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BRAZIL – EMERGENCY ACTION PLANS FOR “NEOENERGIA”

In August past the COBA Group began providing the “Emergency Action Plans and Preparation of Basic Designs Required for their Implementation” of a set of ten dams, for “Neoenergia”, the largest private company (in number of clients) of the Brazilian electricity sector.

The Emergency Action Plan (EAP), a component of the Dam Safety Plan, as determined by Brazilian Law No. 12334, of 2010 is a formal document that structures and sets out the actions and notifications that dam operators need to follow in the event of an emergency.

The ten dams included in this scope include:

Three power plants (UHE) UHE Itapebi (rockfill dam), on the Jequitinhonha River, Bahia; UHE Corumbá III (earthfill dam) on the Corumbá River, Goiás; UHE Dardanelos (concrete gravity dam) on the Aripuanã River, Mato Grosso; and Seven small power plants (PCH), namely:PCH Alto Fêmeas (concrete gravity) and PCH Sítio Grande (mixed concrete/earthfill dam), two dams in cascade on the Fêmeas River, Bahia; PCH Nova Aurora (RCC and earthfill dam)) and PCH Goiandira (RCC), two dams in cascade on the Veríssimo River, Goiás; PCH Pirapetinga (RCC) and PCH Pedra do Garrafão (RCC), two dams in cascade on the Itabapoana River, border of the State of Rio de Janeiro with Espírito Santo; and finally, PCH Correntina (concrete gravity), on the Éguas River, Bahia.

Inundation maps will be prepared within the scope of the EAP’s, for several flood formation and propagation scenarios, as well as dam-break and accidents. These inundation maps will be generating resorting to hydrodynamic modelling.

In addition to inundation maps drawn upon 1:25000 cartography, studies will include cross-sections of rivers containing data such as the time of arrival of the flood wave, the total flooded area, the height of the wave and the maximum velocity and flows reached. Hydrographs with graphic representation of the flood flows over the time elapsed since the beginning of the event will also be drawn up.

From the delimitation of flooded areas and the identification of vulnerable spots for which it will be necessary to characterize the river valleys downstream of dams, particularly in socio-economic aspects, the consultant will map self-rescuing zones (SRZ), which are regions where it is expected that there is not enough time for intervention by competent authorities. SRZ’s provide indication of the vulnerable villages, the estimated number of people and infrastructures affected, and the location of the identified shelters.

In October, the Itapebi Dam was visited with the purpose of acknowledging the infrastructure and its state of conservation.

 

 

Lx, 30 Nov 2015