FLOOD11062 - Laserfiche WebLink

Home Browse Search

Federal Emergency Managerrlent Agency Washington, D.C. 20472 FEB 252003 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 02-08-491P The Honorable Melanie Worley Chairperson, Douglas County Board of Commissioners 1 00 Third Street Castle Rock, CO 80104 Community: Douglas County, CO Community No.: 080049 Panel Affected: 0090 C Effective Date of J UN 2 5 2003 This Revision: 102-I-A-C Dear Ms. Worley: This responds to a request that the Federal Emergency Management Agency (FEMA) revise the effective Flood Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) report for your community in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulllLtions. In a letter dated August 14,2002, Mr, Tom Williams, P.E., Stormwater Utility Manager, Department of Public Works, Town of Parker, requested that FEMA revise the FIRM and FIS report to show the effects of revised hydrologic and hydraulic analyses, more detailed topographic information, and channel modifications associated with the Canterberry Crossing (Villages of Parker) development along Sulphur Gulch from approximately 1,580 feet downstream of Canter berry Parkway to approximately 930 feet upstream of Canterberry Trail. The revision was extended upstream into the unincorporated areas of Douglas County to approximately 1,130 feet upstream of County Road 9 (CR9) as the upstream llimit of detailed study. The channel modifications included construction of two new culvert stream crossings at Canterberry Parkway and Canterberry Trail. All data required to complete our review of this request were submitted with letlters from Mr. Brad Robenstein, P.E., Drainage and Flood Control Engineer, Public Works Department, Douglas County; P.E., Project Engineer, EMK Consultants, Inc.; and Mr. Williams. We have completed our review of the submitted data and the flood data shown on the effective FIRM and in the effective FIS report. We have revised the FIRM and FIS report to modify the elevations and floodplain and floodway boundary delineations of the flood having a I-percent ehance of being equaled or exceeded in any given year (base flood) along Sulphur Gulch in your community from approximately 930 feet upstream of Canterberry Trail to the upstream limit of detailed study, which is approximately 1,130 feet upstream ofCR9. As a result of the modifications, the Base Flood Elevations (BFEs) for Sulphur Gulch and the widths of the Special Flood Hazard Area (SFHA), the ar(~a that would be inundated by the base flood, and the regulatory floodway increased in some areas and decreased in other areas. The modifications are shown on the enclosed annotated copies of FIRM Panel 0090 C, Profile