International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage

Multilingual Technical Dictionary (MTD)
<<    Browsing page 1 of 4    >>
Term No.Term Name/Term DescriptionAction
198
Maximum likelihood method
The method of estimating a parameter (or parameters) of a population by that value (or values) which maximizes (or maximize) the likelihood of a sample......
Similar Terms
243
Least square method
A method of determining the arbitrary constants in the equation of a curve, based upon the principle that the most probable value of a quantity to be deduced from a set of measurements is obtained by making the sum of the squares of the residual (deviations from it) a minimum......
Similar Terms
265
Freehand method
A method of describing the relationship in a series of data, ordered in time or space, whereby the general trend is estimated by drawing a line freehand through or near the series of plotted observations. Hence `freehand fit`......
Similar Terms
268
Moving average method of fit
The averaging at the central year of a series of overlapping means to smooth out, or damp down, undue high and low, short-term values. Hence, the `moving average fit`. (See also 279)......
Similar Terms
1171
Cloud-velocity gauging, Allen`s method of velocity gauging, Colour-velocity gauging
A method of determining the velocity of a slug of dye between two stations in the channel. This velocity, assumed to be the mean velocity of flow, multiplied by the cross-sectional area of the channel, gives the discharge. `Allen`s method` and `colour-velocity method` are different forms of cloud-velocity gauging......
Similar Terms
1232
Integration method of velocity measurement
A means of determining the mean velocity at a vertical depth of a stream by noting the total number of revolutions of a current meter vane and the time consumed, while the meter is slowly lowered from the surface to the bed and returned one or more times......
Similar Terms
1923
Endodermis, Starch sheath
Innermost layer of the cortex, sometimes containing starch grains (illustrated).
Similar Terms
2062
Warping, or Commutation method
A process of allowing the tide to overflow low lying lands so as to deposit thereon the silt which it carries in suspension......
Similar Terms
2284
Method of independent variables, or Khosla`s method of determination of uplift pressures and exit gradients
It is an empirical method evolved by an Indian Engineer A N Khosla for determining uplift pressures with high accuracy for a weir founded on permeable soils. The complex foundation profile is broken up into a number of simple profiles, each of which is independently amenable to mathematical treatment......
Similar Terms
2335
Gravity dam, Solid gravity dam, Curved gravity dam, or Gravity arch dam
It is customary to confine the term `gravity dam` to solid masonry or concrete dams that resist their imposed loading by the weight of the structures themselves. However, if the dam is sufficiently curved upstream in plan for its entire length, a portion of the imposed loading may be borne by arch action such dams are called `gravity arch dams`......
Similar Terms
2344
Multiple arch-buttress dam
A type of buttress dam, consisting of a series of arch barrel segments supported by buttresses. The load is transferred by the several arches to the foundations through the buttresses......
Similar Terms
2351
Arch dam, Arched dam, or Massive arch dam
An arch dam is a solid concrete or masonry dam curved upstream in plan whereby, in addition to the resisting a part of the pressure of the reservoir by its own weight, it is not only able to resist the reservoir pressure due to own weight but also acquire a large measure of stability by virtue of transmission of the part of water pressure or load b.....
Similar Terms
2352
Constant radius arch dam, Constant centre arch dam, or Constant centre dam
An arch dam when the centre of its upstream and downstream faces and the centre line are coincident with the axis centre at all elevations (illustrated)......
Similar Terms
2353
Constant angle arch dam
A type of arch dam wherein all the arch rings have a constant value of central angle (illustrated).
Similar Terms
2354
Variable radius arch dam, or Variable centre dam
A type of an arch dam when neither the radius nor the central angle is constant. This dam is a compromise between the constant radius and the constant angle arch dams (illustrated)......
Similar Terms
2355
Arch dam in series
A series of arch dams placed one after the other in descending heights, the space between successive arches is filled with water to the level of the crest of the lower arch; thus limiting the pressure on each arch in proportion to the difference in height of the two successive arches, consequently the arches would be of constant thickness. This eff.....
Similar Terms
2449
Arch abutment
The abutment of an arch element at the surface at either end of arch that contacts the rock of the canyon wall. Arch loads are transferred through the arch abutments to the canyon walls......
Similar Terms
2450
Arch centre line
An arch centre line is the locus of all median points of the thickness of an arch section.
Similar Terms
2451
Line of arch centres
The line of arch centres is a line passing through the arch centres in plan or profile. Arch centres are so located that they will be on smooth profile curves in a vertical plane. In the case of a constant-centre type of arch dam a single vertical line will be the locus of the arch centres. For variable centre dams separate profile curves will be t.....
Similar Terms
2452
Arch element
An arch element or arch is a portion of a dam bounded by two horizontal planes at a distance of one unit apart.
Similar Terms
2453
Arch section
A section representative of an arch dam as it would appear if cut by a horizontal plane.
Similar Terms
2456
Central angle of arch dam
The central angle of an arch is the angle bounded by lines radiating from the arch centre to points of intersection of the arch centre line with the abutment......
Similar Terms
2566
Gravity method (two-dimensional method of analysis)
A method for stress analysis of gravity dams assuming the structure of the dam to be composed of vertical cantilever elements that act independently of each other while the vertical stress varies linearly......
Similar Terms
2567
Slab analogy method
A two-dimensional method of studying the non-linear distribution of stresses in a dam by considering the analogy between the stresses in a two-dimensional elastic body and the deflections of an unloaded slab of the same shape bent by forces and couples applied round its edges......
Similar Terms
2568
Lattice analogy method
A three-dimensional method of analysing stresses in a dam by considering it a frame consisting of diagonally braced squares......
Similar Terms
<<    Browsing page 1 of 4    >>