Aquifer systems characterization in Campos dos Goytacazes Municipality, Rio de Janeiro, Brazil

AQUIFER SYSTEMS CHARACTERIZATION IN CAMPOS DOS GOYTACAZES MUNICIPALITY, RIO DE JANEIRO, BRAZIL^*

LUCIO C. CAETANO¹AND SUELI Y. PEREIRA²

¹Departamento Nacional de Produção Mineral (DNPM), Rio de Janeiro, RJ.

²Instituto de Geociências, UNICAMP, Campinas, SP.

Presented by ANTONIO C. ROCHA-CAMPOS

We present a hydrogeological study aimed at defining some aquifer systems and their potential to supply Campos dos Goytacazes Municipality, Rio de Janeiro State, Brazil. Campos dos Goytacazes is the largest municipality of Rio de Janeiro State (4,017.7 Km²) and it is located at 21º45'15''S and 41º19'28''W. The city is 48 km from the Atlantic Ocean, and it is situated on the Campos Sedimentary Basin, close to the delta of the Paraíba do Sul river. The project comprised regional geological studies, 3D aquifer geometry evaluation, and the analysis of the sedimentary environment. These integrated studies and the hydrogeological evaluation 4 aquifer systems are as follows:

(1) Crystalline basement rocks - low potentiality and secondary porosity, with specific capacity values varying from 0.021 to 1.53 m³/h/m;

(2) Emborê Formation - composed by sandstone and shale, is a confined aquifer system with productivity values around 3.5 m³/h/m, and transmissivity of 232.16 m²/day;

(3) Barreiras Formation - composed of sand, clays and silts, is an unconfined to confined (artesian sometimes) aquifer, with productivity values from 0.27 to 10.48 m³/h/m and transmissivities between 6.27 and 2048.20 m²/day, and

(4) Quaternary Delta Aquifer System - composed of continental and marine sediments (residual soils, sand, gravel, clays and silts), with high productivity values (from 0.04 to 132.31 m³/h/m) and high transmissivities (from 245.76 to 9023.62 m²/day). These aquifer systems are a cheap and simple source to supply both urban and rural areas of Campos dos Goytacazes. The aquifer systems are presented on the Hydrogeological Map (scale 1: 200,000). — ( December 8, 2000 )

^*

Supported by FAPESP.

Publication Dates

• Publication in this collection
  05 Oct 2001
• Date of issue
  Sept 2001