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I I I I I I I I I I I I I I I I I I I FLOODPLAIN/FLOOD CONTROL PROJECT FEASIBILITY STUDY ON NORTH FORK FRENCHMAN CREEK AT PAOLI, COLORADO INTRODucnON The town of Paoli has experienced several large floods during the past 100 years. The most recent flood occurred July 30, 1989 as the result of high intensity rainfall in the upper one-half of the basin. According to a Colorado Water Conservation Board report, the July 30, 1989 event was the If100d-of-record" (Colorado ~Jater Conservation Board, 1990). This flood was used as the basis for conceptual design of the improvements discussed herein. Virtually all of Paoli' was inundated approximately as shown in Figure 1. The U.S. Hi ghway 6 and Burlington Northern roadway Irai 1 road embankments and deficient oridges acted as floodplain diversion structures which diverted almost 70 percent of th.e flood peak out of the North Fork, through town and into the South Fork of Frenchman Creek. The purpose of this report is to: 1. summarize floodplain information for Paoli, Colorado, 2. present three conceptual design alternatives, for a flood control project at Paoli, and 3. provide preliminary estimates of the cost of each alternative. Charles F. Leaf, P.E. and Forrest leaf, E.I.T, were project manager and desi gn engineers for the study. Leibert-McAtee & Associates, Inc. was subcontractor and performed the surveyinglmapping and graphics for the study. Mr. Larry Lang, Colorado Water Conservation Board, provided technical assistance to the town and overall project monitorin9. STUDY REACH The project area extends from County Road 23 at the downstream(east) end to County Road 19 at the upstream(west) end (Figure 1 ). The study reach includes the main North Fork channel and the existing overflow channel. The