Positive volume vs negative volume in Totalizing Flow Meter

 Applies To Product(s): WaterGEMS, WaterCAD, SewerCAD Version(s): CONNECT Edition, V8i Area: Modeling Original Author: Jesse Dringoli, Bentley Technical Support Group

Problem

What is the difference between positive volume and negative volume in the Totalizing Flow Meter?

Solution

Positive Volume - The amount of flow passing through the meter from the element upstream (Start Node) to the element downstream (Stop Node). For reservoirs, a positive volume represents water filling the reservoir (going to it.) For junctions, a positive volume represents volume of water leaving the junction as a demand.

Negative Volume - The amount of flow passing through the meter from the element downstream (Stop Node) to the element upstream (Start Node). For reservoirs, a negative volume represents water emptying the reservoir (going away from it.) For junctions, a negative volume represents volume of water entering the junction as a  negative demand (inflow).

Net Volume - The value reported in this field is the Negative Volume subtracted from the Positive Volume.

Total Volume - The total amount of flow passing through the meter in either direction.

See Also

Finding the total volume of water in SewerCAD and SewerGEMS

Finding total demand volume for a scenario in WaterCAD and WaterGEMS

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