Siphon rainwater water conservancy calculation principle
  ( 1 ) The sum of the total head loss of the siphonic roof rainwater drainage pipe from the rainwater bucket to the transition section and the flow head of the transition section shall not be greater than the geometric height difference of the rainwater bucket to the transition section.
  ( 2 ) The height difference between the top surface of the rainwater bucket and the suspended pipe shall not be less than 1m . Welcome to the company's official website http://
  Elevation (3) water bucket to the top surface of the riser transition section diameter should be greater than 3m DN75 or less, the riser should be greater than the diameter not less than 5m DN90 time.
  ( 4 ) The design flow rate of the suspension pipe should not be less than 0.75m/s , and the design flow rate of the riser should not be less than 2.2m/s , and should not be greater than 10m/s .
  ( 5 ) The flow velocity downstream of the transition section of siphonic roof rainwater ( siphon rainwater ) drainage pipe system should not exceed 2.5m/s . When the flow velocity is greater than 2.5m/s, energy dissipation measures should be taken.
  ( 6 ) The allowable error of the head loss of each rainwater bucket to the transition section shall be less than 5 kPa .
  ( 7 ) The maximum negative pressure calculation value in the system shall be determined according to the altitude of the installation site, the material of the pipeline, the maximum and minimum working pressure of the pipe and fittings, etc., but shall not be lower than 90 kPa .
  ( 8 ) The resistance coefficient along the pipeline shall be calculated according to the following formula.
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