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
46
Peak
A maximum quantity or height that occurs over a relatively short period of time, e.g. peak discharge.
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54
Annual-flood peak series
The tabulation or graph in order of decreasing magnitude of the maximum peak floods of each year.
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921
Design flood hydrograph, Inflow Design Flood
The hydrograph of flow adopted to represent limiting volumes and concentration of runoff for use in determining design capacities of spillways for dams, etc., or other hydraulic studies......
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945
Flash flood
A flood of short duration and abrupt rise with a relatively high peak  discharge, usually resulting from a high intensity of rainfall over a small area......
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946
Flood stage
The elevation of the water surface fixed by local usage above which the stream is considered to be in flood.
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947
Maximum probable flood
Greatest flood that may be expected, taking into account all pertinent factors of location, meteorology, hydrology and terrain......
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948
N-Year flood
A flood which has a probability of being equalled or exceeded once every N-years or has one chance in N of occurring in any one year......
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949
Design flood
1 – Flood discharge taking into account economic and hydrological factors, adopted for the design of a hydraulic structure or river control work. 2 – The flood adopted to control the design of a structure. 3 – The flood against which a given area is to be protected......
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951
Sharp-crested flood
Flood of short duration with a relatively high peak discharge.
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952
Sheet flood
A flood which spreads as a thin sheet of water over a large area and is not concentrated in channels. Sheet floods are of short duration, generally being measured in minutes or hours, and the water is always muddy......
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953
Flood frequency
Over a period of many years, the average number of times a flood of a given magnitude is likely to occur.
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956
Flood wave
Rise of streamflow to a maximum crest and its subsequent recession, caused by a period of precipitation, snow melt, dam failure or hydroelectric plant release......
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1257
Peak flow
Maximum value of water flow following a storm period.
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1570
Flood flanking
The construction of an embankment by depositing stiff moist clay in separate, small loads, so that each shall possibly unite with the other, while the crevices left when the clay has dried out, are filled with sludging......
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1960
Daily range of soil temperature
The difference between the maximum and minimum values of soil temperature.
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2022
Flood tide, or Rising tide
Tides during a period between low water and the following high water.
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2027
Duration of tide, Duration of ebb tide Duration of flood tide
Duration of flood tide or a rising tide is the interval of time from low water to following high water; and duration of the ebb tide or falling tide is the interval of time from high water to following low water. Together, they cover a period of 12.42 hours for a semi-diurnal tide; the duration of the flood and ebb tides is approximately 6.21 hours.....
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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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2084
Tide, daily retardation of
The amount of time by which the corresponding tides grow later day by day (about 50 minutes).
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2385
Flood control reservoir, or Single-purpose flood control reservoir
A reservoir operating on the principle that it will be used for the temporary storage of flood waters for subsequent release as rapidly as channel conditions would permit......
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2396
Flood control storage
Storage capacity provided in a reservoir to absorb or retain flood water in full or part. Water stored during floods is usually released as rapidly as the downstream channel capacities permit......
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2397
Flood storage
The part of the active storage used exclusively for flood control. `Flood storage` should not be confused with `flood surcharge`......
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2399
Flood surcharge, or Surcharge
The volume or space in a reservoir between the retention water level and the maximum water level. Flood surcharge water can not be retained in the reservoir and will flow out over the spillway until the retention water level is reached......
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