International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage

Multilingual Technical Dictionary (MTD)
3712. Double orifice module outlet, or Siphon module outlet : A Neyrpic module provided with two metallic covers forming a syphon. This outlet works as a semi-module as long as upstream water level does not touch the bottom edges of the two metallic covers. Then, with further rise in upstream water level it works as a semi-module orifice till the siphon primes and flow through which impinges on the jet. This outlet gives constant or nearly constant discharge with a relatively large change in upstream water level (illustrated).

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