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IIORTH FOP. Y. CF THE GU6'rdlSnr; RIVER <br />• FLOOD COUTRCL FLP.Pi <br />Assum,tions: <br />• Rechannelized river as constructed equals or exceeds Colorado State <br />Hieh~•iay Department design for gradient and channel ~~idth (personal <br />communication with Ray Bowen, Project Engineer, Colorado Departrent <br />of. Ili gh~,ays ) <br />• 100 year - 24 hour peak flow as determined by Colorado Fined Land <br />Reclamation Division computer model is 7,640 cfs (correspondence <br />with Candy Thompson, Colorado Mined Land Reclamation Division) <br />• Channel width - 80' (minimum) <br />• Channel gradient - .5% (average) <br />• • Channel side slopes - 1.OV:1.SH <br />• Solve channel depth by Mannings Equation for open channel flow: <br />1.486 a r 2/3 s } <br />Q n <br />• Channel bottom lined with large (+36") riprap material <br />• Use flow of 7,640 cfs as design 0 <br />• Use n of .035 <br />I1 <br />~J <br />