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Int. J. Environ. Res. Public Health 2014, 11(3), 3015-3031; doi:10.3390/ijerph110303015
Article

From Eutrophic to Mesotrophic: Modelling Watershed Management Scenarios to Change the Trophic Status of a Reservoir

* ,
,
 and
MARETEC, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049-001, Lisboa, Portugal
* Author to whom correspondence should be addressed.
Received: 11 February 2014 / Revised: 5 March 2014 / Accepted: 5 March 2014 / Published: 12 March 2014
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Abstract

Management decisions related with water quality in lakes and reservoirs require a combined land-water processes study approach. This study reports on an integrated watershed-reservoir modeling methodology: the Soil and Water Assessment Tool (SWAT) model to estimate the nutrient input loads from the watershed, used afterwards as boundary conditions to the reservoir model, CE-QUAL-W2. The integrated modeling system was applied to the Torrão reservoir and drainage basin. The objective of the study was to quantify the total maximum input load that allows the reservoir to be classified as mesotrophic. Torrão reservoir is located in the Tâmega River, one of the most important tributaries of the Douro River in Portugal. The watershed is characterized by a variety of land uses and urban areas, accounting for a total Waste Water Treatment Plants (WWTP) discharge of ~100,000 p.e. According to the criteria defined by the National Water Institute (based on the WWTP Directive), the Torrão reservoir is classified as eutrophic. Model estimates show that a 10% reduction in nutrient loads will suffice to change the state to mesotrophic, and should target primarily WWTP effluents, but also act on diffuse sources. The method applied in this study should provide a basis for water environmental management decision-making.
Keywords: watershed modelling and management; pollution load reduction; eutrophication; water environmental capacity; land use; water resources management; CE-QUAL-W2 model; SWAT model watershed modelling and management; pollution load reduction; eutrophication; water environmental capacity; land use; water resources management; CE-QUAL-W2 model; SWAT model
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Mateus, M.; Almeida, C.; Brito, D.; Neves, R. From Eutrophic to Mesotrophic: Modelling Watershed Management Scenarios to Change the Trophic Status of a Reservoir. Int. J. Environ. Res. Public Health 2014, 11, 3015-3031.

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