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In addition to survey information collected on each dam, cross sections including high water mark <br />surveys on the West Fork Little Thompson River and Deer Creek tributary drainage were obtained <br />to facilitate estimates of peak flows by indirect methods. Cross sections downstream of Meadow <br />Lake Dam were taken on September 25, 2013. Cross sections on the West Fork Little Thompson <br />River, Deer Creek and the Little Thompson River were taken on a follow -up visits in March and <br />April 2014. A cross section was also taken approximately 13 miles downstream of Meadow dam <br />on the Little Thompson River near the X Bar 7 Subdivision on March 4, 2014 during a field visit <br />arranged at the request of residents in that heavily impacted portion of the river. Figure 16 shows <br />the locations of cross section surveys and locations of indirect measurements by others utilized in <br />runoff model calibration. Detailed survey notes and indirect measurement information from all <br />site visits are included as Appendix B. <br />Figure 16 - Map showing locations of peak flows estimated using indirect methods. <br />An additional invaluable source of information came from interviews, video recordings, and digital <br />photographs provided by emergency personnel and the impacted residents. Recorded timelines, <br />narratives, and verbal stories all helped piece together significant events, especially those that <br />occurred between September 12 and 13, 2013. A summary and inventory of such information is <br />summarized in Appendix F. <br />10.4 Vertical Elevation Datum and Units <br />During reduction of the field survey data and development of input para meters for rainfall - runoff <br />modeling, it was necessary to establish a vertical elevation datum. The datum used for this <br />investigation was selected to enable the reader to relate elevations presented in this report to pre- <br />Report of the September 2013 Little Thompson River Flooding COLORADO <br />and Big Elk Meadows Dam Failures, June 2014 (Revised, Dec 2014) * Division of Water Resources <br />Page 19 of 48 b pirtm._nt or r.a,ur,r s,,sourc�, <br />DAM SAFETY BRANCH <br />