FLOOD10104

• County: Alamosa
• Community: Alamosa
• Stream Name: Rio Grande
• Basin: Rio Grande
• Title: Riverwood Estates Subdivision Rio Grande Floodway Evaluation
• Date: 4/3/1987
• Prepared For: Alamosa
• Prepared By: Muller Engineering Company, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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February 20, 1986

Mr. Greg Sparks, City Manager
City of Alamosa
P. o. Box 419
Alamosa, CO 81101

Dear Mr. Sparks:

Thank you for your letter dated December 19, 1985 responding to
our concerns regarding flood plain development and in particular,
the possible floodway encroachment at the Riverwood Estates
Subdivision. We appreciate your addressing the various flood
plain issues, however, we feel some clarification is necessary and
offer the following comments.

First, as a participant of the National Flood Insurance Program
(NFIP), the City adopted a flood plain ordinance on October 19,
1977 which provides standards for floodway development.
Section 5.3 of the ordinance entitled .Floodways. specifically
addresses floodway development. In addition, the City's ordinance
adopted the Flood Insurance Study (PIS), dated September 15, 1977,
including the Flood Insurance Rate Map (PIRMI and the Flood
Boundary and Floodway Map (PBFM). As shown on the City's FBFM
(copy enclosed), there is a floodway depicted along the Rio Grande
River. The FBFM, along with the Floodway Tables in the PIS,
should be used to regulate floodway development.

Second, there are various responsibilities of the City as a
participant of the NFIP. One responsibility of the City is to
formally adopt flood hazard data, including floodways, whenever
annexation occurs. Another responsibility of the City, as stated
in Title 44 Part 65, Section 65.3 of the Federal Register, is to
notify the Federal Emergency Management Agency (FEMA), in writing,
whenever the boundaries of the City have been modified by
annexation and to provide a copy of the City map suitable for
reproduction. As you know, a portion of the Rio Grande River was
annexed by the City as a result of the RiverwoodEstates
SlIbdivision annexation. A floodway exists along this area which
is shown on the County's FBPM (copy enclosed). Therefore, to be
in compliance with the NFIP, the City MUst adopt this floodvay.

Third, it is also the City's responsibility to prohibit
encroachments, including fill, new construction, sllbstantial