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How do environmental flows allocation and storage capacity changes impact the performance of multipurpose reservoirs?

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Title: How do environmental flows allocation and storage capacity changes impact the performance of multipurpose reservoirs?
Authors: Jain, Sharad K.1 (AUTHOR) Sharad.jain@iitgn.ac.in
Source: ISH Journal of Hydraulic Engineering. Jul2026, Vol. 32 Issue 3, p601-618. 18p.
Subjects: Water storage, Instream flow, Water supply, Irrigation, Management science, Storage facilities, Streamflow
Abstract: Storage reservoirs are constructed and operated to overcome mismatch between supply of water and demands. Reservoir operation causes changes in downstream rivers. While operating a reservoir, environmental flows (Eflows) are released in the river to meet the requirements of aquatic ecosystems and mitigate impacts due to diminished flows. Numerous studies have estimated Eflows in different river basins, but trade-offs between sizing and operation of multipurpose reservoirs have not been adequately studied for seasonal rivers. This study has examined how the performance of reservoirs in seasonal basins is impacted as storage size and Eflows change. It is found that if the reservoir size is increased beyond a storage ratio (defined later) of about 0.7, additional irrigation benefits show small increase, but spills do not reduce significantly. The zone between storage ratios 0.2–0.8 is crucial in reservoir design. A framework has been presented to assess the trade-offs in reservoir sizing and operation to meet Eflows and other needs and arrive at acceptable solutions. Results show that the trade-offs depend on the relative magnitude of Eflows and other demands and on statistical properties of inflows and demands. [ABSTRACT FROM AUTHOR]
Copyright of ISH Journal of Hydraulic Engineering 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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Header DbId: egs
DbLabel: Engineering Source
An: 194898268
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: How do environmental flows allocation and storage capacity changes impact the performance of multipurpose reservoirs?
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  Data: <searchLink fieldCode="AR" term="%22Jain%2C+Sharad+K%2E%22">Jain, Sharad K.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Sharad.jain@iitgn.ac.in</i>
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  Data: <searchLink fieldCode="JN" term="%22ISH+Journal+of+Hydraulic+Engineering%22">ISH Journal of Hydraulic Engineering</searchLink>. Jul2026, Vol. 32 Issue 3, p601-618. 18p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Water+storage%22">Water storage</searchLink><br /><searchLink fieldCode="DE" term="%22Instream+flow%22">Instream flow</searchLink><br /><searchLink fieldCode="DE" term="%22Water+supply%22">Water supply</searchLink><br /><searchLink fieldCode="DE" term="%22Irrigation%22">Irrigation</searchLink><br /><searchLink fieldCode="DE" term="%22Management+science%22">Management science</searchLink><br /><searchLink fieldCode="DE" term="%22Storage+facilities%22">Storage facilities</searchLink><br /><searchLink fieldCode="DE" term="%22Streamflow%22">Streamflow</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Storage reservoirs are constructed and operated to overcome mismatch between supply of water and demands. Reservoir operation causes changes in downstream rivers. While operating a reservoir, environmental flows (Eflows) are released in the river to meet the requirements of aquatic ecosystems and mitigate impacts due to diminished flows. Numerous studies have estimated Eflows in different river basins, but trade-offs between sizing and operation of multipurpose reservoirs have not been adequately studied for seasonal rivers. This study has examined how the performance of reservoirs in seasonal basins is impacted as storage size and Eflows change. It is found that if the reservoir size is increased beyond a storage ratio (defined later) of about 0.7, additional irrigation benefits show small increase, but spills do not reduce significantly. The zone between storage ratios 0.2–0.8 is crucial in reservoir design. A framework has been presented to assess the trade-offs in reservoir sizing and operation to meet Eflows and other needs and arrive at acceptable solutions. Results show that the trade-offs depend on the relative magnitude of Eflows and other demands and on statistical properties of inflows and demands. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of ISH Journal of Hydraulic Engineering 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: 10.1080/09715010.2026.2664716
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 18
        StartPage: 601
    Subjects:
      – SubjectFull: Water storage
        Type: general
      – SubjectFull: Instream flow
        Type: general
      – SubjectFull: Water supply
        Type: general
      – SubjectFull: Irrigation
        Type: general
      – SubjectFull: Management science
        Type: general
      – SubjectFull: Storage facilities
        Type: general
      – SubjectFull: Streamflow
        Type: general
    Titles:
      – TitleFull: How do environmental flows allocation and storage capacity changes impact the performance of multipurpose reservoirs?
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            NameFull: Jain, Sharad K.
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          Dates:
            – D: 01
              M: 07
              Text: Jul2026
              Type: published
              Y: 2026
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              Value: 32
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            – TitleFull: ISH Journal of Hydraulic Engineering
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