Sewergems: In the RNE OS.070 of PERU, I request a minimum flow in the starts of 1.5 l / s

Question

In the RNE OS.070 of PERU, I request a minimum flow in the starts of 1.5 l / s, meaning that the initial flow of the pipes will be at a flow rate of at least 1.5 l / s, however when I reach the first Buzon (BZ) I have the need to have two outputs and I am forced to use the "IS DIVERSION LINK", and I could indicate a flow rate of 0.75 l / s to pass through each half, however this flow would not comply with what is requested in the RNE OS.070 of PERU, in view of the fact that they require me to comply with at least 1.5 l / s. what they recommend me to do.
I appreciated your response, thank you.

Yashodhan Joshi · Answer

Hello Richard, 
 When your conduit splits into two at a manhole the flow will also split. Since your upstream conduit is carrying 1.5 L/s the flow will be divided among the two downstream conduits. The flow split may or maynot be equal (0.75 L/s per conduit) and depends entirely on the diversion rating curve you specify at the diversion link. 
 If you want minimum flow of 1.5 L/s then you would have to add flow at the manhole so that the downstream conduit also has a minimum flow of 1.5 L/s. 
 In addition to this as a tip you can use the design constraints under Analysis > Analysis Tools to define minimum and maximum velocity, slope and cover. These design constraints help you design your model as per standard practices followed. 
 If you are using SewerGEMS or SewerCAD you will find the "Design Alternative" in the Help section. You can refer it for more understanding. 
 For your reference here is the relevant article for modeling flow diversions; 
 Modeling a flow split (diversion) 
 Hope this helps.

Jesse Dringoli · Answer

As Yashodhan mentioned, you'd need to adjust loading to cause the flow to be at least 1.5 L/s, but it seems odd to me to do this to force the model to show a specific flow. 
 Could you provide more details on this requirement of a minimum of 1.5 L/s? Is this to ensure pipes are self-cleaning? If so, you could look into the Tractive Stress design constraints, though it may not result in the flow you desire. 
 You could also try modeling the flow split as an outfall with two separate manholes for the downstream systems with a load of 1.5 L/s on each, but then the backwater profile calculations (HGL) won't propagate through this.

Jesse Dringoli · Answer

Richard, are you able to communicate in English? If so, could you clarify the last part of your previous response? If you want both of the downstream pipes (going away from the diversion) to have a flow of 1.5 L/s, you would enter a fixed load of 1.5 l/s on the two manholes seen in my above screenshot. 
 En espa&ntilde;ol: 
 Richard, &iquest;puedes comunicarte en ingl&eacute;s? De ser as&iacute;, &iquest;podr&iacute;a aclarar la &uacute;ltima parte de su respuesta anterior? Si desea que las dos tuber&iacute;as aguas abajo (que se alejan de la desviaci&oacute;n) tengan un flujo de 1.5 L / s, debe ingresar una carga fija de 1.5 l / s en los dos pozos de registro que se ven en la captura de pantalla anterior.

Sewergems: In the RNE OS.070 of PERU, I request a minimum flow in the starts of 1.5 l / s

Top Replies