Geoscience Reference
In-Depth Information
(a)
Chart
Pen and trace
Float
Chamber
Siphon tube
(b)
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
10
3
9
15 21
3
9
15 21
3
9
15 21
3
9
15 21
3
9
15 21
3
9
15 21
3
9
15 21
3
9
15 21
9
8
7
6
5
4
3
2
1
0
Figure 12.3
(a) Internal mechanism of a natural siphon rainfall recorder and (b) a typical chart produced by the recorder.
(From Sumner, 1988, published with permission.)
The
tipping bucket rain gauge
shown in Fig. 12.4 provides a measure of rainfall
rate at high time resolution without the need for laborious interpretation of charts.
Such gauges are again outwardly similar to professional standard, manually read
gauges, but the water gathered by the funnel is in this case fed into a simple see-
saw (or titter-totter) mechanism comprising two buckets of known volume. The
bucket volume is selected to define the resolution in precipitation amount required.
