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.. " The Honorable Edward J. Tagliente, Mayor June 5,1998 Page three 3) Consideration of a stream rehabilitation alternative We understand the desire to preserve the riparian environment that currently exists on the site and to minimize the effect of flood control construction, That was the reason given for the recommendation fo a side-spill channel. We believe, however, that a single channel would be preferable to two channels, In this particular location it is likely that historic farming and irrigation practices led to the reduction of the natural channel over the years. Most natural streams with a drainage area of the size of Godding Hollow's drainage area could be expected to have a larger channel than it does, because Mother Nature requires that channel capacity. We recommend that consideration be given to modifying the existing channel to reestablish more "natural" conditions. What we suggest is consideration of a stream rehabilitation project to enlarge the existing channel. Recommendations We believe that the following recommendations will go a long way toward addressing the comments above: I) Preparation of updated floodplain mal' The current floodplain map for Frederick does not show the town's present corporate limits or any floodplain information for the considerable area that has been annexed from Weld County into the Town of Frederick. It does not show the detailed floodplain information prepared by the applicant to represent the existing floodplain of Godding Hollow. We recommend that the town provide to FEMA the following information: a) An updated corporate limits map; b) A photocopied and spliced compilation of all of the FEMA floodplain information for Frederick and for Weld County within the 1998 corporate limits of Frederick, with the approximate corporate limits shown on the one map; and c) A Floodplain Information Report from Melody Homes providing a description of the hydrologic analysis with a table of calculated flood flows, a map showing the detailed "before" and "after" flood elevations in plan view, profiles showing the "before" and "after" flood elevations in profile view, and an overall floodplain map of the area around Crona Farm showing adjacent FEMA floodplain information that the new floodplain information will tie into, extending approximately 200 feet upstream and downstream of the site. The town should formally request of both FEMA and the Colorado Water Conservation Board that the Frederick FIS be updated using the information submitted by the town to FEMA. We believe that continued growth in southwestern Weld County necessitates up- to-date floodplain information for all affected local governments, For that reason, we have copied this letter to adjacent communities.