NIST ASSISTS THE U.S. BUREAU OF RECLAMATION.NIST (National Institute of Standards & Technology, Washington, DC, www.nist.gov) The standards-defining agency of the U.S. government, formerly the National Bureau of Standards. It is one of three agencies that fall under the Technology Administration (www.technology. measurements of fish screens for the U.S. Bureau of Reclamation (USBR USBR United States Bureau of Reclamation ) Water Resources Research Laboratory were instrumental in a recent study of the hydraulic performance of self-cleaning, Coanda-effect screens. These screens are used on irrigation irrigation, in agriculture, artificial watering of the land. Although used chiefly in regions with annual rainfall of less than 20 in. (51 cm), it is also used in wetter areas to grow certain crops, e.g., rice. and small hydropower hy·dro·pow·er n. Hydroelectric power. projects to separate debris and fish from diverted water. Coanda-effect screens employ unique tilted-wire geometry. The tilt angle is instrumental in determining the hydraulic performance of the screen. NIST measured the tilt angle with an optical projector to verify the USBR procedures for tilt-angle measurement. Results of the USBR study validated their theoretical model of the hydraulic performance of the screens. The model will be used to predict the capacity of Coanda effect screens and hence to choose appropriate screen sizes to achieve desired flow conditions. |
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