Abstract
ABSTRACT The objective of this study was to evaluate water seasonality in the process of granting permits and the impact of irrigation in the Dourados River basin. For that, the hydrological behavior of the basin was analyzed. The minimal streamflows (Q7,10 and Q95), irrigation withdrawal flow (Qr) and the percent variation of the grant flows relative to monthly seasonal period in relation to the monthly withdrawal flow were obtained. The results allowed to verify that using criteria based on the monthly streamflow allows for better management of water use, because it allows for greater utilization of this resource in times with high water availability and imposes a realistic restriction during critical periods. The average annual water withdrawal for irrigation in the basin during the studied period was on the order of 2.99 m3 s-1, and the withdrawal flow in the month of highest demand (August) was 5.95 m3 s-1.
Highlights
The last decades have been characterized by a substantial increase in the water demand for various purposes
The natural water availability in a water basin is represented by the average and minimum streamflows, and knowing them is of great importance for an adequate planning of usage and shared management of the water resources (Novaes et al, 2009)
The minimum reference flows estimated were the minimum flows of seven days of duration and return period of 10 years (Q7,10) and the minimum flow associated with 95% of permanence in time (Q95)
Summary
The last decades have been characterized by a substantial increase in the water demand for various purposes. The natural water availability in a water basin is represented by the average and minimum streamflows, and knowing them is of great importance for an adequate planning of usage and shared management of the water resources (Novaes et al, 2009). The minimum reference flows estimated were the minimum flows of seven days of duration and return period of 10 years (Q7,10) and the minimum flow associated with 95% of permanence in time (Q95). These criteria are widely used by the National Water Agency of Brazil (ANA)
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