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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/hess-2018-529
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-2018-529
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 29 Oct 2018

Research article | 29 Oct 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Hydrology and Earth System Sciences (HESS).

Estimation of water yield in the hydrographic basins of southern Ecuador

Saula Minga-León1, Miguel Angel Gómez-Albores1, Khalidou M. Bâ1, Luis Balcázar1, Luis Ricardo Manzano-Solís2, Angela P. Cuervo-Robayo3,4, and Carlos Alberto Mastachi-Loza1 Saula Minga-León et al.
  • 1Instituto Interamericano de Tecnología y Ciencias del Agua, Universidad Autónoma del Estado de México, Toluca 50200, México
  • 2Facultad de Geografía, Universidad Autónoma del Estado de México, Toluca 50110, México
  • 3Comisión Nacional para el Conocimiento y Uso de la Biodiversidad (Conabio), Ciudad de México 14010, México
  • 4Departamento de Zoología, Instituto de Biología, Universidad Nacional Autónoma de México, Ciudad de México 04510, México

Abstract. Humans greatly benefit from natural water resources, also known as hydrological ecosystem services. However, these services may be reduced by population growth, land use changes, and climate change. As these problems become more critical, the need to quantify water resources increases. The estimation of water yield and its distribution are of great importance for the management of water resources. In the present study, the average annual water yield of the hydrographic basins in the southern region of Ecuador was estimated for the 1970–2015 period using the InVEST water yield model based on the Budyko framework. The model estimates annual surface run-off at the pixel, sub-basin, and basin level considering the following variables: precipitation, actual evapotranspiration, land cover/use, soil depth, and available water content for plants. The model was calibrated by varying the ecohydrological parameter Z to reduce error between estimated and observed water yield. The results showed that the modeling of water yield in the majority of the hydrographic basins was satisfactory, allowing the basins to be ranked according to their importance for water production. The Mayo and Zamora basins had the highest water production, corresponding with 934 and 1218mm per year, respectively, while the Alamor and Catamayo basins had the lowest water production, corresponding with 206 and 291mm per year, respectively. The present study provides an initial estimate of water yield at the basin level in the southern region of Ecuador, and the results can be used to evaluate the impacts of land cover changes and climate change over time.

Saula Minga-León et al.
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Short summary
Our manuscript was developed using the InVEST Water Yield model, one tool for the valuation of ecosystem services. The importance lies on the need of long time protect of the water resources and the ecosystem conservation. Particularly the results provide an initial estimate of water yield at the basin level in the southern region of Ecuador. These results could be used on the priorization of the conservation areas to evaluate the impacts of land cover changes and climate change over time.
Our manuscript was developed using the InVEST Water Yield model, one tool for the valuation of...
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