Colo. Rev. Stat. § 37-84-125
It is the duty of every such person, taking water from any ditch, canal, or reservoir, to be used for irrigation purposes, on finding that he is receiving more water from such ditch, canal, or reservoir, either through his headgate or by means of leaks, or by any means whatsoever, immediately to take steps to prevent his further receiving more water from such ditch, canal, or reservoir than the amount to which he is entitled. If knowingly he permits such extra water to come upon his land from such ditch, canal, or reservoir, and does not immediately notify the owners of such ditch or take steps to prevent its further flowing upon his land, he shall be liable to any person, company, or corporation who may be injured by such extra appropriation of water, for the actual damage sustained by the party aggrieved. The damages shall be adjudged to be paid, together with the costs of suit, and a reasonable attorney's fee to be fixed by the court and taxed with the costs.
C.R.S. § 37-84-125