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Mr. Roger Schmidt <br /> September 2, 2016 <br /> Page 18 <br /> Topographic Mapping <br /> • Topographic mapping from data collected in 1995 (2 foot contours) <br /> • Topographic mapping from data collected in 2005 (2 foot contours) <br /> • Topographic mapping from data collected in 2013 (1 foot contours) <br /> • Topographic mapping from data collected in 2014 (1 foot contours) <br /> Other References <br /> • Chow, V.T., Open Channel Hydraulics, McGraw-Hill, 1959. <br /> WWE appreciates the opportunity to conduct this assessment regarding the nature and causes of <br /> erosion which occurred in June 2014 in the agricultural field owned by the City adjacent to the <br /> pipeline owned by the BIC which resulted in damage to the pipeline. This letter report has been <br /> prepared based on the information listed above, our review of the hydrology and hydraulics at the <br /> subject location, information gained from our field visits and discussions with City of Greeley <br /> personnel familiar with the site. If additional information becomes available, we may need to <br /> update our findings. <br /> Please feel free to contact us with any information regarding this report. <br /> Sincerely, <br /> WRIGHT WATER ENGINEERS, INC. <br /> By <br /> Ian Paton, P.E., CFM, CPESC <br /> President/ Senior Water Resources Engineer <br /> By <br /> Jonathan Jones, P.E., D.WRE <br /> Chief Executive Officer <br /> Cc: Ben Urbonas, P.E., D.WRE <br /> Attachment(s)/Enclosure(s): <br /> Figure 1 —General Location Map <br /> Figure 2—FEMA Flood Insurance Rate Map, Effective September 28, 1982 <br /> Figure 3—FEMA Flood Insurance Rate Map, Effective January 20, 2016 <br />