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Bias in regression estimates of manning's n

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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.

Additional Publication Details

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