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Historical Trends in Flood Discharges on the Upper Mississippi River
Long-term streamgage records in the Upper Mississippi River Basin were analyzed using a Kendall Tau-b analysis to determine trends in flooding and average flows. Over the 130 years of...

The Miller City Levee Break and Incipient Meander Cutoff
On July 15, 1993, the flooding Mississippi River broke through a levee near Miller City, Ill., at the head of the Mississippi Embayment, approximately 55 km upstream from Cairo, Ill. Flow...

The Summer of 1993 Floods Lower Missouri River
Throughout the State of Missouri from November 1992 through July 1993, precipitation set new records, in some cases ranging as high as 200 - 400 percent of normal rain fall. Missouri precipitation...

Problems with Indirect Determinations of Peak Streamflows in Steep, Desert Stream Channels
Many peak streamflow values used in flood analyses for desert areas are derived using the Manning equation. Data used in the equation are collected after the flow has subsided, and peak...

Analysis of the Causes and Triggering Events of Disastrous Torrent Flood
A disastrous torrent flood on the Vlasina River of 26 June 1988 was of unprecedented intensity in Yugoslavia. The catchment area affected by the catastrophe covered more than 1000 km²...

Factors Affecting Accuracy of Slope-Area Discharge Determination of the September 1992 Flood in Raven Fork, Western North Carolina
For the flood of September 10, 1992, in Raven Fork, Swain County, North Carolina, a peak discharge of 460 cubic meters per second was computed by using the slope-area method. Accuracy...

Analysis of the Torrent Lava Flow Movement and Its Computations - One Example Applied Investigation of Disastrous Torrent Flood
To compute torrent lava flow is hardly an easy task. Most often it has to be determined on the basis of flood traces. In the case of phenomenon discussed, it was the only possible way...

Roughness Coefficient in Mountain Rivers
River discharge estimations require an evaluation of the river flow resistance that generally is related with Manning's roughness coefficient. The literature suggests different ways of...

Steep Constructed Stream Channels and Chutes
Research and technology transfer needs are described for steep stream channels and chutes. Iterative processes are presented for design and construction of bouldery channels and chutes...

Chezy Formula Versus Theory and Common Sense
Using the theoretical concepts of the uniform flow formula and the inverse solution of the Chezy equation it is shown that a channel shape may have considerable influence on the value...

A New Formula for Mean Velocity in Torrents
In this paper we present a new equation for mean velocity in torrents based on travel time measurements and geomorphological relations. Here, the emphasis is not on understanding the physical...

Design of Manning's-Rougness-Coefficient Study in New York State
Field-collected hydraulic data can be used to compute roughness coefficients for channels with different hydraulic characteristics. Suggested criteria for the design of a roughness-coefficient...

At-A-Site Mountain River Flow Resistance Variation
At-a-site variation in flow resistance is examined in the light of observations of an S-shaped velocity profile at relative submergences (d/D₈₄)...

An Analysis of Flow Velocity Profiles, Stream Bed Roughness, and Resistance to Flow in Natural Gravel Bed Streams
The characteristics of 82 flow velocity profiles were analyzed from nine different gravel bed stream reaches. A statistical test of the linearity of flow velocity profiles indicates that...

A new approach for the estimation of extreme roughness in torrents by Hydraulic and Photogrammetry
In this paper we present an approach to estimate extreme roughness in torrents based on the transformation of an irregular bed geometry of a torrent reach into a geometrically well determined...

Study of Friction Factors in the Upper Reaches of the Rio Grande
The purpose of this study is to investigate the determination of Manning's roughness in the upper Rio Grande river basin and compare results to other studies where Darcy Weisbach friction...

Floodflow Effects on Riparian Vegetation in Arizona
A relation for estimating changes in the condition of riparian vegetation as a function of stream power was developed for stream channels in central Arizona. Flood and vegetation data...

Roughness Coefficients for High-Gradient Channels in New York State
Manning's roughness coefficients (n values) were computed for a range of flows at six streams in New York State (USA) that have high energy gradients (greater than 0.002) and large median...

Bias in Regression Estimates of Manning's n
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...

Supercritical Flows Versus Subcritical Flows in Natural Channels
Many analysts model large discharges and/or high-gradient reaches as supercritical flow. While this assumption may be valid for man-made channels of smooth, non erosive materials, and...

 

 

 

 

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