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Article

A New Approach to Use Load Duration Curves to Evaluate Water Quality: A Study in the Doce River Basin, Brazil

1
Department of Agricultural Engineering, Federal University of Vicosa (UFV), Viçosa-MG 36570-900, Brazil
2
Minas Gerais Water Management Institute (IGAM), Belo Horizonte-MG 30000-000, Brazil
3
Department of Water Resources, Vale do Rio Verde University (Unincor), Três Corações-MG 37417-150, Brazil
*
Author to whom correspondence should be addressed.
Water 2020, 12(3), 811; https://doi.org/10.3390/w12030811
Received: 19 February 2020 / Revised: 9 March 2020 / Accepted: 10 March 2020 / Published: 14 March 2020
(This article belongs to the Special Issue Water Security and Governance in Catchments)
Although water availability depends both on qualitative and quantitative aspects, most studies focus only on one of these. Therefore, the goal here is to relate water quality and quantity with the construction of Load Duration Curves (LDC) and to estimate E. coli load patterns in different flow conditions, seasons, and positions of two sub-basins of the Doce watershed (Brazil): Piracicaba and Piranga. A novel methodology is proposed in which the Burr XII distribution is adjusted to the LDC to compare all observed loads to their respective Total Maximum Daily Load (TMDL), allowing the estimation of the relative difference (RD) between these. Higher values of RD were observed for low flows for the Piracicaba basin, more urbanized, where point sources of pollution are the primary concern, reaching up to 99% of needed load reduction. In the Piranga basin, more agricultural, there was a broader RD variation, from 9% to 97% load reduction needed, which is an evidence of point sources of pollution combined with non-point sources. The new methodology can be used to estimate the load reduction of any pollutant and can be used by environmental agencies to identify effective practices to minimize and control pollution in different locations of the basins. View Full-Text
Keywords: water quality; water quality management; TMDL; E. coli water quality; water quality management; TMDL; E. coli
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MDPI and ACS Style

Serrano, L.d.O.; Borges, A.C.; Pruski, F.F.; Melo, M.C.d. A New Approach to Use Load Duration Curves to Evaluate Water Quality: A Study in the Doce River Basin, Brazil. Water 2020, 12, 811. https://doi.org/10.3390/w12030811

AMA Style

Serrano LdO, Borges AC, Pruski FF, Melo MCd. A New Approach to Use Load Duration Curves to Evaluate Water Quality: A Study in the Doce River Basin, Brazil. Water. 2020; 12(3):811. https://doi.org/10.3390/w12030811

Chicago/Turabian Style

Serrano, Ligia d.O., Alisson C. Borges, Fernando F. Pruski, and Marília C.d. Melo 2020. "A New Approach to Use Load Duration Curves to Evaluate Water Quality: A Study in the Doce River Basin, Brazil" Water 12, no. 3: 811. https://doi.org/10.3390/w12030811

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