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<br />~ <br /> <br />I. <br /> <br />:- ~-' , <br />::-"):d <br />:'~"~'.~ <br /> <br />"J.,:' <br />" -~ :'."j.: <br /> <br />'-',' <br /> <br />. <br /> <br />001008 <br /> <br />13. OOWNSTREAM CHANNEL CAPACITY <br /> <br />Muddy Creek from Paon1a Dam to Anthracite Creek (about 0.5 miles) has a <br />large cl1annel capacity, and no damage is experienced from flood flOlls in <br />this rea.ch. Muddy Creek and Anthracite Creek cOlllbine to form the North <br />Fork Gunnison River vhich flows for 28 miles in a southvesterly direction <br />to join Gunnison RiveT. Although the entire length of North Fork Gunnison <br />River consists mostly of unimProved c:hannels, it is only the 15-ll1Ue reac:h <br />located between the small communities of Somerset and Hotchkiss where fre- <br />quent flood daDBges are experienced, and wbere the safe ehMnel capacity <br />is estimated at 3,500 c.f.s. <br /> <br />14. FLOOD DAMAGES <br /> <br />Flood dauBges caused by North Fork Gunnison River are of snOWlelt type <br />exclusively. The flood damases are confined llBinly to agricultural de- <br />velopment along the lS-mUe reac:h betveen Somerset and Hotchkiss. Few <br />estimates of flood ~es are available far North Fork Gunnison River. <br />However, damages caused by the 1957 flood based on prices and conditions <br />at the time of the flood are estillBted at $a6,300. The folIeving table <br />illustrates the magnitude, :!'requenc:y, and IIIIIOIUlt of corresponding dam- <br />ages for North Fork Gunnison River floods. <br /> <br />(. <br /> <br />Estimated Flood !mlBp;e_Frequency <br /> <br />North Fork Gunnison River at Somerset, Colorado <br /> <br />Disdlarge <br />cfs <br /> <br />Times far 100 years <br />exceeded <br /> <br />I8DBge <br />$ <br /> <br />*3,500 <br />5,700 <br />6, roo <br />8, roo <br /> <br />o <br />48,000 <br />70,000 <br />115,000 <br /> <br />50.0 <br />10.0 <br />5.0 <br />1.0 <br /> <br />~ <br /> <br />*!oBXimUIII nOl"ul'l""'g1ng disc:harge. <br /> <br />The estimated average annual preproject flood damages along North Fork <br />Gunnison R1ver.are $13,000. <br /> <br />15. PROTECTION PROV:rreo <br /> <br />Because of limitations on storage (as explained in paragraph UJ) operation <br />of Paonla' !lam and Reservoir \IOuld not control all floods of record to ob.1ec- <br />t1ve pro.lect flOll!l, but \lOuld diminish the damages considerably, with aver- <br />age annual project flood damages reduced to $6,500. <br /> <br />13 <br />