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11. Water National Agency - ANA (Details Narrative) - BRL (R$) R$ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Water National Agency - Ana Details Narrative
Water National Agency – ANA	R$ 70,487	R$ 81,221

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Balance Type:	na
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- Definition

Agreements executed within the scope of the Hydrographic Basin Depollution Program (PRODES), also known as ""Treated Sewage Purchase Program"". This program does not finance works or equipment, remunerates by results achieved, i.e., by effectively treated sewage. In this program, the Water National Agency (ANA) makes available funds, which are restricted to a specific current account and applied in investment funds at the Caixa Econômica Federal - Federal Savings Banks (CEF), until the fulfillment of treated sewage volume is evidenced, as well as, the reduction of polluting cargoes of each agreement. When resources are made available, liabilities are recorded until funds are released by ANA. After the evidence of targets stipulated in each contract, the revenue deriving from these funds is recognized, but if these targets are not met, funds will return to the National Treasury with the appropriate funds earnings.

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Period Type:	instant