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Impact of Dense Networks of Reservoirs on Streamflows at Dryland Catchments

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  • Udinart Prata Rabelo

    (Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Campus do Pici, Fortaleza 60400-900, CE, Brazil)

  • Alexandre C. Costa

    (Institute of Engineering and Sustainable Development, University of International Integration of the Afro-Brazilian Lusophony, Campus das Auroras, Redenção 62790-970, CE, Brazil)

  • Jörg Dietrich

    (Institute of Hydrology and Water Resources Management, Leibniz Universität Hannover, Appelstr. 9A, 30419 Hannover, Germany)

  • Elahe Fallah-Mehdipour

    (Institute of Hydrology and Water Resources Management, Leibniz Universität Hannover, Appelstr. 9A, 30419 Hannover, Germany)

  • Pieter Van Oel

    (Water Resources Management Group, Wageningen University & Research, 6708 PB Wageningen, The Netherlands)

  • Iran Eduardo Lima Neto

    (Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Campus do Pici, Fortaleza 60400-900, CE, Brazil)

Abstract

Small reservoirs play an important role in providing water to rural communities. Increased construction of small reservoirs to mitigate the effects of droughts leads to a High-density Reservoirs Network (HdRN) of small reservoirs, which can potentially modify the streamflows both in dry and wet periods. However, there is a lack of understanding of the interannual behavior of flow retention and the impact of future increases in the number of small reservoirs, mainly for HdRN in dryland catchments. This research aims to determine the possible impact of the increase in the number of small reservoirs on dry hydrological networks, evaluating the annual flows generated at the outlet of a dryland watershed for scenarios with different densities of small reservoirs (number of reservoirs per area). The study area was the Conceição river catchment (3347 km 2 ) in the semiarid of Brazil. The hydrological model of the study area was developed in SWAT. The model obtained appropriate results for daily streamflows, with values of 0.63, 0.81, and 0.53% for NSE, KGE, and PBIAS, respectively. The current density of small reservoirs in the region was estimated at 0.068 reservoirs per square kilometer (res/km 2 ). Eight expansion scenarios were defined for densities between 0.1 res/km 2 and 3.0 res/km 2 . The results showed that the influence of the HdRN on runoff reduction mostly occurs for a probability of exceedance between 1% and 10% of month flows and is very small for months with very high peaks of flow. The reduction in the outlet flow due to the increase in the number of small reservoirs was stronger during dry years (up to 30%) than during wet years (up to 8%), and it tended to increase in years with a consecutive lack of rain (from about 7% in the first year to about 20% in the last year and in the worst scenario), which may intensify the period of extended droughts. This research provides insights about the impact of the increase in the number of small reservoirs on the interannual variability of flow retention, and the understanding of the influence of small reservoirs on runoff reduction may help water resources agencies better prepare for hydrologic extremes (droughts and floods).

Suggested Citation

  • Udinart Prata Rabelo & Alexandre C. Costa & Jörg Dietrich & Elahe Fallah-Mehdipour & Pieter Van Oel & Iran Eduardo Lima Neto, 2022. "Impact of Dense Networks of Reservoirs on Streamflows at Dryland Catchments," Sustainability, MDPI, vol. 14(21), pages 1-17, October.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:21:p:14117-:d:957113
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    References listed on IDEAS

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    1. Althoff, Daniel & Rodrigues, Lineu Neiva & da Silva, Demetrius David & Bazame, Helizani Couto, 2019. "Improving methods for estimating small reservoir evaporation in the Brazilian Savanna," Agricultural Water Management, Elsevier, vol. 216(C), pages 105-112.
    2. Ralph Lasage & Jeroen Aerts & Peter Verburg & Alemu Sileshi, 2015. "The role of small scale sand dams in securing water supply under climate change in Ethiopia," Mitigation and Adaptation Strategies for Global Change, Springer, vol. 20(2), pages 317-339, February.
    3. Matthew Deitch & Adina Merenlender & Shane Feirer, 2013. "Cumulative Effects of Small Reservoirs on Streamflow in Northern Coastal California Catchments," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 27(15), pages 5101-5118, December.
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