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Division S-1—Notes

A LOW-INTENSITY, HIGH-UNIFORMITY WATER APPLICATION SYSTEM

^a Dep. of Soil Science, Univ. of Wisconsin-Madison, Madison, WI 53706-1299
^b Dep. of Biological System Engineering, Univ. of Wisconsin-Madison, Madison, WI 53706-1299

^* Corresponding author (kung{at}calshp.cals.wisc.edu)

Rainfall simulators with high uniformity and low intensities are required in many research areas related to environmental quality. To examine the characteristics of field-scale macropore-type preferential flow, we designed a portable water application system suitable to apply water with intensity < 5 mm h^–1 for long-term steady-state infiltration experiments under different climatic conditions. Our results showed that, when water was applied at 345 kPa pressure, the system could deliver 4.36 mm h^–1 of water to 19.2 by 2.7 m with 80 to 85% uniformity, while uniformity of the inner 16.2 by 2.1 m reached 94 to 97%. The performance of this system was not influenced by the ambient wind speed. Lower intensities of water application can be achieved by applying water intermittently.

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