Water supply. Colorado Supreme Court ruling allows Colo. Springs, Pueblo, and four other Eastern Slope cities to change use of Western Slope water from agricultural to municipal. use. Post Ag 22, 1977 p.1,2 Partial change from irrigation use to municipal by the Twin Lakes Resevoir and Canal Co., will allow more diversion of Western Slope water to Eastern Slope. Details. RMN Ag 23, 1977 p.6 Court hears arguments on Denver's obligation to supply water from Dillon Dam to Green Mountain Dam. RMN Ag 30, 1977 p.23