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
1299
Tidal flats
Areas of nearly flat, barren mud periodically covered by tidal waters.
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1301
Intertidal zone
The area of a shore between the levels of a high and low tide.
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1327
Tidal river
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......
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2004
Tidal marsh
Low, flat marsh land traversed by interlacing channels and tidal sloughs and usually inundated by high tides.
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2028
Tidal range
Difference in height between high and low tidal water level.
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2029
Mean tidal range, Spring range, Neap range
Difference in elevation between mean high water and mean low water; `spring range` and `neap range` are the near ranges of spring tides and neap tides respectively......
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2034
Tidal water level
Altitude reached by tidal surface, usually subdivided as follows : High water (HW) Highest level reached by a rising tide. Higher high water (HHW) : Higher of the two high waters of any lunar day; the high water, occurring daily during periods when the tide is diurnal, is considered a higher high water. Higher low water (HLW) : Higher of the two lo.....
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2039
Tidal bench mark
A bench mark set as a reference to a tide staff at a tidal station and the elevation of which is determined with relation to the local tidal datum......
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2040
Tidal datum
A datum defined by a phase of the tide.
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2045
Tide station, Primary tidal station, Secondary tidal station
A place at which tide observations are taken. It is termed a `primary tide station` when continuous observations are to be taken over a number of years to obtain basic tidal data for the locality. A `secondary tidal station` is one which is operated over a short period of time to obtain data for a specific purpose......
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2048
Tidal bore, or Eagre
High crested roaring wave caused by the rushing of a flood tide up a river or estuary or by meeting of tides (See 7824).
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2049
Tidal current or Eagre
Current caused by the tide-producing forces of the moon and the sun and is a part of the same general movement of the sea that is manifested in the vertical rise and fall of the tides......
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2050
Non-tidal current
Current brought about by causes independent of the tides and includes the permanent current in the general circulatory systems of the sea as well as temporary current arising from meteorological conditions; also, river current......
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2053
Tidal flood current
Current due to flood (i.e. rising).
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2056
Tidal flood interval
Time between transit of moon over meridian of a place and the time of the following strength of flood.
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2057
Tidal flood strength
Tidal flood current at the time of maximum velocity.
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2063
Tidal outlet, or Tidal sluice
A structure to control the outflow of water.
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3601
Tide lock, or Tidal lock
A lock connecting a navigable canal to a tidal river, estuary or tidal basin, provided with single or double opposed gates on one or both sides, so that the craft can pass either way at all times. Depending upon the relative water levels, tidal locks may have single opposed or safety gates or, as is more usual, two sets of double opposed gates oper.....
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3604
Tidal lock with struts
A tidal lock having a single gate system at each end, but provided with struts, which come into operation only when the lock is to be used in the reverse direction. Such an arrangement is made in those tidal locks that face infrequent fluctuations and handle light traffic......
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6764
Tidal marsh
Low, flat marshlands traversed by interlaced channels and tidal sloughs and subject to tidal inundation. Normally the only vegetation consists of salt‑tolerant bushes and grasses......
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