cover image: Central Board of Irrigation. Regime Flow in Incoherent Alluvium

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Central Board of Irrigation. Regime Flow in Incoherent Alluvium

1939

It might represent the extent to which the engineer having regard to the maximum local slope available was able to provide the non-silting velocity which the grade of silt admitted to the channel demanded or it might indcate that a fine grade of silt was anticipated the reduced value of the critical velcity ratio assigned being fully appropriate to the silt transported. [...] There wa3 however the difficulty that without regard to the material in which the channel was excavated or the type of silt transported there appeared to be a real and measurable variation in the value of N with the size of the channel. [...] J. M. Lacey6 in 1923 when he remarked that the sand at the bottom of a " live ' river channel was in motion to a considerable depth and that all such channels have a natural depth of scour and a natural width depending on the velocity of the current and the size and weight of the sangrains. [...] In his final analysis of the velocity-hydraulic mean depth relationship the writer had recourse to the Upper Bari Doab data and the Madras Godavari Western delta data the only collections which included the velocity and also permitted of computation of the hydraulic mean depth. [...] All empirical equations framed in the past have suffered from the liability to " departure from class ". In the writer's equation V = cR the coefficient c is a constant when the channel is in perfect regime and the silt grade a constant ; similarly in the equation S c' the coefficient c' is a constant for constant silt grade and perfect-regime conditions.
agriculture environment
Pages
81
Published in
India
SARF Document ID
sarf.146557
Segment Pages Author Actions
Frontmatter
i-v Gerald Lacey view
Chapter I. the Kennedy and Lindley Theories
1-3 Gerald Lacey view
Chapter II Regime as a Physical Concept
4-i Gerald Lacey view
Chapter III Correlation of the Hydraulic Mean Depth With the Mean Velocity and Water Surface Slope
7-i Gerald Lacey view
Chapter IV a General Regime Equation
11-13 Gerald Lacey view
Chapter V Derivation of a New Flow Equation and Computation of Numerical Coefficients
14-16 Gerald Lacey view
Chapter VI Alluvial Channel Shape
17-19 Gerald Lacey view
Chapter VII Derivation of the Wetted Perimeter-Discharge Relationship
20-23 Gerald Lacey view
Chapter VIII the Punjab Research Institute Equations
24-ii Gerald Lacey view
Chapter IX a New Theory Correlating Turbulence Bed Silt Grade and Shock
29-34 Gerald Lacey view
Chapter X Correlation of the Silt Factor and Bed Silt Grade in Coarse Material Dimensional Analysis. Summary of Conclusions
35-40 Gerald Lacey view
Appendices
41-50 Gerald Lacey view
Index
51-62 Gerald Lacey view
Backmatter
63-65 Gerald Lacey view

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