Before revision: For regulating rivers Another form of jetties, wing dams are extended out, opposite one another, from each bank of a river, at intervals, to contract a wide channel, and by concentration of the current to produce a deepening.
After revision: For regulating rivers Wing damsOne, form of jetties, wing dams are extended out, opposite one another, from each bank of a river, at intervals, to contract a wide channel, and by concentration of the current to produce a deepening.