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Open AccessArticle

Evaluation of Design Storms and Critical Rainfall Durations for Flood Prediction in Partially Urbanized Catchments

by 1,2,* and 1
1
University of Rijeka, Faculty of Civil Engineering, 51000 Rijeka, Croatia
2
University of Rijeka, Center for Artificial Intelligence and Cybersecurity, 51000 Rijeka, Croatia
*
Author to whom correspondence should be addressed.
Water 2020, 12(7), 2044; https://doi.org/10.3390/w12072044
Received: 19 June 2020 / Revised: 14 July 2020 / Accepted: 16 July 2020 / Published: 18 July 2020
(This article belongs to the Special Issue Urban Rainwater and Flood Management)
This study investigates and compares several design storms for flood estimation in partially urbanized catchments. Six different design storms were considered: Euler II, alternating block method, average variability method, Huff’s curves, and uniform rainfall. Additionally, two extreme historical storms were included for comparison. A small, ungauged, partially urbanized catchment in Novigrad (Croatia) was chosen as a study area to account for the infiltration impact on the rainfall-runoff process. The performance of each design storm was assessed based on the flood modeling results, namely the water depth, water velocity, flow rate, and overall flood extent. Furthermore, several rainfall durations were considered to identify a critical scenario. The excess rainfall was computed using the Soil Conservation Service’s Curve Number method, and two-dimensional flooding simulations were performed by the HEC-RAS model. The results confirmed that the choice of the design storm and the rainfall duration has a significant impact on the flood modeling results. Overall, design storms constructed only from IDF curves overestimated flooding in comparison to historical events, whereas design storms derived from the analysis of observed temporal patterns matched or slightly underestimated the flooding results. Of the six considered design storms, the average variability method showed the closest agreement with historical storms. View Full-Text
Keywords: design storms; temporal pattern; rainfall duration; hydraulic modeling; urban flooding; urbanized catchments design storms; temporal pattern; rainfall duration; hydraulic modeling; urban flooding; urbanized catchments
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MDPI and ACS Style

Krvavica, N.; Rubinić, J. Evaluation of Design Storms and Critical Rainfall Durations for Flood Prediction in Partially Urbanized Catchments. Water 2020, 12, 2044. https://doi.org/10.3390/w12072044

AMA Style

Krvavica N, Rubinić J. Evaluation of Design Storms and Critical Rainfall Durations for Flood Prediction in Partially Urbanized Catchments. Water. 2020; 12(7):2044. https://doi.org/10.3390/w12072044

Chicago/Turabian Style

Krvavica, Nino; Rubinić, Josip. 2020. "Evaluation of Design Storms and Critical Rainfall Durations for Flood Prediction in Partially Urbanized Catchments" Water 12, no. 7: 2044. https://doi.org/10.3390/w12072044

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