VIRTUAL TOUR OF THE WEATHER STATION
EVAPORATION
The station determines evaporation amounts in two ways. Day to day evaporation amounts are calculated from a piché evaporimeter housed in the Stevenson screen. At the end of each month these daily amounts are added up to give a total for the month. In addition, a check is kept of the changing water level in an evaporation pan (pictured). A Hook gauge is placed inside the stilling well and the difference from the previous reading (less any rainfall) gives the evaporation (in mm) since the reading was last made. Where possible a total is calculated each month, although there may be periods in which readings cannot be taken accurately owing to icing of the surface.
