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
107
Consecutive average, Moving average, or Consecutive mean
The mean of a small group of consecutive values, especially annual means, assigned to the middle time-term of the group in the process of smoothing, e.g. 5-year mean......
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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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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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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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