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abstract 947

THE INFLUENCE OF SAMPLING FREQUENCY AT THE QUANTIFICATION OF POLLUTANT LOADS IN THE DESCOBERTO RIVER – DISTRITO FEDERAL, BRAZIL

Author(s): Janaína Bezerra Mesquita1, Sérgio Koide1 & Nabil Joseph Eid1
1 Universidade de Brasília, UnB. Departamento de Engenharia Civil e Ambiental. Faculdade de Tecnologia. 70910-900. Brasília – DF. Tel.: (55) (61) 3307-2304 r-31. E-mails – janaina.mesquita@anvisa.gov.br; skoide@unb.br; njeid@unb.br . Home Page - www.unb.br/ft/enc/recursoshidricos/posrh.htm

Keyword(s): sampling frequency, pollutant

Article:

Poster:

Session: OS1m Water quality 1

AbstractRiver basin water quality monitoring systems, essential

activity for the water management, involves lots of variables to be evaluated in the sense of allocating operational and

financial resources that makes it an optimized project. Some researches, however, are developed to establish the

minimal networks for monitoring watersheds that turns viable it implementation, even in small basins.

Design

water quality network monitoring involves three major activities: selection of the water quality indicators; allocation of

the sample’s points; and the frequency of sampling activity. The first step is well known, whereas the followings have

been done based on the knowledge of the watershed and by try and error. These need to be more studied to make

it systemize.

To point out the step of choosing the frequency of the sampling activity, this paper aims to verify

the influence of some sample’s frequencies for the quantification of the pollutant loads in the Descoberto River

Watershed, Federal District - Brazil, regarding the objective of subsidizing the sample’s frequency definition in

ungaged basins.

The Descoberto River Watershed is an area of assorted land use as well as conservation

practices, with increasing development in recent years. This watershed is also the main water supply source for the

Federal District and, consequently, there is a strong interest on the impact assessment of increasing human activities

over the river water quality.

The comparison of different strategies of sampling frequency, established by the

Water and Wastewater Company and the refined frequency of this study at the Descoberto River Watershed, shows

its influence for the river pollutants quantification.

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THE INFLUENCE OF SAMPLING FREQUENCY AT THE QUANTIFICATION OF POLLUTANT LOADS IN THE DESCOBERTO RIVER – DISTRITO FEDERAL, BRAZIL