262 



INDEX. 



E. Page. 



Efficiency, definition of 36 



general formulation of 192 



in relation to discharge 144, 148 



In relation to fineness 154 



in relation to slope 121-123 



values of, corresponding to adjusted values of capacity, table of. 75-87 



Efficiency and capacity, table comparing parameters in functions 



Of 123 



Eger, Dix, and Seifert on scale of a model of Weser River 237 



Energy, effect of load on 11, 225-227 



relation of, to competent slope 64 



Error, probable, for stream traction 56, 73-74,94, 113, 142-143, 151-153 



probable, for flume traction 206 



Eshleman, L. E., work of 9 



Experiments, method of making 10, 22-26 



nature and scope of 17-18 



results of 240 



F. 



Fargue, L., cited 197 



on scale of model river footnote, 237 



Feeding of debris, suggested apparatus for 241 



influence of, on capacity 56 



methods of 23 



Fineness, bulk, definition of 21, 35, 183 



bulk, relation of, to values of <r , table showing 68 



competent 151 



constant linear, variations of 153 



control of constants by 133 



influence of, on the relation of capacity to form ratio, table of 



quantities illustrating 133 



in natural and artificial grades of debris, range and distribu- 

 tion of, curve illustrating 181 



linear, definition of 21, 35, 183 



mean, changes of, in natural streams 221-222 



definition and measurement of 182-184 



mixtures of diflerent, experiments with 169-185 



of grades of debris 21, 199 



of mixed grades and their components 180 



relation of, to a 67-71 



relation of capacity to 150-154 



for natural grades 180-182 



Fineness factor, applicability of, to natural streams 235-236 



influence of 10 



Flow of water, rhythm in 242-244, 248-249 



Flume traction, definition of 15 



discussion of 199-218 



dune action in 202 



experiments with, apparatus used in 199-201) 



grades of de'bris used in, table of 199 



movement of de'bris in 201-203 



mbvement of particles in 200-201 



nature of 11-12 



rough surfaces used in experiments on, plate showing 200 



scope of experiments on .. 18-19 



speeds of coarse and fine de'bris in, table of 200 



table of observations on 202-203 



Form factor, influence of 10 



Form ratio, computation of 94 



definition of 35-36 



discussion of, table of observations for 51-52 



for natural streams 223 



influence of 116-117 



of unloaded streams in flumes, table of 213 



optimum 134-136 



relation of capacity to 124-136,190-192 



required to enable a given discharge, on a given slope, to 



transport its maximum load, table of values of 135 



Form-ratio factor, applicability of, to natural streams 236 



Formulation based on competence, discussion of 186-190 



Froude, William, on proportionate resistances of ships 237 



Grades of de'bris 21, 199 



See alto De'bris. 

 Graphic computation, accuracy of 95 



use of 94-95 



Gue"rard, Adolphe, observations on the Rhone by 231 



H. Page. 



Head of water, determination of 23 



Hearson, T. A., on velocities in similar streams 23" 



Hider, Arthur, on dunes in Mississippi River footnote, 31, 231 



on intervals between dunes footnote, 243 



Hooker, E. H., cited 195 224 



Hopkins, William, on the law of stream traction 16, 162 



Humphreys and Abbot cited 229, 231 



I. 



Index of relative variation, nature of . . 97-99 



synthetic, nature of 99 



Index to symbols 13-14 



Intake influences, nature of 55 



Interpolation, procedure in 72-73 



Interpolation formula, selection of 60-65 



J. 

 Johnson , Willard D . , acknowledgments to 9 



K. 



Karlsruhe, laboratory of river engineering at. ... 16 



L. 



Law, Henry, on the law of stream traction 16,162 



Lechalas, C., on advance of dunes 232 



Lechalas, formula of _, 192-195 



Le Conte, J. N., acknowledgments to '. 9 



calibration of I'itot-Darcy gage by 252 



Leighton,M. O., acknowledgments to 9 



Leslie, Sir John, on the law of stream traction 16, 162 



Letters and symbols, index to 13-14 



Levee, natural, formation of 222 



Load, definition of 35 



effect of, on the stream's energy 11,225-227 



effect of addition of, on velocity , . 246-247 



effect of rhythm on 53 



method of determining 24-25 



observations on, table of 38-54 



partition of. 230-233 



See also Capacity. 



Login, T., experiments by, on competent velocity 163 



Loire River, observations on 232 



subaqueous dunes of, table of data on 194 



McGee, W J, originator of term saltation 15 



McMath,R. E., description by, of the movement of de'bris 156 



on the building of bars 232 



Manson, Marsden, on suspended load of Yuba River 223 



Matthes, Francois E . , acknowledgments to 9 



Mississippi River, dunes in 31, 231-232 



suspended load of 229 



Mobility of debris, causes affecting 178-179 



Moving field, apparatus for 27,249-250 



Movement of de'bris, collective 30-34, 201 



modes of 11,15 



Movement of par; icles 26-30, 200-201 



Murphy, E. C.,on the movement of dunes and antidunes 32-33 



work of 9 



Notation .. 13-14 



Observational series, definition of 55 



Observations on load, slope, and depth, table of 38-54 



on competent discharge, table of " 70 



on competent slope, table of 69 



See also Experiments. 

 Outfall, contracted, effect of approach to, on velocity 245 



effect of approach to, on velocity 244-245 



Outfall influences, adjustments for 56-57 



Overstrom, G. A., experiments by, on capacity of launders. 210,216-217 

 Owens, John S., experiments by, on competent velocity 163 



on antidunes footnote, 32 



