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Computation of water-surface profiles in open channels

Techniques of Water-Resource Investigation 03-A15

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Abstract

The standard step-backwater method of computing water-surface profiles is described in this chapter. The hydraulic principles and assumptions are reviewed, and the field data requirements are described. Certain special cases of backwater curves and certain special field conditions are discussed in detail. The technique is used to establish or extend stage-discharge ratings; to define areas which will be innundated by flood flows of a given frequency; and to compute profiles through various reaches, including multichannel flows, and past control structures such as bridges, culverts, and road embankments. A brief description of analysis of floodways and effects of encroachments is also presented.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Computation of water-surface profiles in open channels
Series title:
Techniques of Water-Resource Investigation
Series number:
03-A15
Edition:
-
Year Published:
1984
Language:
ENGLISH
Publisher:
U.S. G.P.O. ;For sale by the Distribution Branch, U.S. Geological Survey,
Description:
x, 48 p. :ill. ;26 cm. Reprinted in 1994.