Bias in regression estimates of manning's n
By: Kenneth L. Wahl
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Abstract
Selected equations for estimating roughness for gravel-bed streams were tested using a composite data set containing much of the data used to define the equations. All equations tested were found to significantly underestimate n for relatively low discharges. For floods about equal to the median annual peak discharge, Jarrett's equation overestimates n (median error = 10 percent) while the other equations tested showed no bias. Extrapolation of any of these equations to discharges greater than about 1.5 times the median annual peak discharge is presently unwarranted. The roughness of mountain streams is known to generally decrease as discharge and flow depth increases. The data, however, are presently not available to test the applicability of the equations to large flood discharges.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Bias in regression estimates of manning's n |
| ISBN | 0784400377 |
| Issue | pt 2 |
| Year Published | 1994 |
| Language | English |
| Publisher | Publ by ASCE |
| Publisher location | New York, NY, United States |
| Larger Work Title | Proceedings - National Conference on Hydraulic Engineering |
| First page | 727 |
| Last page | 731 |
| Conference Title | Proceedings of the 1994 ASCE National Conference on Hydraulic Engineering |
| Conference Location | Buffalo, NY, USA |
| Conference Date | 1 August 1994 through 5 August 1994 |
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