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I I I 1 I I I I I I I I I I I I I I I 10 hours; therefore, the requi red fi re fl ow capaciti es for 1985 and 2015 are 4.6 mgd and 5.7 mgd, respectively. When added to the maximum daily demand, these capacities are still much less than the peak hourly demand. Even though fire flow requirements do not control the sizing of the overall di stri buti on system, they do establ i sh mi nimum capaci ti es for the extremiti es of the system. The City of Greeley uses population density and hydrant spacing for determining the fire flow capacities of each distribution pipeline. Greeley has a Class 4 fire insurance rating from the Insurance Services Offices. The rating is based on a scale from one to ten, with Class 1 being the highest rating possible. 2.0 WATER RIGHTS The City of Greeley obtains its water from many sources. The major sources include the Colorado-Big Thompson Project, direct diversion from the Cache la Poudre Ri ver, Wi ndy Gap Project, severa 1 i rri gati on and di tch compani es; and the high mountain reservoirs on the Cache la Poudre River. The Cache la Poudre reservoirs include Barnes Meadow, Comanche, Hourglass, Peterson Lake; Seaman, and Twin Lakes. The water ri ght for Twi n lakes Reservoi r is presented on Tabl e IV. 4. The decreed storage capaci ty is 460 acre-feet. Based upon di scussi ons wi th the Water Comi ssi oner for the Cache 1 a Poudre Ri ver system, the water supply at the reservoi r is based upon the decreed gage hei ght, rather than the decreed storage capacity; For Twin lakes, the spillway crest is at gage height; 19;1 feet, and the correspondi ng capacity is 278 acre-feet. Even at the decreed gage height of 20.0 feet, the capacity is still only 301 acre-feet. The reservoir currently operates under restricted conditions; Table IV.5 shows the nature of the restriction and the date it was imposed by the Colorado State Engi neer' s Office. The earth dam has severe seepage probl ems and an inadequate outlet works. -24-