In a gravity drain the wetted area changes with depth. A full-bore assumption does not hold. Survey the channel shape, gradients, sediment and backwater before selecting a level/velocity arrangement or a hydraulic measuring structure.
What drives the selection
Changing wetted area, backwater, sediment and channel geometry
Candidate technologies
Area–velocity, flume/weir with level measurement, specialist partly filled pipe meter. Each is a starting point requiring exact-model validation.
Minimum, normal, continuous maximum and peak flow, including duration
Changing wetted area, backwater, sediment and channel geometry
Connection, orientation, pressure, temperature and available straight pipe
Power, data/reporting requirements, delivery pin code and quantity
What would rule a candidate out?
Check fluid incompatibility, an unsupported flow band, excessive pressure loss, unsuitable filling/orientation, missing power and an unproven approval or data interface. Resolve these before selecting by price.
Documented families to investigate
These are discovery links, not confirmed matches to your installation. Their unresolved specifications remain visible.
Ready to discuss your requirement?
Send a model code, BOQ or a brief description of your application. Add technical details if you have them.
