Basically, it is research and development.
Damage: It will irreversible destroy your accurate laboratory balance.Inaccuracy: Besides that, it'll heat up the adhering air layers and this upstreaming air will cause the object to be lifted up resulting in lower measurements of it weight.
i have 4 disadvantages: 1) The river blocks or impedes ship traffic or barges 2)The homeless tend to group around the river and delta 3)The river causes upstream flooding. 4)It also causes upstreaming erosion