paper Seasonal reference flows in water resource allocation
Keywords:
Seasonality, reference flow, water permitAbstract
The Water Resources Policy in Brazil foresaw the use of the grant of water resources as a tool to guarantee the effective right of access to the user. In this context, knowledge about the minimum reference flows is important to defining the grantable limits. The minimum reference flows are usually determined in two different ways: minimum flows with a certain recurrence time - normally Q7,10, and flows of duration curves - normally Q90 or Q95. The first can be found by averaging the flows of 7 consecutive days of drought with a return period of 10 years, while the second represents the flow which exceeded 90% or 95% of the time, respectively. However, it is observed that under Brazilian regulation, flow seasonality is not considered, which may end up limiting users in the use of water resources for various purposes (irrigation, industry, public supply, etc). Therefore, there is a need for the expansion of studies and methods that consider the seasonality of water bodies. This article provides a bibliographic synthesis based on relevant studies regarding the utilization of seasonal reference flow, as well as showcasing some locations where explicit methods of considering seasonality, such as seasonal reference flows, are already being employed.
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