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City of Canon City Fourmile Creek Floodplain Study Meeting Summary - August 4, 1998 Meeting Attendees: Bob Saulmon - Canon City Larry Lang - CWCB Tom Browning - CWCB Meeting Summary: . The NRCS completed a draft floodplain study for Fourmile Creek in 1996. The study begins at the confluence of the Arkansas River and terminates approximately 3 miles upstream of Highway 50. . A local engineer and other reviewers did not feel that the results of the study were accurate in the lower reach of the stream. Specifically, the right overbank area upstream ofHwy 50 had been physically changed by development. The study results were therefore not representative of existing conditions. Other concerns were expressed for the floodplain downstream ofHwy 50 as well. . A revised floodplain analysis is needed for the lower portion of the Fourmile Creek basin. The hydrology values and hydrology model from the NRCS study should be used. The hydrology will not be revised. . New topographic mapping is now available for the area just upstream of Hwy 50. This new mapping supersedes the old mapping (for that area) and should be integrated into the new study. . The floodplain analysis from the confluence area upstream to cross-section 310 needs to be revised based on more reasonable engineering assumptions and other changes. . Several issues/assumptions need to be addressed in the lower reach. For example, does the railroad embankment fail or divert water? Is the railroad bridge fully open or is it blocked with debris? Should the analysis begin at the railroad embankment or at the Arkansas River? . A floodway analysis should be provided for at least the lower reach of Fourmile Creek from the confluence up to Hwy 50. The new study will not include any.master pla.nning or mitigation strategies. The study will strictly focus on the floodplain and floodway analysis. A new report will be written to supplement/supersedc~ the NRCS report. . In order to complete the revised floodplain study, a consulting engineering firm from the Colorado Springs area will be retained by the City. The CWCB will assist the City by drafting a Scope of Work (SOW) and a cost estimate for the project. The SOW and cost estimate will be faxed to Bob by Friday, August 21. Bob should pre-select three consulting firms who may wish to submit proposals for the project.