A state observer for the calibration of the Hazen-Williams equation

This article presents an approach based on a state observer to calibrate the Hazen-Williams (HW) equation, which is widely used to model the head loss in a pipeline. To perform the calibration process, the approach requires a record over time of the flow rate, which can be taken in any coordinate along the pipeline, and a record of the pressure taken at the inlet. Specifically, the proposed approach allows estimating both the roughness coefficient involved in the HW equation and the hydraulic head at the pipeline outlet. The closure of this contribution presents some results involving data that were collected during experiments in a physical model. Such results show the feasibility of implementing the proposed approach.