70 ILCS 605/12-1
A landowner within any drainage district has the right to use the ditches and drains of the district as outlets for any drains, either open or covered, which he may desire to construct for the more complete drainage of his own land; provided, however, that hereafter when any such drain is connected with any ditch or drain of the district, a proper bulkhead, spillway, drop box, pipe outlet, junction box or other suitable structure shall be constructed and thereafter maintained by the landowner so as to prevent damage to the ditch or drain of the district. The landowner shall obtain the approval of the commissioners as to the type, design and method of construction of the structure before making any connection and the construction thereof shall be subject to the supervision and control of the commissioners. Any landowner who fails to construct such an outlet structure is liable for all damages resulting from such failure. If, after written request by the commissioners to do so, the landowner fails or refuses to construct such an outlet structure, then the district may build the same and recover the cost thereof from the landowner.
70 ILCS 605/12-1