The Role of Small Reservoirs in a Water Scarcity Scenario: a Computational Approach

Silvia Di Francesco (), Stefano Casadei, Ilaria Di Mella and Francesca Giannone ()
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Silvia Di Francesco: Niccolò Cusano University
Stefano Casadei: University of Perugia
Ilaria Di Mella: Niccolò Cusano University
Francesca Giannone: Niccolò Cusano University

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2022, vol. 36, issue 3, No 7, 875-889

Abstract: Abstract This paper presents the evaluation and management of water resources at the basin scale, focusing on small reservoirs. Due to a lack of knowledge on these untapped resources, a semiautomatic procedure for their surface area estimation is presented. Multispectral images from the Pleiades satellite were used to extract water bodies from a combination of different bands. In particular, the normalized difference water index (NDWI) was used to evaluate the presence or absence of water. This methodology was applied in a test area located in the upper Tiber River Basin. The performance for identifying and analysing small reservoirs was determined by comparing the satellite information with a reference database. The potential volume available from the investigated small reservoirs was compared with the water deficit derived from a decision support simulation model at the basin/subbasin scale, which studies water allocation for multipurpose uses. Five irrigation districts were analysed. For three of these districts, more than 60% of the annual deficit can be balanced with the volume stored in small reservoirs. To date, water scarcity conditions have been increasingly frequent, so resilience in water resource management is a key requirement. Therefore, it is essential to evaluate the recovery and reuse of small reservoirs to strongly support water use, particularly irrigation and environmental uses.

Keywords: Water allocation model; SimBaT; Pleiades; NDWI (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1007/s11269-021-03052-6

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