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<br />.... <br /> <br />stream effected. In the case of larger and more general storms, <br /> <br /> <br />however, these produce flood discharges on many tributaries which <br /> <br /> <br />combine on the river's main stern to cause widespread damage. <br /> <br /> <br />a. Arkansas River Valley.- The Arkansas River valley is <br /> <br /> <br />subject to flooding from two major contributing areas, one of which <br /> <br /> <br />lies between John Martin Dam and the Colorado-Kansas State line, and <br /> <br /> <br />the other between Dodge City and Great Bend. From the State line to <br /> <br /> <br />the mouth of the Pawnee River near Larned, flood peaks are generally <br /> <br />~;>L;Hr....."} S).- 5~ 7o..j:,lk" z. <br />reduced by valley storage. Plate A-2-shows the attenuat~on of peak <br /> <br /> <br />flows for various historic floods progressing down the Arkansas valley. <br /> <br /> <br />b. Lamar, Colorado.- Lamar is partially protected from <br /> <br /> <br />floods on Willow Creek by a levee and channel constructed by local <br /> <br /> <br />interests to divert flow around the city's eastern edge. In early <br /> <br /> <br />settlement times, the creek's natural outfall to the Arkansas River <br /> <br /> <br />passed directly through the area now occupied by Lamar as a modern- <br /> <br /> <br />day city. Large floods such as experienced in June 1965 overtop the <br /> <br /> <br />levee-channel system and return to the old natural watercourse directly <br /> <br /> <br />through Lamar. The business district and a large part of the city's <br /> <br /> <br />residential area south of the AT&SF railroad are vulnerable to flood- <br /> <br />'. <br /> <br />ing from Willow Creek. North of the AT&SF, the area is subjected to <br /> <br /> <br />Arkansas River overflows. Tributaries that directly influence peak <br /> <br /> <br />flows on the Arkansas at Lamar include Caddoa, Mud, and Dry Creeks. <br /> <br /> <br />c. Granada, Colorado.- Wolf Creek emerges from a sand hill <br /> <br /> <br />area about 1 mile west of Granada and turns southeast (from a north- <br /> <br /> <br />erly course) to approach the city along the AT&SF railroad. At <br /> <br /> <br />Granada's outskirts, the creek again turns abruptly to the northeast <br /> <br /> <br />and flows under the railroad bridge. A levee and channel constructed <br /> <br /> <br />by local interests helps to direct small flows beneath the railroad <br /> <br /> <br />bridge, but the system is ineffective against large magnitude floods. <br /> <br /> <br />Past floods that have breached the levee and entered the community <br /> <br /> <br />occurred in July 1935, June 1949, May 1951, May 1958, and June 1965. <br /> <br /> <br />A flood in May 1955 damaged the levees and agricultural land. The <br /> <br /> <br />1965 flood forced the entire community to evacuate to the higher land <br /> <br /> <br />south of Granada. <br /> <br />A-9 <br /> <br />.~-''--- <br />