With the increase in the ID of PT, the relation deviates from the logarithmic curve that represents all drippers together. However, when increasing the range of MT drippers, for diameter size, the relation significance becomes very strong for bouts ID and OD. Metal and plastic tubes (MT and PT) as the most present dripper types showed a strong relation between the outer diameter (OD) and drop size, while the inner diameter (ID) relation was moderate-to-weak. However, usually there are more factors that do not correspond to natural rainfall, such as the median drop size, volume and kinetic energy.
The analysis showed that DRS can provide rainfall that corresponds to natural rainfall, except in terms of the drop size distribution and wetted area. A statistical analysis was performed for the performance of the DRS, wetted area, drop size, rainfall intensity, duration and kinetic energy. DRS performance was analyzed integrally, for simulators with more than one dripper (DRS>1) and with one dripper (DRS=1). The aim of this research is to provide insight into the capabilities of existing dripping rainfall simulators (DRS) to mimic natural rainfall and the frequency of simulated rainfalls of certain characteristics, facilitate the selection of rain simulators that would best meet the needs of soil research and to reach a step closer to the standardization of rainfall simulators. Depending on their performance, they could be appropriate for some soil research or not. Rainfall simulators represent often-used equipment for soil research.
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