LIMA, C. A. G.; http://lattes.cnpq.br/1710400831989821; LIMA, Cícero Aurélio Grangeiro.
Abstract:
The Coremas-Mãe D’Água reservoirs system, with capacity of 1.4 hm3, is located in the
Piancó river basin, within the semiarid region of Paraiba state, and presents water allocation
management conflicts among its multiple users. This system is responsible to meet the demands
of several urban water supply, irrigation and fishing activities, hydropower energy generation and
flow regularization to Rio Grande de Norte state, which is the main conflict. The management
importance of this complex system is reflected by the Agencia Nacional de Água (ANA), the
Departamento Nacional de Obras Contra a Seca (DNOCS) and the two states representatives
joint action to establish the Curemas-Açu river basins Regulatory Mark to define criteria, norms
and ways to deal with its water use conflicts.
The aim of this work is to analyze the system’s water availability, including the operation
of 24 upstream reservoirs and their use in an integrated way, to provide information to help
establishing management polices to the Piancó river basin system. The system was analyzed for
the nowadays physical, operational and hydrologic behavior scenario and created ones, including
a 10 m3/s São Francisco river water diversion. Three hydrologic conceptual models were used,
being one of them specially developed to simulate the Coremas-Mãe D’Água behavior.
The regulated flow concept as a parameter to establish water uses and operating actions is
not recommended to integrated systems due its variation according to river basin upstream
interventions, reservoir operations and conceptual modeling. The total downstream irrigation
demand requirement was not met for two years planning horizon with the actual situation. The
São Francisco water diversion support would give to the Coremas-Mãe D’Água system the
capability to meet all the required irrigation demand for the two years planned time horizon.
