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Wahl, Tony L.. 2003. "Design Guidance for Coanda-Effect Screens". Bureau of Reclamation, Report Number R-03-03.

Abstract: Coanda-effect screens address the growing need for screening of small debris and aquatic organisms from water diversions. These screens have large flow capacities and are hydraulically self-cleaning without moving parts, so they require minimal maintenance. Coanda-effect screens have been commercially available for many years in a limited number of configurations. Information needed to develop custom designs has previously been limited. This report reviews laboratory testing performed during the past 10 years that has led to the development of a numerical model that computes flow profiles and hydraulic capacities of Coanda-effect screens. Computer software to perform the calculations is publicly available through the Bureau of Reclamation web site, and its use is described here. The computer model is used to develop hydraulic rating curves defining the performance of several reference screen designs that are typical of existing installations. The model is also used to examine the sensitivity of screen capacity to several individual design parameters varied over typical application ranges. Graphical design aids are produced from this analysis, and design guidance is provided for project planners and screen designers. An appendix provides an extensive list of existing screen installations with narrative accounts of operating and maintenance experience at several projects.


Web Link: http://www.usbr.gov/pmts/hydraulics_lab/pubs/R/R-2003-03.pdf

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