EVAPORATION in hydrology/pan evaporation method

In this video i have explained what is evaporation, factors affecting evaporation, measurement of evaporation. Methods used to find the evaporation like Pan measurement, Empirical formula method, Water budget equation, Energy balance method, mass transfer method. methods used to control the evaporation. An atmometer is an instrument that measures the loss of water from a wetted, porous surface. The wetted surfaces are either porous ceramic spheres, cylinders, plates, or exposed filter-paper discs saturated with water. The evaporating element of the livingstone atmometer is a ceramic sphere of about 5 cm in diameter, connected to a water reservoir bottle by a glass or metal tube. The atmospheric pressure on the surface of the water in the reservoir keeps the sphere saturated with water. The Bellani atmometer consists of a ceramic disc fixed in the top of a glazed ceramic funnel, into which water is conducted from a burette that acts as a reservoir and measuring device. The evaporating element of the Piche evaporimeter is a disc of filter paper attached to the underside of an inverted graduated cylindrical tube, closed at one end, which supplies water to the disc. Successive measurements of the volume of water remaining in the graduated tube will give the amount lost by evaporation in any given time