol.8 (4), p.150
Main Authors: Gioia, Andrea, Lioi, Beatrice, Totaro, Vincenzo, Molfetta, Matteo Gianluca, Apollonio, Ciro, Bisantino, Tiziana, Iacobellis, Vito
Format: Article
Language:English
Subjects:
Annual rainfall
Case studies
Catchment area
Catchments
Datasets
DDF curves
Depth
Design
Discharge
Duration
Flood peak
Hydrology
Monitoring systems
Parameters
peak discharge
Rain
Rainfall
rainfall time series
River basins
SCS-CN method
Soil conservation
Storms
Time series
Urban areas
Urban catchments
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Summary:One of the main signatures of short duration storms is given by Depth–Duration–Frequency (DDF) curves. In order to provide reliable estimates for small river basins or urban catchments, generally characterized by short concentration times, in this study the performances of different DDF curves proposed in literature are described and compared, in order to provide insights on the selection of the best approach in design practice, with particular reference to short durations. With this aim, 28 monitoring stations with time series of annual maximum rainfall depth characterized by sample size greater than 20 were selected in the Northern part of the Puglia region (South-Eastern Italy). In order to test the effect of the investigated DDF curves in reproducing the design peak discharge corresponding to an observed expected rainfall event, the Soil Conservation (SCS) curve number (CN) approach is exploited, generating peak discharges according to different selected combinations of the main parameters that control the critical rainfall duration. Results confirm the good reliability of the DDF curves with three parameters to adapt on short events both in terms of rainfall depth and in terms of peak discharge and, in particular, for durations up to 30 min, the three-parameter DDF curves always perform better than the two-parameter DDF.
ISSN:2306-5338
2306-5338
DOI:10.3390/hydrology8040150