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
113
Weighted average, or Weighted mean
An average of quantities that attaches a series of weights to it in order to make proper allowance for their relative importance. A value obtained by multiplying each of a series of values by its assigned weight and dividing the sum of those products by the sum of the weights. For example, a weighted arithmetic mean of x1, x2 ... xn with weights w1.....
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753
Precipitation
The total measurable  aqueous particles of all forms of falling from the atmosphere, including dew, rain, mist, snow, hail and sleet usually expressed as liquid water depth at a given point over a given time.  .....
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754
Convective precipitation
Precipitation resulting from the upward movement of air that is warmer than its surroundings and falls not far from the originating updraft. .....
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755
Cyclonic Precipitation
The precipitation associated with the passage of cyclones.
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756
Orographic precipitation
Precipitation which results from the lifting of moist air over an orographic barrier, such as the windward side of a mountain range......
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757
Antecedent precipitation index
A weighted summation of daily precipitation amounts, used as an index of soil moisture. The weight given to each day’s precipitation is usually assumed to be an exponential or reciprocal function of time with the most recent precipitation receiving the greatest weight. Such indices are used in calculating runoff in numerical watershed models and .....
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758
Maximum probable precipitation
An estimate of precipitation of a given amount and duration derived by a technique of maximization of all contributing factors like moisture content, precipitable water, wind velocity and spatial distribution. It is a value that has extremely low probability of occurrence......
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759
Mean annual precipitation
The average over a period of years of the annual amounts of precipitation.
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760
Weighted mean monthly precipitation
The weighted mean precipitation for each month for a large area derived from the study of the isohyetal map of the area.
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762
Precipitation mass curve
Graph showing accumulated precipitation against time.
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807
Mass rainfall curve, or Mass precipitation curve
A plot of accumulated precipitation against time.
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848
Mean monthly runoff
Arithmetic mean of all the individual monthly mean discharges for a named month in a period of record.
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1160
Mean monthly discharge
Discharge observed or interpolated and averaged over a calendar month.
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1239
Effective precipitation
The portion of precipitation that is available for evapotranspiration;  is able to satisfy evapotranspirative demand.
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2583
Lane`s weighted creep theory
A theory with the premise that the horizontal contacts with the foundation and slopes flatter than 45o, being less liable to have intimate contact, are given only one-third the weightage of steeper (45o equal to or greater than 45o) and vertical contacts while calculating the creep length. The creep length obtained by the above procedure is called .....
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2586
Weighted creep length
Creep length calculated on the basis of different weightages given to horizontal and vertical creeps according to practical considerations. Generally the horizontal contact with the base is less liable to have an intimate contact with the base due to less resistance to percolation are given lesser weightages......
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2588
Weighted creep ratio
The ratio of weighted creep length to the difference in water level at the upstream and downstream of a hydraulic structure (effective head)......
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7953
Monthly flood
The maximum flow occurring in a stream during a calender month.
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