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<br /> <br />. <br /> <br /> <br />. <br /> <br />;". <br />I,:'. <br /> <br />'I <br />" - <br />J",p' <br />'. <br />;.<1." <br /> <br />. <br /> <br /> <br />, <br /> <br />Figure 3. ST. CHAALES RIVER BRIDGES <br />Top view is 1_25 Eost La~o bridge dt mil~ 13.33. <br />Bottom view is I~25 West Lane bridge at Mile 23.35. <br />18 <br /> <br /> <br />St. Charlae River during the yesrs 1921 through 1925. A gaging <br />station at the 21th Lene bridge produced continuous records of <br />streamflowe from 1942 through 1955. <br />Descriptive accounts of past floods in the Pueblo eroa, <br />as auailable in newspaper files end other historical documents, are <br />primeri~Y concerned with the larger aspects of flooding on the <br />Arkansas River or fountain Cresk. Publications of the U.S. Geo- <br />logIcal Survey end Colorado Wetsr Reoords were additionai souroes <br />ofinform<'!Uon. <br /> <br />Flood Stanes and Oischaroes <br />Peak discharges end flood crsst stegss elong ths St. <br />Charles River era typical of perennial streams of tha Southwestern <br />United States. Valley storege and high infiltration rates dimin- <br />ish discharges progressively as flows pess downstreem. floods on <br />the St. Charles River ere characterized b~ high pe.k flow9 of mod- <br />erately short duration, ranging from 8 to 2Q hours. <br />T.ble 4 lists gsge heights end discharges for the known <br />floods exceeding bankfull stege et stream gaging stetions which <br />were maintained within the study reach at ~pecified locations and <br />times. Table 5 lists the highest ten recorded flows in order of <br />magnitude since 1921. <br /> <br />flood Occurrencee <br /> <br />Most of the major flood-producin9 storms over the St. <br />Charles watershed occur during the summer months from May through <br />~ugust. Ouring this period, meS~9S of warm, moist eir from the <br />Gulf of Me~lco and cold, comparatively dry sir from the polar re- <br />gions combine ov~r th~ eres to Cause increased thunderstorm activity. <br />The a~ver~st ~torM~ often gener~te in the tranaltional periods of <br />lete spring end eerly foIl when poler eir intrusions era most in- <br /> <br />tensive. <br /> <br />Wlntst precipitation results when moisture-bearing oi~ <br /> <br />19 <br />