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Simplified approach to considering watershed heterogeneity in direct runoff estimation using SCS-CN model.

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Title: Simplified approach to considering watershed heterogeneity in direct runoff estimation using SCS-CN model.
Authors: Palli-Gravani, Stergia1 (AUTHOR) palligravani@aua.gr, Soulis, Konstantinos1 (AUTHOR), Wałęga, Andrzej2 (AUTHOR)
Source: Hydrological Sciences Journal/Journal des Sciences Hydrologiques. May2026, Vol. 71 Issue 6, p1259-1266. 8p.
Subjects: Runoff models, Spatial arrangement, Water management, Watershed ecology, Runoff analysis, Measurement of runoff
Abstract: This study investigates the effect of impervious surfaces on direct runoff estimation with SCS-CN method and introduces a simplified approach to represent watershed heterogeneity in the estimation of its parameters. Unlike existing approaches relying on complex parameterizations, the proposed method incorporates the spatial distribution of impervious surfaces in a simple and physically meaningful way when estimating curve number (CN) values from rainfall-runoff measurements at the basin outlet. The method was evaluated across multiple experimental watersheds and synthetic datasets and demonstrated performance comparable to more complex approaches, achieving R2 values of 0.868 – 0.992, closely matching the two-CN method (0.877 – 0.993). Although slightly less accurate, it requires fewer parameters and offers a practical, computationally efficient alternative for water management applications. Comparable performance to spatially distributed CN estimates further confirms its robustness without additional methodological complexity. The results highlight the importance of impervious surface distribution in improving CN estimation, especially in permeable watersheds. [ABSTRACT FROM AUTHOR]
Copyright of Hydrological Sciences Journal/Journal des Sciences Hydrologiques is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 193623065
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
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  Data: Simplified approach to considering watershed heterogeneity in direct runoff estimation using SCS-CN model.
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  Data: <searchLink fieldCode="AR" term="%22Palli-Gravani%2C+Stergia%22">Palli-Gravani, Stergia</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> palligravani@aua.gr</i><br /><searchLink fieldCode="AR" term="%22Soulis%2C+Konstantinos%22">Soulis, Konstantinos</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wałęga%2C+Andrzej%22">Wałęga, Andrzej</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Hydrological+Sciences+Journal%2FJournal+des+Sciences+Hydrologiques%22">Hydrological Sciences Journal/Journal des Sciences Hydrologiques</searchLink>. May2026, Vol. 71 Issue 6, p1259-1266. 8p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Runoff+models%22">Runoff models</searchLink><br /><searchLink fieldCode="DE" term="%22Spatial+arrangement%22">Spatial arrangement</searchLink><br /><searchLink fieldCode="DE" term="%22Water+management%22">Water management</searchLink><br /><searchLink fieldCode="DE" term="%22Watershed+ecology%22">Watershed ecology</searchLink><br /><searchLink fieldCode="DE" term="%22Runoff+analysis%22">Runoff analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Measurement+of+runoff%22">Measurement of runoff</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This study investigates the effect of impervious surfaces on direct runoff estimation with SCS-CN method and introduces a simplified approach to represent watershed heterogeneity in the estimation of its parameters. Unlike existing approaches relying on complex parameterizations, the proposed method incorporates the spatial distribution of impervious surfaces in a simple and physically meaningful way when estimating curve number (CN) values from rainfall-runoff measurements at the basin outlet. The method was evaluated across multiple experimental watersheds and synthetic datasets and demonstrated performance comparable to more complex approaches, achieving R2 values of 0.868 – 0.992, closely matching the two-CN method (0.877 – 0.993). Although slightly less accurate, it requires fewer parameters and offers a practical, computationally efficient alternative for water management applications. Comparable performance to spatially distributed CN estimates further confirms its robustness without additional methodological complexity. The results highlight the importance of impervious surface distribution in improving CN estimation, especially in permeable watersheds. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Hydrological Sciences Journal/Journal des Sciences Hydrologiques is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1080/02626667.2026.2628736
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 8
        StartPage: 1259
    Subjects:
      – SubjectFull: Runoff models
        Type: general
      – SubjectFull: Spatial arrangement
        Type: general
      – SubjectFull: Water management
        Type: general
      – SubjectFull: Watershed ecology
        Type: general
      – SubjectFull: Runoff analysis
        Type: general
      – SubjectFull: Measurement of runoff
        Type: general
    Titles:
      – TitleFull: Simplified approach to considering watershed heterogeneity in direct runoff estimation using SCS-CN model.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Palli-Gravani, Stergia
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            NameFull: Soulis, Konstantinos
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          Name:
            NameFull: Wałęga, Andrzej
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          Dates:
            – D: 01
              M: 05
              Text: May2026
              Type: published
              Y: 2026
          Identifiers:
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              Value: 02626667
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              Value: 71
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              Value: 6
          Titles:
            – TitleFull: Hydrological Sciences Journal/Journal des Sciences Hydrologiques
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