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Water
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Changes in Hydrology and Rainfall–Runoff Processes at Watersheds
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Changes in Hydrology and Rainfall–Runoff Processes at Watersheds

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Hydrology".

Deadline for manuscript submissions: 25 October 2026 | Viewed by 648

Special Issue Editor

Dr. Grzegorz Janicki

E-Mail Website
Guest Editor
Institute of Earth and Environmental Sciences, Maria Cu-rie-Sklodowska University in Lublin, Al. Krasnicka 2CD, 20-718 Lu-blin, Poland
Interests: fluvial geomorphology; flash flood; gully and rill erosion
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Currently, many geographical regions are experiencing rapid changes in land use/land cover [LULC], which are generally the result of agricultural or urbanization pressures and sometimes their abandonment. These processes are often also influenced by documented changes in precipitation patterns and associated frequent precipitation-free periods. It is therefore pertinent to present the latest findings on the response of watershed areas to ongoing climatic and environmental changes. These areas of research are crucial not only in shaping water resources and river flow regimes but also in sustainable water management throughout basins.

Dr. Grzegorz Janicki
Guest Editor

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Keywords

  • rainfall–runoff processes
  • overland flow
  • slope hydrology
  • sheet flow
  • inter-rill and rill flow
  • episodic channel flow
  • flow regime
  • hydraulic geometry
  • watersheds
  • small catchment

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Published Papers (1 paper)

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Research

40 pages, 3172 KB  
Article
Systematic Assessment of Minimum Inter-Event Time Determination Methods and Precipitation Thresholds for Constructing Design-Critical Huff Hyetographs
by Marin Grubišić, Željko Šreng, Jadran Berbić and Tamara Brleković
Water 2026, 18(8), 976; https://doi.org/10.3390/w18080976 - 20 Apr 2026
Viewed by 300
Abstract
The primary processing of high-resolution precipitation records (5 min and shorter) is crucial for constructing dimensionless design hyetographs and identifying design-critical precipitation scenarios for urban drainage systems. A key step in this process is separating continuous precipitation records into individual precipitation events, typically [...] Read more.
The primary processing of high-resolution precipitation records (5 min and shorter) is crucial for constructing dimensionless design hyetographs and identifying design-critical precipitation scenarios for urban drainage systems. A key step in this process is separating continuous precipitation records into individual precipitation events, typically based on minimum inter-event time (MIT) and precipitation amount thresholds. This separation directly influences the subsequent analysis steps and the accuracy of the design hyetographs. Building upon this foundation, this study systematically analyses how different MIT determination methods influence the construction of dimensionless Huff hyetographs in a moderately humid continental climate. Three approaches for defining MIT were examined: a fixed MIT method (1–12 h), an autocorrelation-based method (AC), and a kernel density estimation approach (KDE). The analysis also considers the effects of minimum precipitation thresholds (P = 1, 3, and 5 mm) and precipitation duration classes (all durations and short-duration events with T≤2 h), utilising a continuous 10-year series of 5 min precipitation data. The results demonstrate that the choice of MIT substantially affects the identified precipitation events, duration, total amount, and the median Huff curve’s shape, especially for precipitation types with early and late maximum intensity. Specifically, increasing MIT values produces longer and deeper events with steeper Huff curves, while precipitation thresholds mainly filter weaker events rather than impacting peak intensities. The AC method yields results similar to larger fixed MIT values (≈6–9 h), whereas the KDE method corresponds to shorter separations (≈1–3 h). To unify the assessment of design relevance, a composite design index combining Huff curve slope and short-term peak intensities was introduced. Analysis shows that short-duration convective precipitation with an early maximum is the most critical design scenario. However, late-maximum events (events in which peak intensity occurs in the fourth quartile of storm duration, Type 4) can become equally critical when longer MIT values or autocorrelation-based separation are applied. These findings underscore the importance of a transparent and methodologically consistent definition of precipitation event separation criteria when using dimensionless hyetographs in urban drainage design. Full article
(This article belongs to the Special Issue Changes in Hydrology and Rainfall–Runoff Processes at Watersheds)
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