Unfortunately, there seems to no way achieve this. Even natural rainfall is not completely uniform. Significant effort in irrigation system design and management is directed towards dealing with problems related to irrigation uniformity, or the lack of it. Whenever water is applied with less than perfect uniformity, some parts of the crop will receive more water than others. If the irrigation system is operated so that the part of the crop receiving the most water has its requirement met, then the remainder of the crop will be over-irrigated.
Insufficient water leads to high soil moisture tension, plant stress and reduced crop yields.
Excess water may also reduce crop yields below potential levels through mechanisms such as leaching of plant nutrients, increased disease incidence or failure to stimulate growth of commercially valuable parts of the plant. Irrigation uniformity is also linked to the efficiency with which agricultural resources are used. To the extent that non-uniformity causes crop yields to fall below potential levels, agricultural inputs applied in anticipation of full yields are wasted. Because irrigation uniformity relates to crop yield and the efficient use of resources, engineers regard it as an important factor to be considered in the selection, design and management of irrigation systems. Various measures of uniformity are used as indices of performance by which, for example, sprinklers and sprinkler spacings are judged.