Government may prohibit formation of obstructions of rivers etc, within certain limits

Whenever it appears to the Government that injury to the public health or public convenience or to any canal or to any land for which irrigation from a canal is available, has arisen or may arise from the obstructions of any river, stream or natural drainage course, the Government may, by notification, prohibit within limits to be defined in such notification, the formation of any such obstruction, or may, within such limits, order the removal or other modifications of such obstruction and thereupon so much of the said river, stream, or natural drainage course, as is comprised within such limits, shall be held to be a drainage work as defined in section 2.