break to the season? >> right. exactly. >> reporter: each morning, hanks wakes up to an e-mail from his bosses telling him how much water there is and whose irrigation ditches will get filled. >> this one has been turned off before. >> reporter: colorado prioritizes who gets water through a system of inherited claims that reaches back to the 19th century. >> i'm satisfying everybody that has may 15, 1874 and before. >> reporter: if my seniority dates back to 1880 you're out of luck? >> you're out of luck by six years. >> reporter: when there's not enough, he has to manually turn off the flow and post a notice there is no more water. >> we're going to shut it all the way down. >> reporter: this summer hanks has cut off the water to all but two farms and ranches. what's the worst thing anyone's ever said to you? >> probably not for television use. >> reporter: do they question your heritage?