In this chapter, results of the full-scale comparison test of the driving rain gauges are presented. Two driving rain gauges were developed at the TUE (called TUE-I and TUE-II) and, thanks to collaboration with the Chalmers University of Technology (CTH) and the Technical University of Denmark (DTU), two other driving rain gauges were included in the test. The gauges are described in sections 3.2.5 and 3.2.6.
Section 4.1 gives an overview of the driving rain measurements. Whereas the full-scale measurements at the Main Building comprised a period from December 1997 to November 1999, the period during which all four driving rain gauges were simultaneously operational, lasted only from October 1998 to January 1999. In sections 4.2 and 4.3 the measurement readings of the gauges and their differences are discussed in detail. Section 4.4 summarises the observations.
A full presentation of the measurements of wind, rain and driving rain is given in chapter 5. It is inevitable to refer to chapter 5 from time to time in the present chapter, as some results in the present chapter are related to the reference wind and rain measurements. Data processing and selection criteria and the definition of the quantities used are explained in section 5.1.