Vaisala WAA151 Installation Manual Page 70

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Installation Manual __________________________________________________________________
68 ___________________________________________________________________ M010114en-B
- Subsoil drainage
- Small scale variability in transpiration and evaporation losses.
It is important to take the degree of variability of these parameters into
account when deciding on the number of probes to be used at any
particular location. If the soil is known to be very heterogeneous, it
will be necessary to take measurements from at least three closely-
spaced locations.
Water Level
Placement of QMV101/QMV102
Place the sensor according to the following examples. Refer to Figure
59 below.
Example 1: Average water level is 25 meters and maximum annual
change is 50 cm. Suitable sensor is with range of 75 cm and
installation place is 24,6 meter from ground level.
Example 2: In dry season the riverbed is dry and in rain season the
ultimate water level is 7 meters. Suitable sensor would be with 10-
meter range. If interested values start after water level is greater than 3
meters, it is possible to use 5-meter version and install it to 3 meters
from ground.
0201-016
Figure 59 QMV102 (QMV101) Sensor in Water
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