Distribution Uniformity or DU in irrigation is a measure of how uniformly water is applied to the area being watered, expressed as a percentage. The most common measure of DU is the Low Quarter DU, which is a measure of the average of the lowest quarter of samples, divided by the average of all samples. The higher the DU, the better the performance of the system. If all samples are equal, the DU is 100%. DU is calculated when performing an irrigation audit. High-altitude aerial view of irrigation in the Heart of the Sahara Irrigation (in agriculture) is the replacement or supplementation of rainfall with water from another source in order to grow crops. ...
Distribution uniformity is useful when determining the total watering requirement during irrigation scheduling. For example, an irrigator might want to apply not less than one inch of water to the area being watered. If the DU were 75%, then the total amount to be applied would be the desired amount of water, divided by the DU. In this case, the required irrigation would be 1.33 inches of water, so that only a very small area received less than one inch. The lower the DU, the less efficient the distribution, and thus the more water that must be applied to meet the minimum requirement. Irrigation scheduling is the process used by irrigation system managers to determine the correct frequency and duration of watering. ...
The uniformdistributions are simple probability distributions which, in the discrete case, can be characterized by saying that all possible values are equally probable.
A simple example of the discrete uniformdistribution is throwing a fair die (or, "a dice"): Each time the die is thrown, the probability of a given score is 1/6.
Although the uniformdistribution is less commonly-found in nature than the normal distribution (for example), it is particularly useful for sampling from arbitrary distributions, using the inverse transform sampling method or the rejection sampling method[?].
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