The Lanfear-Coll Method uses a regression technique to fit the Manning Equation to flow monitoring data. This method can be applied to data obtained under uniform flow conditions and requires no direct knowledge of the roughness coefficient (n) or slope (S).
This method is demonstrated here and is useful when design or as-built records are not available. Note that the Lanfear-Coll Method results in a pipe curve that is constrained to the origin (0,0). Under ideal conditions, the Design Method and the Lanfear-Coll Method result in the same pipe curve.
Click Here for full-size view.
A technical paper describing the Lanfear-Coll Method in more detail is available for download.
This technical paper was presented at the American Society of Civil Engineers Pipelines 2004 Conference. This conference was held in San Diego, California on August 1-4, 2004.