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<p>Sedimentation-driven reservoir degradation and volumetric decline represent critical constraints for water supply systems in rapidly urbanising environments. This study applied GNSS-referenced Single Beam EchoSounder (SBES) bathymetry to quantify depth change, storage capacity, and sedimentation patterns in the Erelu Reservoir, southwestern Nigeria. High-resolution surveys conducted in 2022, 2023, and 2025 indicate a progressive reduction in reservoir capacity, with average depth decreasing from 2.52&#xa0;m to 2.03&#xa0;m and total volume declining from 2.30&#xa0;million m³ to 2.17&#xa0;million m³. Population projections and water-demand modelling for 2024–2030 demonstrate that the current storage can support municipal needs for only 50–56 days under moderate consumption assumptions, underscoring increasing supply vulnerability. Recommended actions include targeted dredging, removal of aquatic weeds, expansion of rainfall-harvesting systems, and increasing treated-water storage from 4,800&#xa0;m³ to approximately 600,000&#xa0;m³. By integrating geodetically controlled bathymetry with volumetric modelling, this study addresses a methodological gap and provides quantitative evidence required for long-term reservoir restoration and operational planning.</p>

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Bathymetric assessment and water management strategies for Erelu Reservoir, Oyo Town

  • 期刊论文

  • 发表日期：

    2026年3月3日

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  • Ibrahim Opeyemi Shittu,
  • Olajire Afeez Jimoh,
  • Isa Adekunle Hamid-Mosaku,
  • Olalekan Abeeb Jimoh,
  • Emmanuel Adeyemi Adeleke,
  • Anthony Efeoghene Akpovbovbo,
  • Ayodeji Abdul Aziz Daramola,
  • Yusuf Olatunji Afonja,
  • Luqman Obasekore Muhammed

摘要

Sedimentation-driven reservoir degradation and volumetric decline represent critical constraints for water supply systems in rapidly urbanising environments. This study applied GNSS-referenced Single Beam EchoSounder (SBES) bathymetry to quantify depth change, storage capacity, and sedimentation patterns in the Erelu Reservoir, southwestern Nigeria. High-resolution surveys conducted in 2022, 2023, and 2025 indicate a progressive reduction in reservoir capacity, with average depth decreasing from 2.52 m to 2.03 m and total volume declining from 2.30 million m³ to 2.17 million m³. Population projections and water-demand modelling for 2024–2030 demonstrate that the current storage can support municipal needs for only 50–56 days under moderate consumption assumptions, underscoring increasing supply vulnerability. Recommended actions include targeted dredging, removal of aquatic weeds, expansion of rainfall-harvesting systems, and increasing treated-water storage from 4,800 m³ to approximately 600,000 m³. By integrating geodetically controlled bathymetry with volumetric modelling, this study addresses a methodological gap and provides quantitative evidence required for long-term reservoir restoration and operational planning.