Description

 Open Pan Evaporimeter:

Open Pan Evaporimeter consists of a cylindrical reservoir of
fixed diameter and depth, filled with water to a few centimeters below the rim.
A fixed – point gauge in a stilling well server to indicate the level of water
in the pan. A calibrated measuring cylinder is used to add or remove water at
each observation to bring the water level to the fixed point the cross section
area of the measuring cylinder is such that the number of millimeters of water
added from the measuring cylinder divided by 100 lives the amount of the water
in milli meters which has evaporated from the pan during a given interval of
time the reservoir is covered with wire- mesh netting to protect the pan from
birds and animals. A thermometer suspended from a mount clamped to the side of
the reservoir records the Temperature of the water in the pan.