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Jacob Davidian

Publications and source records attributed to Jacob Davidian.

5 recordsLinked to original sources
USGS1984

Computation of water-surface profiles in open channels

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.

Techniques of Water-Resources Investigations↗
USGS1968

General procedure for gaging streams

This chapter briefly describes the objectives and procedures used in obtaining streamflow records. It is considered an introduction to other chapters on surface-water techniques which treat individual procedures in greater detail.

Techniques of Water-Resources Investigations↗
USGS1962

Flow through openings in width constrictions

A highway embankment across a stream channel may have one or several bridge openings. In 1953, the pattern of flow through a single opening was quantitatively described by C. E. Kindsvater, R. W. Carter, and H. J. Tracy. The present investigation of the flow pattern at constrictions with two to seven openings is a continuation of the earlier study. Laboratory experiments and the analysis were directed toward the development of methods for (a) computing discharge through multiple-opening constrictions, (b) apportioning a given total discharge among the several openings, and (c) predicting the backwater caused by the constriction. The division of flow among the openings was related to the relative area of each opening, and the relative velocity in the channel immediately upstream from each opening. On the basis of this relationship, the boundaries of the flow channel approaching each opening were established. The head-discharge and backwater characteristics of each opening were then analyzed separately. It is shown that the relations developed for the constriction with a single opening are applicable to each opening of a multiple-opening constriction once the boundaries of the separate flow channels have been established.

Water Supply Paper↗