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SILVA, Joecila/B-1478-2014 FINEP; ANA; CNPq-IRD The authors are grateful for: the financial and operational support from the Brazilian agencies FINEP and ANA ("Projeto de Integracao e Cooperacao Amazonica para a Modernizacao do Monitoramento Hidrologico" ICA-MMH) and CNPq-IRD ("Assimilacao de Dados de monitoramento Espacial para a analise do regime hidrologico da Bacia Amazonica e a previsao de curto e medio prazos"); the ENVISAT satellite altimetry data supplied by ESA; the TRMM data supplied by NASA and associated agencies; the TRMM Merge data provided by CPTEC/INPE; the discharge and stage data provided by ANA, Hybam, SENHAMI-Peru and SENHAMI-Bolivia; the EnKF Fortran codes provided by Geir Evensen; the support from Fernando Fan in processing precipitation data; as well as for the constructive comments from Adalberto Meller and Jeffrey Neal, and also from Ross Woods (editor from HESS) and two anonymous reviewers. 0 COPERNICUS GESELLSCHAFT MBH GOTTINGEN HYDROL EARTH SYST SC