INDEX. 



355 



Needle dams, Louisa, Ky., 219 

 maneuvers, 217 

 remarks on, 224 

 statistics, 274 



Objections to levees, 97 



Observations, erosion Arkansas River, 37 



Obstructions, creation of, 342 



Obstructing navigation, 346 



Ockerspn, John A., "Dredges and Dredging on the 



Mississippi River," 42 

 Ohio River dams, 268 



dikes, 60 



floods, 15 



Open rivers, improvement of, 41 

 Operation of lock gates, 191 

 Ordinary leveling, 23 

 Origin of locks, 2 



Panels, tile, locks, 163 

 Parker gate, bear-trap, 262 

 curves for, 266 



Parmley, W. C., formula for free discharge, 32 

 Paving locks, 159 

 Physical features of rivers, 7 

 Physics and hydraulics, Mississippi River, 34 

 Pilots, liability of, 345 

 Pintles for lock gates, 187 

 Plane-table survey, 21 

 Plans and specifications, 18 

 Po, levees of, 98 

 Poiree needle dam, 217 

 Portland cement specifications, 335 

 Poses, dam at, 247 



cost of, 250 

 Precise leveling, 23 

 Preliminary examinations, 16, 17 

 Preparation for improving a river, 18 

 Principles of German system of regulation, 55 

 Profiles of overflow for weir crests, 31 

 Progress of navigation, i 

 Project for improving a river, 17 

 Proportions for concrete, 164 

 Props of wicket dams, 237 

 Protection of banks at dams, 205 



general, 67 

 levees, 88 



navigable waters, laws, 342 

 Puzzolan cement specifications, 339 



Quantities, materials, specifications, 334 

 Quoins, locks, 158 



Rafter and Williams, experiments on discharge, 29 



Rainfall and run-off, 7 



Rates of currents in rivers, 51 



Ratio of mid-depth, 34 



Reaction breakwater, 128 



Refuse, deposits of, 343 



Regularization, 50 



advantages, as in Germany. 63 

 applicability, 52 

 definition of, 50 

 Garonne River, 53 

 general conclusions as to, 56 

 object, 50 

 on the Elbe, 61 

 principles German system, 55 

 theory, 50 



Regulating weirs in movable dams, 215 

 Remarks on bear-trap dams, 266 

 Boul6 dams, 242 

 curtain dams, 244 

 design, 144 

 drum dams, 260 

 movable dams, 216 

 needle dams, 224 



Remarks on wicket dams, 239 

 Removal of wrecks, 347 

 Reservoirs, storage, effects of, on floods, 108 

 Mississippi, 106 

 Russian, 105 

 Revetments, Mississippi, 71 



spur, 73 

 River basins, 9 

 beds, 8 

 slope, 9 



River outlets, formation of bars, 122 

 improvement of, 122 

 methods of improvement, 125 

 Mississippi River, 129 

 mouth of Brazos River, 124 

 principles governing, 122 

 results of improving, 127 

 single jetties, 128 



Roberts, W Milnor, opposed storage, 101 

 Rock dredge, 46 

 Rod floats, 35 

 Rolling lock gates, 174 

 Rough River lock and dam, 279 



Sale of wrecks, 347 

 Sand cement, 164 



for concrete, 165 



Scouring river bed caused by levees, gfl 

 Scrapers for removing bars, 43 

 Screws for removing bars, 42 

 Sections of dikes, 64 

 levees, 77 



Sediment carried in suspension, 37 

 Sganzin, rates of current, 51 

 Sheathing for lock gates, 186 

 Shoals, 12 



Shutter dams, 252-254 

 Single jetties, 128 



swinging lock gates, 174 

 Sinking vessels, 344 

 Sizes of beams for lock gates, 182 

 locks, 137 



parts of wicket dams, 237 

 Slope, gauges and observations -for, 9, 38 

 Sloughing of levees, 91 

 Snagging, 49 

 Snows, melting of, 8 

 Snubbing-posts for locks, 162 

 Soundings, 25 



by cord, 25 



range line and instrument, 26 

 poles, 28 



two transits, 27 



Spacing beams for lock gates, 181 

 Spar rollers 188 

 Spars for gates, 191 

 Specifications, 294 



advertisement, 294 



cement, 335-339 



coffer-dam, 307 



concrete, 315 



conduct, 331 



cribs, 326 



dwelling, 298 



excavation and embankment, 310 



fence, 304 



foundations 314 



gates, 326, 329 



general conditions. 297 



instructions for bidders. 294 



iron and steel 328 



lock, 306 



outbuilding, 303 



quantities 334 



sills. 326 



stone masonry, 321 

 Spur dikes, 59 



