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Standard ProJoct Flood Tho flood that may be expected from the most severe ~ombi~tion of meteorological ~nd hydrological conditions that ~re co~sldered reasonably characteristic of the g909r~phic~1 ~rA~ In whiCh the drainage basin Is located, excluding extreme I v rare ce<nbi~tions. Peak discharges for these floods are generally about 40 percent to 60 percent of the Probable Meximum Floods for the same basi nS. Su~h f !oods, as used by the Corps of Engineers, are Intended as pra~tlcnble expressions of the degree of protection that should be sought in the design of flood control works, the failure of Which might be disastrous. i i , TopofWaterwilY ThIs is the roof of the opening In a stream crossing through which water flows under norma! coooitlons. It Is the underside of the deck spen - s=etimes called "low st....1 ," the roof of a box culvert or the crown of an archod or circular culvert. I' :~,* tk "." i' ~ P " t.'<< I~~ >, I', , it ,. t 'n'" ','!j;; t< r.'ii " ~. " " AUTHORITY, ACKNOWLEDGEMENTS AND INTERPRETATION OF OATA This report has been prepared If'laccordancewiththe authority granted by Section 206 of the Flood Control Act of 196D (f>ubllc Law 86-6-45l as amended. . . . The assistance and cooperation of the Town of Morrison Intheprellmlnary phase of the report preparation Is appreciated. . . . This reporT presents the loc~1 flood situation 910n9 ~r Creek and Mount Vernon Creek ~t Morrison, Colorado. The Omah<l District of the Corps of Engineers "III provide Interpretation an d I imltad technIcal asslsteI>Ce In application of data presented hereln. 22