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Análise da vazão máxima outorgável e da introdução simplificada da qualidade da água no processo de outorga da bacia do rio Gramame (PB)
| Content Provider | Semantic Scholar |
|---|---|
| Author | Câmara, Ana |
| Copyright Year | 2003 |
| Abstract | The water resources situation in the Gramame River Basin (Paraiba State) has become unsustainable in recent years. The quantitative and qualitative shortage of water has caused frequent conflicts among the main users (urban supply, industry and irrigation). Therefore, there is a clear need of a water rights concession system for the efficient allocation of available water resources. This study deals with the main problems to implement such a system: (i) the maximum flow for water rights concession; and (ii) water quality issue, in water rights concession. Regarding the first problem, the following water rights criteria were established and appraised to use in the basin: (a) surplus flow; (b) reliable supply; (c) reference flow with 90% probability (Q90); (d) 2 reference flows Q90 for the dry and rainy seasons; and (e) 12 reference flows Q90 for each month. The water quality issue in the water rights concession process was introduced by estimating the flow needed to dilute BOD (Biochemical Demand of Oxygen) to the maximum concentration level, stated by the water classification in each river reach. Furthermore, the BOD depuration process was approached in a simplified manner, through depuration coefficients, seeking to evaluate the relevance of the flows released for new uses. Using the comparison of performance parameters (volumetric reliability, temporal reliability, critical temporal reliability, minimum monthly volumetric reliability, resilience and vulnerability), obtained from the simulation of each short term scenario for the basin, the water rights concession criteria, considering quantity or quality, were evaluated. Considering the impact of supplying of the existing urban water demands in the basin, the criteria for water rights concession could be ranked, from the best to the worst alternative, as: a) surplus flow, b) 12 reference flows Q90 for each month, c) 2 reference flows Q90 for the dry and rainy seasons, d) reference flow with 90% probability (Q90) and e) reliable supply. It was observed that the water rights concession to dilute BOD, in general, did not decrease significantly the water supply for existing demands in the basin; flows released by depuration of BOD were also not significant to improve the supply of river reaches affected by this process. However, except for the demand to dilute domestic effluents in the Conde District, the study showed to be impossible to dilute the current effluent discharges in the basin, whose percentage of success did not attain 50% of the time. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://lume.ufrgs.br/bitstream/handle/10183/1770/000357250.pdf;jsessionid=C7B369A403D18610BAC4216C376C7A06?sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
