The connection between time of concentration and rainfall intensity based on rainfall-runoff modeling

Négyesi, Klaudia and Nagy, Eszter Dóra (2024) The connection between time of concentration and rainfall intensity based on rainfall-runoff modeling. IDŐJÁRÁS / QUARTERLY JOURNAL OF THE HUNGARIAN METEOROLOGICAL SERVICE, 128 (4). pp. 439-450. ISSN 0324-6329

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Abstract

The study aims to examine the relation between rainfall intensities and timesof concentration based on rainfall-runoff modeling using the recently developed featuresof the Hydrologic Engeneering Center – Hydrologic Modeling System (HEC-HMS)modeling software. The time of concentration is generally considered a constantcharacteristic of a catchment. However, various publications have shown that response timeis a dynamic property and a function of rainfall intensity. Model simulations wereperformed to gain more insight into the relationship mentioned. The applicability of thedynamic time of concentration was examined with the help of a recent version of the HECHMS software that can interpret the dynamic relationship between time of concentrationand rainfall intensity. The models were built for characteristic and dynamic cases. In thecharacteristic case, the time of concentration values of the catchments were calculatedusing the commonly applied Wisnovszky empirical equation, while in the dynamic case,the applicability of the rainfall intensity, i.e., the time of concentration function, wasexamined. The applicability of the new HEC-HMS feature was reviewed, and therelationship between the time of concentration and rainfall intensity was confirmed. Thedynamic approach improved the models’ performance, especially where the Wisnovszkyequation yields an inadequate estimation of the time of concentration based on the results.

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