Estudo da dinâmica hídrica de um reservatório afetado pela construção de um segundo reservatório a montante

Abstract

The construction of reservoirs in sequence in the same basin has produced great problems in rural environment. It is supposed that reservoirs constructed in downstream of a second reservoir have their discharge affluent altered, or reduced, what generates conflict among proprietaries, since the proprietary of a reservoir in a downstream, will always be supposedly the harm one. The present paper has as objective to determine if, in fact, there are reductions and what the intensity of this reduction in the discharge affluent of a reservoir is (denominate here R1), that suffers influence of a second reservoir (R3), constructed in upstream. To come up to the methodology simulations were done through the use of the methodology of the water balance in reservoirs. The results show that, when the water is not taken off from R3 to irrigation, this do not influence practically anything in the water balance and the storage of R1. When the water is taken off from R3 to irrigation, this influences the storage volume in R1, but not up to the point of lacking water to irrigation of the proposed areas to the two reservoirs. When considered the dynamic capacity to determine the irrigation areas of R1 and R3, the greater total irrigation area was obtained in the simulation that considered the existence of two reservoirs, being the irrigation areas of these, determined from our dynamic capacities. In this case, the result of irrigation areas was 290 ha, more 90 ha than when only considered the static capacities in the estimation of the irrigation areas.