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COLORADO <br />Division of Water Resources <br />Department of Natural Resources <br />Dam Safety Branch <br />Dam Failure Forensic Investigation Report <br />TO: File - Havana Street Dam, DAMID 020615 <br />FROM: Jeremy Franz, Design Review Engineer <br />Ryan Schoolmeesters, Dam Safety Engineer <br />Erin Gleason, Dam Safety Engineer <br />John Batka, Dam Safety Engineer <br />CC: Bill McCormick, Chief - Dam Safety Branch <br />DATE: 18 December 2014 <br />RE: Havana Street Dam Failure - 12 September 2013 <br />Table of Contents <br />1.0 Scope and Purpose ................................................. ............................... 2 <br />2.0 Methodology .......................................................... ..............................2 <br />3.0 Dam Description .................................................... ............................... 3 <br />4.0 Failure Event ........................................................ ............................... 5 <br />5.0 Emergency Response ............................................... ............................... 8 <br />6.0 Field Investigation .................................................. ............................... 9 <br />7.0 Analysis and Results ............................................... ............................... 10 <br />7.1 Rainfall Analysis ................................................... ............................... 10 <br />7.2 Rainfall Runoff Modeling .......................................... ............................... 13 <br />7.3 Dam Breach Modeling ............................................. ............................... 14 <br />7.4 Analysis of Incremental Impacts ................................. ............................... 16 <br />8.0 Conclusions ......................................................... ............................... 19 <br />9.0 Bibliography .......................................................... .............................20 <br />10.0 Acknowledgements ................................................ ............................... 20 <br />11.0 Appendices ........................................................... .............................21 <br />Appendix A - Plans for 2013 Construction of Improvements to Havana Street Dam .............. A <br />Appendix B - RMA Staff Account of September 2013 Events .......... ............................... B <br />Appendix C - Field Investigation Photos .................................. ............................... C <br />Appendix D - Field Investigation Notes ................................... ............................... D <br />Appendix E - September 8 -17 2013, 5 minute precipitation data for Irondale Gulch provided by <br />Applied Weather Associates, Inc ................................. ............................... E <br />Appendix F - NOAA Atlas 14 Precipitation Frequency Estimates for Irondale Gulch Basin....... F <br />Appendix G - Hydrologic Breach Modeling with HEC -HMS Supporting Documentation ........... G <br />w F coto <br />1313 Sherman St, Rm 821, Denver, CO 80203 P 303.866.3581 F 303.866.3589 w .water. state. co. us I <br />ye <br />O <br />x + <br />rt