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Comparisons between this type of rain gauge and an international standard pit gauge,<br />
mentioned in one of the previous sections, were carried out at De Bilt in 1972-1975.<br />
Two "international" pit gauges were installed next to three "Salland" pit gauges.<br />
salland<br />
pit<br />
J<br />
I I I<br />
I I I I I I I I I I I<br />
0 50 100 150<br />
Fig. 9. Comparison between the monthly precipitation depth measured at De Bilt with the ''Salland<br />
pit-gauge" and the international reference pitgauge (mm).<br />
In Figure 9, the means of the monthly totals measured with the three "Salland" gauges are<br />
plotted against those of .the two "international" gauges. It is seen that there are hardly<br />
any differences between the two types of pit gauges. (De Bruin, 1973).<br />
Unfortunately, it appeared that the daily records of about 30% of the stations were<br />
inadequate (Yperlaan, 1974), so only the data of 42 stations could be used for testing<br />
equation (10) as far as daily totals were considered. For lO-day totals all 65 stations were