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<br />1.0 Introduction <br /> <br />Intense localized thunderstorms occurred in the area north-east <br />of Greeley on Saturday, July 29, 1989 between 3:00 p.m. and ______ <br />p.m. and on Sunday, July 30, 1989 between 11:00 a.m. and __~__ <br />p.m. The resultant flooding on south flowing tributaries to the <br />South Platte River in this area caused relatively minor damage to <br />personal residential property due to sparse development. <br />However, damage to farms, county roads, and irrigation ditches <br />was extensive. Rainfall fell in excess of the 100--year <br />precipation in some basins~ <br /> <br />2.0 Drainage Basins <br /> <br />Eaton Draw, Sand Creek, Lone Tt-ee Creek, Willow Creek, Owl Creek, <br />and Crow Creek headwate,- in the nOi-thern Colorado plains region <br />of the South Platte River drainage basin. <br /> <br />DRAINAGE BASIN CHARACTERISTICS <br /> <br />-------------------------------------------------------------------- <br /> <br />stream <br /> <br />Area <br />sq mi <br /> <br />Max Basin <br />Elevation <br /> <br />--------------------------------------------- <br /> <br />Eaton Draw at Eaton <br />Eaton Draw at mouth <br /> <br />23.2 <br />42.1 <br /> <br />Sand Creek at mouth <br /> <br />'\(, <br />\,,+, <br />\'t' <br /> <br />Lone Tree Creek M, mou, tl1 ~ <br />&l /~I.Q, 1/}N'1_ J,.t, 'k.- m <br />" TL<J. ;1.rt-, <br />Willow Creek at a on~' <br /> <br />Willow Creek at mouth <br /> <br />13.0 <br /> <br />5,000 <br /> <br />Owl Creek at Gill <br /> <br />~' Unamed Tributary to, C,'ow C,-eek <br />/' <br />Crow Creek at Barn~s~ille <br /> <br />near Barnrsville <br /> <br />------------------------------------------------------------------- <br /> <br />f . )c. \... rGo W 6111. OH~ (N <br />A-.. .tw':f.""'~.tv"'-1 " ......-' lSQ..l v'D \;t(V VI' vrtt)., (,'-' <br />~tJo,).. Vt~~~ <br />n~ ~ ~) t,-r6 ~ <br />~1Oloy CAM!) <br />f I~ Lo.t~ ~ <br /> <br />Ii <br />