Calculations
Velocity gradient to Parshall meter
Input data
Flow (Q)
Temperature
Flume width (W)
Downstream height (Yj)
Output data
Velocity gradient
Head loss
Critical yj
Detention time
Description
Given the water temperature, the Parshall flume width, the flow through it, and the tailwater height, this calculation determines the velocity gradient in the stretch downstream from the throat.
Parshall
Inputs
| Parameter | Default units | Description |
|---|---|---|
| Flow (Q) | L/s | Volumetric flow through the Parshall flume |
| Temperature | °C | Water temperature |
| Flume width (W) | in | Width of the Parshall flume throat |
| Downstream height (Yj) | m | Tailwater height at the downstream section of the Parshall flume |
Outputs
| Parameter | Default units | Description |
|---|---|---|
| Flow (Q) | m³/s | Volumetric flow through the Parshall flume |
| Velocity gradient | s⁻¹ | Velocity gradient in the downstream section |
| Head loss (hf) | m | Head loss along the analyzed section |
| Critical yj | m | Critical height of the liquid layer |
| Detention time (tdet) | s | Water detention time within the Parshall flume |
References
- VIANNA, Marcos Rocha. Produção, Reservação e Distribuição de Água. e-book. Belo Horizonte: Bloom, 2021.