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Infl uence of stormwater drain system for fecal pollution in the river Acaraú in Sobral-Ceará This study was aimed to check the infl uence of stormwater drain system for fecal pollution in the river Acaraú in Sobral-Ceará. We analyzed 24 samples of water collected in 3 stormwater drain system located on the left bank. The bacteriological analyses were concerning the determination of the Most Probable Number (MPN) of Total Coliform (TC) and Fecal (FC), isolation and identifi cation biochemistry of Escherichia coli. The change in MPN/100mL of TC FC and the gallery 1 was 3.6 x 10 to 93 x 10 and <3.0 to 43 x 10 respectively. In the gallery 2, the values of TC/100mL ranged from 23 x 10 to 23 x 10, and those of FC/100mL ranged from 6.2 x 10 to 23 x 10. Samples of the gallery 3 had MPN TC and FC ranging from 3.6 x 10 to 11 x 10 and <3.0 to 23 x 10 respectively. 20 strains were isolated, and 12 (48%) of E. coli type I, 8 (32%) of E. coli type II. The high rates of FC associated with the isolation of coliform bacteria in the stormwater drain system can only be explained by the presence of sewage connected to these drainage systems. This fact contributes to pollution of fecal origin of the river Acaraú.

Influência das Galerias Pluviais para Poluição de Origem Fecal do Rio Acaraú, no Trecho Urbano de Sobral-Ceará