What do you mean by drift loss in a cooling tower? How do you compensate for the same when multiple towers/cells are installed adjacent to each other?

Drift losses refer to the amount of total tower water flow escaping the cooling tower. Because of their operation principle, which requires spraying water across or through which a stream of air is passing, water droplets are incorporated into the air stream. Os one of the components of the make up water in a cooling tower. Thanks Paulo Santos

Drift loss is the quantity of water loss as small water drolets from the tower top,

It is made up by injectiong fresh water in the cooing water network

 

Small water particles carried away by the air from cooling tower is know as drift loss, generally drift looses is from0.001 to0.003.