148 



INDEX 



Classification of backwater curves, 64 

 Coefficients for D'Aubuisson formula, 

 129 



for Manning and Kutter formulas, 5 

 increase due to curvature, 114 



for Nagler formula, 128, 129 

 Conjugate depths, 28 

 Control, point of, 70, 94 

 Conveyance, 80 

 Coriolis's coefficient, 47 

 Counter-disturbances, 119 

 Critical depth, 18, 27, 38 



criteria, 38 



in non-rectangular channels, 38, 45 



in circular cross sections, 42 

 Critical flow, 18, 23 

 Critical flow channel, 48 

 Critical slope, 64, 85 

 Critical velocity, 18, 23 

 Cross section, 1 



computing hydraulic properties of, 97 

 Curvature, friction loss due to, 114 



Dams, hydraulic jump below, 32 



backwater curves above, 60 

 Darcy, 52 



D'Aubuisson formula, 129 

 Dentates, 33 



Depth, critical, see Critical depth 

 Depths of equal energy, see Alternate 



depths 

 Diagonal sills, 119 

 Direction of step computations, 94 

 Discharge, 2 



determining, 96, 127, 129, 131 



in uniform flow, 4 

 Disturbances, in high-velocity flowaround 



bends, 119 

 Drowned hydraulic jump, 32 



Eddy in re-entrant angle, 116 

 Eddy loss, 100 

 Ellms, J. VV., 33 



Empirical coefficients and exponents, 80 

 Energy, incorrect usage of, 3 

 Energy coefficient, 47 

 Energy line, 3 



Energy loss in the hydraulic jump, 32 

 Entrance to a uniform channel, 91 

 Equal energy, depths of, see Alternate 

 depths 



Erosion at bends, 115 

 Expanding or diverging flow, 71, 73 

 Expanding pipe, 16 



Experimental verification of backwater 

 curve theory, 75 

 of jump theory, 28 



Fall in reach, 104 



Ferriday, 29 



Flood routing, 133 



Flood routing slide rules, 137-145 



effect of power or irrigation draft, 143 



effect of tributary flow, 143 



effect of storage under backwater curve, 

 145 

 Flow, converging or diverging, 71, 73 



critical, see Critical flow 



slowly varied, 133 

 Flow around bends, 110 



at greater than critical velocity, 116 



at less than critical velocity, 1 10 

 Flow problems, analysis of, 84 

 Friction loss coefficients, 5 



increase due to curvature, 1 14 

 Friction slope, 63 



by Chezy formula, 64 



by Manning or Kutter formula, 76 

 Friction slope curves, for step methods, 

 102 



Ganguillet-Kutter formula, 4 



use in backwater computations, 71, 76, 

 80, 101, 108 



values of " » " for, 5 

 Gibson, A. H., 28 

 Graphical method for backwater curves, 



75 

 Graves, Q. B., 135 

 Grimm, C. I., 96, 103 

 Grimm's method, 103 

 Grover, N. C, 103 



Head, static versus velocity, 20 

 Head increaser, 32 

 Helicoidal flow in bends, 113 

 Herbert, J. K., 113, 114 

 High-velocity flow around bends, 116 

 Hinds, Julian, 125 



Horizontal channels, backwater compu- 

 tations in, 70, 83, 108 

 Hosig, I. B., 30 



