Hydraulic Manual Consisting of Working Tables and Explanatory Text Intended as a Guide in Hydraulic Calculations and Field OperationsCrosby, Lockwood and Company, 1883 - 491 páginas |
Otras ediciones - Ver todas
Hydraulic Manual Consisting of Working Tables and Explanatory Text Intended ... Lowis D'A Jackson Sin vista previa disponible - 2015 |
Términos y frases comunes
adopted amount applied ashlar bends bottom calculated canal catchment area coefficient coefficient of discharge correct corresponding cubic feet cubic foot culverts curve cylindrical D'Arcy and Bazin deduced depth of water determined diameter dimensions drainage drains effect engineer equation experiments extreme fall feet per second field-drains float flume foot formula gauging given head of pressure height hence hydraulic radius hydraulic slope inches inclination irrigation length loss of head lower masonry maximum velocity mean velocity measured ment meter method mètres mid-depth miles Mississippi mode module obtained open channels ordinary orifice overfall parabola pipes practical quantity rainfall ratio rectangular reduced reservoir sectional area sill sluice soil Sper square square miles stoneware stream supply surface velocity Table XII tion transverse Trapezoidal tube values various vary velocity observations velocity of discharge vertical plane water surface weir width ΙΟ
Pasajes populares
Página 80 - ... from the falsification of results by using many different complicated instruments, possessing inherent errors, and not admitting of a just comparison ; the Mississippi observations being conducted on a very large scale, and in the simplest manner possible, have brought forth very important results. From their experimental data it has been deduced that the velocities at different depths below the surface in a vertical plane, vary as the abscissae of a parabola, whose axis is parallel to the water-surface...
Página 4 - ... orifice. In the construction of water works, it is customary to conduct the stream, or such a part of it as is required, into a cubical cistern, and to let it issue from the side of this, near to the bottom, and thus fall upon the main wheel.
Página ii - MODERN METROLOGY. A Manual of the Metrical Units and Systems of the present Century. With an Appendix containing a proposed English System. By Lowis DA JACKSON, AM Inst. CE, Author of "Aid to Survey Practice,
Página 97 - The ratio of the mid-depth velocity to the mean velocity in any vertical plane is practically independent of the depth and the width of the stream, of the mean velocity of the river, of the mean velocity of the vertical curve, and of the locus of its maximum velocity. In other words, it is a sensibly constant quantity for practical purposes.
Página 91 - ZtH in the 45 curves of the Roorkee Experiments will show that the range of this quantity is — except for verticals quite close to the vertical walls of the rectangular channel (ie for all verticals more than 5...
Página 86 - The first will be recognised as Simson•s well-known formula, that is of no use for practical determination of U, as it involves the bed-velocity which does not admit of direct measurement. The other three give simple values, easily applicable to practical velocity- measurement. Two-velocity Formula.
Página 94 - ... depth (by definition) ; so that the middle ordinate always > the mean ordinate ; also, when the curve is very flat, it is clear that the excess of the former over the latter must be a small quantity.] This is fully borne out by the Roorkee Experiments : the value of the quantity (v\B— IT) is given for every series in Abstr.
Página 197 - In comparing unlike curves ; of unlike curves under thesame external conditions at the same site of rectangular section, the mid-depth curve is usually the outer, the mean velocity curve intermediate, and the bed curve the inner.
Página 96 - the absolute numerical value of the ratio for any curve of actual observations.' But the argument is inconclusive on account of the uncertainty (and probable incorrectness as general truths) of the two assumptions p = H1-±-V~jrV and U='93V approximately.
Página 86 - X, ft, v, it seems worth while to inquire whether an expression could be found for the mean velocity involving velocity-measurements at only two (instead of three) distinct points, as this would materially reduce the fieldwork necessary to find the mean velocity. It is sought then to determine a, /3, X, /x, so as to determine U by the simpler formula — Z7=aWA* + /8«**, . . . (18).