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CONTENTS (continued) Pa~e Obstructions to floodflows ......................... 24 Velocities of flow................................. 25 Rate of rise and duration of flooding .............. 25 Glossary of Terms .. .'............................................................ '"............ 26 TABLES Table I 2 3 Paqe 2 20 Dry Crepk Basin Vicinity Climatological Data ....... Dry Creek Basin Drainage Areas ..................... Flood Plain Reference Data, Dry Creek, Boulder Reservoir to St. Vraln Creek ..................... 29 PHOTOGRAPHS Flqure Pa~e 2 Dry Creek. Looking downstream from the Boulder Reservoir embankment............................. Dry Creek. Looking downstream at the Colorado and Southern Railroad (reference .polnt 16) from the northbound land of Colorado Highway 119 (reference point 14) ............................. 4 4 3 Dry Creek. Looking upstream from Colorado Highway 52 (reference point 43) .......................... Dry Creek. Looking downstream from Colorado Highway 52 (reference point 43) .................. Dry Creek. Looking upstream from North 79th Street (reference point 69) ...................... Dry Creek. Looking upstream from Nlwot Road (reference point 81) ............................. Dry Creek. Looking downstream from North 83rd Street (reference point 87) ...................... 7 5 4 5 5 6 6 6 7 II CONTENTS (continued) PHOTOGRAPHS (continued) Figure 8 9 ~ . 10 11 12 13 14 15 Paqe Dry Creek. Looking upstream from North 95th Street (reference po i nt 1111 ...................... 7 Dry Creek. Looking upstream from North 107th Street (reference point 129) ..................... 8 Dry Creek. Looking downstream from North 119th Street (reference point 151) ..................... Dry Creek. Looking upstream from the Boulder- Weld r~unty line (reference point 162) ........... 8 9 16 Dry Creek. Looking downstream from the Boulder- We I d County I I ne (reference po I nt 162) ........... Dry Creek flood of 3 August 1951. Floodwater passed over U. S. Highway 287 ..................... Dry Creek flood of 3 August 1951. Looking upstream from U.S. Highway 287 ................... Dry Creek flood of 3 August 1951. Looking across the Dry Creek flood plain along the Colorado and Southern Railroad upstream from Niwot ........ Dry Creek flood of 3 August 1951. Looking across the Dry Creek flood plain south of Nlwot ......... 17 9 16 16 17 PLATES Title Plate Number Bas i n Map .......... '" .. . .. .. .. .. .. .. '" .. . .. .. '".. .... '".. .. .. .. '" .. .. .. .. . .... .. .. .. '" '" ... 1 P I ate I ndex Map ..................................... 2 Flooded Areas ....................................... 3-13 Prof i I as ........................... '" .. '" .. .. .. .. .. '" .. .. .. .. .. .. .. .. .. .. .. .. '" .. . . . .. '" .. 14-27 Cross Sections ........................................ 28-33 Iii