765 ILCS 130/12

Whenever a division fence shall be injured or destroyed by fire, floods, or other casualty, the person bound to make and repair such fence, or any part thereof, shall make or repair the same, or his just proportion thereof, within ten days after he shall be thereto required by any person interested therein--such requisition to be in writing, and signed by the party making the same: Provided, that when a flood gate or that portion of a division fence which crosses a stream or natural water course is destroyed by flood, the person bound to make or repair the same shall make or repair the same or his just proportion thereof within two days after he shall be thereto required by any interested person.