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<br />. <br /> <br />. <br /> <br />Table 4. <br /> <br />U.S. Fish and Wildlife Peak Flow Recommendations <br /> <br />The following are our recommendations for peak flows in the 15 Mile Reach': <br /> <br />I) >23,500 cfs in at least five of every 20 years (highest 25% water years) <br />2) 20,500 cfs for those above average years with peaks <23,000 cfs (25%) <br />3) 12,900 - 20,500 cfs to occur with a frequency of no more than 10 of 20 years (50%), - <br />for these below average years, the minimum peak of 12,900 cfs should occur in no <br />more than 4 of every 20 years, i.e., the lowest 20% of water years, <br /> <br />For convenience, these ranges can be simplified io single numbers by taking the mid-point <br />between the low and high end of each range, or by taking the mean of all the peaks within a <br />range that have occurred during the period of record. At the low and high ends of the <br />recommendations there is not a range but rather a minimum high (23,500 cfs) and a minimum <br />low peak (12,900 cfs). Note that >23-,500 cfs is an open-ended recorrunendation, i.e., 23,500 <br />cfs is a minimum, and peaks well in excess of this are also considered beneficial. Because the <br />minimum peak (12,900 cfs) is just that, the minimum, it can be used as the single target flow, <br />Thus, we recommend the following target peak flows: <br /> <br />I) 2..23,500 cfs (5 in 20 years) <br />2) 21,750 cfs (5 in 20 years) <br />3) 16,700 cfs (6 in 20 years) <br />4) 12,900 cfs (4 in 20 years) <br /> <br />W '.bNr~mcn\ol:I'r.l\&Junc1'\u:p6l1 IlIl <br /> <br />) <br /> <br />Source: "Relationships between Flow and Rare Fish Habitat in the '15-Mile Reach' of the Upper Colorado Ri\'er~. U.S. Fish &. Wildlife SerVice, <br />- -- <br /> <br />1995., ' <br /> <br />3 <br />