PRODUCTION CAPACITY OF THE FRACTURED AQUIFERS OF THE STATE OF SÃO PAULO: GEOLOGICAL CONTROLS
As a consequence of the dificulty in predicting the hydraulic behaviour of the fractured aquifers, due totheir descontinuity and heterogeneity, there is not, up to this moment, any generally accepted method to map this type ofmedia, in terms of both potenciality and vulnerability. In this way, in or...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Associação Brasileira de Águas Subterrâneas
2007-12-01
|
| Series: | Revista Águas Subterrâneas |
| Online Access: | https://aguassubterraneas.abas.org/asubterraneas/article/view/16168 |
| Summary: | As a consequence of the dificulty in predicting the hydraulic behaviour of the fractured aquifers, due totheir descontinuity and heterogeneity, there is not, up to this moment, any generally accepted method to map this type ofmedia, in terms of both potenciality and vulnerability. In this way, in order to meet the main goal of the HydrogeologicalMap of the State of São Paulo, namely, delimitate areas with different goundwater production potentiality, it was necessaryto develop a method which consisted on the evaluation of the specific capacity variation of selected wells with regard to:lithologic groups, thickness of the non-consolidated materials (regolith, soil and sediments), density and intersection oflineaments, and geological blocks. As a result, four classes of hydrogeological potential were characterized, three of themcorresponding to the subdivision of the non-carbonatic Precambrian rocks, whose specific capacity medians are 0,04m³/h/m, 0,08 m³/h/m (the Eocretaceous diabases are encompassed by this class) and 0,18 m³/h/m. The most productive classencompasses carbonatic Precambrian rocks and Eocretaceous basalts, with medians of 0,62 and 1,25 m³/h/m, respectively.The boundaries between regions of pre-cambrian rocks with distinct production capacity correspond mainly to importantshear zones, which partialy delimitate terrains with different geological evolutions, and secondarily to brittle discontinuities. |
|---|---|
| ISSN: | 0101-7004 2179-9784 |