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<br />, <br /> <br />CONTENTS <br /> <br />Introduction. . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . ~ . . . . . . . . . . . . <br /> <br />. <br /> <br />Cooperation and acknowledgements.......................... <br />Previous work............................................. <br />Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />St. VrainCreek and tributaries............................... <br />Above study area.. . . .. .' ..... . .. " .. .... " . . .. ...... " .... <br />In study area.. . . . .. " . ... .. .. .. ...... . . .. . .. ... .. .. .. .... <br />St. Vrain Creek............................. . . . . . . . . . . <br />Lefthand Creek.............................. . . . . . . . . . . <br />Data available...................... .... . . .. .. ... ... .... . .. ... <br />Magnitude and frequency of floods............................. <br />Flood history................................................. <br />St. Vrain Creek............................... ............ <br />Lefthand Creek.......................... . . . . . . . . . . . . . . . . . . <br />Inundation by St. Vrain and Lefthand Creeks................... <br />Methods of computation and assumptions.................... <br />St. Vrain Creek........................................... <br />Description of constrictions.......................... <br />Recent erosion........................................ <br />Flood profiles........................................ <br />Areas of inundation and depths of flooding............ <br />Velocities of flow.................................... <br />Effects of alterations................................ <br />Lefthand Creek...........................;................ <br />Sunnnary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />References cited.............................................. <br /> <br />ILLUSTRATIONS <br /> <br />Plate 1. <br /> 2. <br />Figure 1. <br /> 2. <br /> 3. <br />. <br /> <br />Page <br />1 <br />1 <br />2 <br />2 <br />3 <br />3 <br />4 <br />4 <br />5 <br />5 <br />6 <br />10 <br />11 <br />18 <br />18 <br />18 <br />19 <br />19 <br />20 <br />23 <br />23 <br />24 <br />24 <br />28 <br />29 <br />32 <br /> <br />Map of the Denver Mountain Area.............. ...... In pocket <br />Floods on St. Vrain and Lefthand Creeks <br />at Longmont, Colorado............................ In pocket <br />Composite frequency curve, foothills <br />and plains region................................ 33 <br />Frequency of annual floods, St. Vrain <br />Creek at U.S. Highway 287 at Longmont, <br />Colorado. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 <br />Frequency of annual floods, Lefthand <br />Creek at U.S. Highway 287 at Longmont, <br />Colorado. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 <br /> <br />