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

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Multilingual Technical Dictionary (MTD)

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Term No.

Term Name/Term Description

Action

192

One-sided test, One-tail test, or Single tail test

A test of a hypothesis when the region of rejection is wholly located at one end of the distribution of the test statistic, e.g. when the alternative hypothesis specifies values only to one side of the null hypothesis. The one-tail test may be described more precisely as either a `lower-tail test` or an `upper-tail test`......

193

Two-sided test, or Two-tail test

A test of a hypothesis when the regions of rejection are located at both ends of the distribution of the test statistic.

211

One-sided confidence interval

When T is a function of the observed values, such that q being a population parameter to be estimated, the probability Pr (T * q) or the probability Pr ( T > q) is equal to 1- a (where 1-a is a fixed number, positive and less than 1). The interval from the smallest possible value of q up to T, or the interval between T and the greatest possible val.....

841

Drainage area, Drainage basin, River basin, Catchment area, Catchment basin, Catchment, Watershed

The area from which a lake, stream or waterway and reservoir receives surface flow that originated as precipitation.

965

River basin management, Watershed management, or River management

Planned use of river basins in accordance with predetermined objectives.

966

River basin model, or Watershed model (US)

Numerical model simulating major hydrologic processes occurring in the catchment area of an entire river system.

967

The flow characteristics of a stream with respect to velocity, volume, form of and alterations in the channel, sediment-transporting capacity and the amount of material supplied for transportation......

1316

Poised river, or Stable stream

A river or stream which, as a whole, maintains its slopes, depths and channel dimensions without any noticeable raising or lowering of its bed. Such a river may temporarily suffer from a geological point of view, but for practical engineering purposes can be accepted as one of considerable stability......

1317

A river formed in alluvium, typically transporting sediment similar to that comprising its bed and banks, and characterized by the processes of aggradation and degradation (scour)......

1318

Eroding river, or Degrading river

A river continuously eroding its bed or banks.

1319

Depositing river , or Aggrading river

A river continuously depositing the sediment load transported by it, on its bed or banks.

1323

A river which has cut its channel through the bed of the valley floor, as opposed to one flowing on a floodplain.

1325

A river with an extremely wide and shallow channel, when the normal river flow passes through a number of smaller interlaced channels separated by bars or shoals. In such rivers, there is a little tendency to meander, though local meandering in the minor channels may generally occur (illustrated)......

1327

A river in which flow and water surface slope are affected by tides. In some rivers, the effect may extend a hundred miles or more upstream from the mouth, sufficient to even temporarily reverse the direction of flow of the stream......

1331

In geological terms, a river is young when it is actively eroding its channel.

1332

Mature river, Old stream

A stream with reduced slope so that the water velocities are just sufficient to carry the detritus delivered by the tributaries, having steeper slopes than the main stream. When all channels, including wet weather rills are graded, the stream system is said to be `old`. `Old stream` has a wide floodplain, a broad meander belt, and gentle slopes......

1336

River capture, or River piracy

Process by which one river having better rapid power of erosion than another, cuts into the headwaters of the latter and takes over some of its tributaries......

1381

Alluvial material in stream beds and flood channels subject to erosion and deposition.

1427

Concave (river) bank

The bank on the outside of a river bend. The radius of a concave bank is generally greater than that of the convex bank.

1428

Convex (river) bank

The bank on the inside of a river bend (vs. concave bank).

1456

The height of water surface in a river above some arbitrary datum.

1457

Bed building stage of river, or Mean water stage of river

The river stage corresponding to the maximum of the sediment runoff curve.

1474

River breathing

Fluctuations of water levels in a river.

1477

River training, or Channel regulation

1. Engineering structures (including artificial plantations) with or without the construction of embankment, built along a river or a section thereof, to direct or lead the flow into a prescribed channel. 2. The modification of a river, by man, to allow or enhance navigation by developing a waterway of required depth either by construction of a ser.....

1578

River whose substratum contains a large number of coarse materials (with diameter reaching several decimeters) in a wider granulometric study......

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