IS 9108-1979

标准号：IS 9108-1979
发布日期：1980/1/1 12:00:00
实施日期：1999/12/31 12:00:00
适用范围： This standard specifies methods for measurement of water flow in open channels using rectangular and triangular-notch (V-notch) thin-plate weirs. The flow conditions considered are limited to steady, free and fully ventilated discharge of clear water. Recommended discharge coefficients are applicable to water only in the approximate range of tem-peratures from 5 to 40°C. Using the coefficients for water temperatures several degrees outside this range will result in negligible error except at very small heads. Limitations of applicability related to weir and flow geometry are specified for the recommended formulae.