Laserfiche WebLink
<br />CONTENTS <br /> <br />Page <br /> <br />Abstract---------------------------------------------------------------- 1 <br />Introduction------------------------------------------------------------ 3 <br />Acknowledgments---------------------------------------------------- 5 <br />The setting-------------------------------------------------------- 6 <br />History of the dams----------------------------------------------------- 8 <br />Lawn Lake dam------------------------------------------------------ 8 <br />Possible causes of failure------------------------------------ 9 <br />Cause of failure---------------------------------------------- 12 <br />Cascade Lake dam--------------------------------------------------- 13 <br />Cause of failure---------------------------------------------- 15 <br />Hydrologic analysis of the flood---------------------------------------- 15 <br />Flood data--------------------------------------------------------- 16 <br />Station descriptions and streamflow data---------------------- 16 <br />Peak stages and discharges------------------------------------ 19 <br />Volume-------------------------------------------------------- 21 <br />Velocities, depths, widths, and areas------------------------- 26 <br />Flood profiles and boundarie5--------------------------------- 26 <br />Flood frequency----------------------------------------------- 26 <br />Traveltime---------------------------------------------------- 30 <br />Description of flood-wave characteri5tics------------------------------- 36 <br />Roaring River: Lawn Lake dam to Horseshoe Falls------------------- 36 <br />Fall River: Horseshoe Falls to Cascade Lake dam------------------- 39 <br />Fall River: Cascade Lake dam to Estes Park powerplant------------- 41 <br />Fall River and Big Thompson River: Estes Park powerplant <br />to Lake Estes---------------------------------------------------- 41 <br />Geomorphic effects of the flood----------------------------------------- 46 <br />Roaring River: Lawn Lake dam to Horseshoe Falls------------------- 46 <br />Roaring River alluvial fan----------------------------------------- 54 <br />Fall River: Horseshoe Falls to Cascade Lake dam------------------- 57 <br />Fall River: Cascade Lake dam to Estes Park powerplant------------- 60 <br />Catastrophic flood feature5----------------------------------- 61 <br />Fall River and Big Thompson River: Estes Park powerplant to <br />Lake Estes------------------------------------------------------- 64 <br />Sediment in Lake Este5--------------------------------------------- 65 <br />Dam-break modeling------------------------------------------------------ 65 <br />Dam-break model---------------------------------------------------- 66 <br />Data requirements and assumptions---------------------------------- 66 <br />Model calibration-------------------------------------------------- 69 <br />Model simulations-------------------------------------------------- 70 <br />Variations of Lawn Lake dam breach width and timing----------- 72 <br />Effects of Cascade Lake dam failure--------------------------- 77 <br />Discussion of results---------------------------------------------- 77 <br />The flood aftermath----------------------------------------------------- 78 <br />The human element-------------------------------------------------- 79 <br />The damage--------------------------------------------------------- 80 <br />Summary and conclusions------------------------------------------------- 84 <br />Gaging-station and miscellaneous-site data------------------------------ 88 <br />References-------------------------------------------------------------- 91 <br />Supplemental cross-section data----------------------------------------- 93 <br /> <br />iii <br />