These Rules, for purposes of preventing erosion of the soil, place restrictions on the cultivation of land, the cutting of vegetation and the grazing of livestock on slopes exceeding a specified degree and near to watercourses. Exemptions may be granted by the Director of Agriculture, a provincial agricultural officer, a district agricultural committee or any authorized officer. Persons shall follow orders of authorized officers regarding the flow of water and no person shall obstruct the flow of run-off water.