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Sure-Flo Screen Tests. In the last decade, increasing concern for fisheries has created interest in excluding fish from water diversions with minimal impact to fish. As a result, the Hydraulic Investigations and Laboratory Services Group at the Bureau of Reclamation (Reclamation) in Denver is currently conducting research to study the performance of cylindrical fish screens for shedding debris and to provide an effective positive barrier for fish exclusion. As a part of this program, the Sure-Flo screen manufactured by Perfection Sprinkler Company was loaned to Reclamation to evaluate the performance of their present screen design.