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

Multilingual Technical Dictionary (MTD)
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Term No.Term Name/Term DescriptionAction
5190
Dead furrow
1 - A double furrow left in the middle of the field or between two lands in ploughing (illustrated). 2 - In the bedding system of surface drainage, dead furrows are the linear depressions separating low narrow parallel ridges formed by ploughing. The dead furrows are of a flat V-shape and they discharge water into a field drain, constructed at the .....
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1556
Dead man, or Deadman
A log or baulk of timber buried in the ground to provide an anchorage for a cable, placed at right angles to the direction of pull on the cable......
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2116
Dead soils
Soils having a top layer of peat lump.
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2394
Dead storage capacity, or Dead storage
The storage volume of a reservoir measured below the invert level of the lowest outlet or the minimum operating level. It is also termed Inactive storage......
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2415
Dead storage level
Level of a reservoir corresponding to the lowest outflow level beyond which the water of the reservoir can not be let off......
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6194
Dead time
1 - Any definite delay deliberately placed between two related actions in order to avoid overlap that might cause confusion or to permit a particular different event to take place. 2 - The delay between two related actions, measured in units of time......
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1157
Dead water
Water that is not flowing with a significant velocity.
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6100
Deadheading
Travelling without load, except from the dumping area to the loading point.
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5732
Dealwood
A term loosely used to denote light timbers used for packing cases, crates and similar work.
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6405
Debris avalanche
The sudden downslope movement of the soil mantle on steep slopes often occurring when the flank of a mountain or volcano collapses and slides downslope.  Occurs under unsaturated soil conditions, as opposed to lahars, which are water saturated mass flows......
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1463
Debris cone, or Detrital cone
A fan-shaped deposit of soil, sand, gravel and boulders built up where a river emerges from highlands into a valley, or where its velocity is reduced sufficiently to cause such deposits......
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8446
Debugging
The process of isolating and correcting all malfunctions and or mistakes in a piece of equipment or a programme of operations......
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392
Deca
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2167
Decalcification
Removal of calcium carbonate from the soil by leaching. Technically, replacement of monovalent metallic ions, such as sodium, by hydrogen ions......
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2421
Decant
To remove or draw water from a reservoir without disturbing the sediment or lower liquid levels.
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4858
Decantation
Method of removing sediment from water by markedly reducing the flow velocity, as in a settling tank, so that sediments can settle, by gravity, to bottom. .....
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7158
Decay rate
The rate or reduction of the concentration of a quantity.   Some decay rates are not linear, but may be expressed in terms of “half‑life”.  .....
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5740
Decay, Rot, or Dote
Disintegration of wood tissues caused by fungi or other micro-organism.
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8861
Decentralisation
A general term for a transfer of authority and/or responsibility for performing a function from the top management of an organisation or the central governance level of an institution to lower level units or the private sector. .....
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7323
Dechlorination
The partial or complete reduction of residual chlorine in a liquid by any chemical or physical process.
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393
Deci
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6885
Deciduous
Falling off at one end of a growing period (season) or at maturity as with some leaves, antlers, insect wings, etc.  Especially, trees that shed their leaves,, as distinguished from evergreens, which commonly do not shed their leaves annually......
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125
Decile
A positional measure comprising one of the nine variate values that divide the total frequency into ten equal parts.
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8615
Decision analysis
1 - Analysis focused on the problem of making a single decision. 2 - See 8830.
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8830
Decision analysis
1 - A process of systematic evaluation of alternative solutions to a problem where the decision is made under uncertainty. 2 - See 8615......
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