The Board may, in addition to the powers conferred upon it by section seventeen of the principal Act, take over and assume full control and management of all privately constructed drains through private lands having an outfall or carrying water, either directly or indirectly, to any of the Board's drains, and for this purpose may exercise and do all or any of the powers, authorities, acts, and things that are conferred upon it or which it is authorized to do by the principal Act in relation to any drains under its control and management, including full power and authority to enter all private lands wherein such drains are situate for the purpose of viewing the same.