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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November 18, 1985

Honorable Clifford Hartman
Mayor, City of Alamosa
Box 419
Alamosa, CO 81101

Dear Mayor Hartmanz

This is a follow-up to our letter to you, dated September 19, 1985
regarding the City of Alamosa's participation in the National
Flood Insurance Program (NFIP). In particular, the letter
discussed the possible floodway encroachment along the Rio Grande
River at the Riverwood Estates (Anderson) Subdivision, and
requested flood plain development permit data for the Riverwood
Estates Subdivision. Also, our office has since learned of
mitigative measures undertaken by the City.

In order to complete our review of this floodway issue, we are
still in need of the flood plain development permit data, and all
technical data developed for the Riverwood &states Subdivision,
inclUding technical data developed for the mitigative measures
undertaken. In addition, until this issue has been resolved and
in order to assure the City's continued participation in the HPIP,
we are requesting a moratorium on all construction and issuance of
building permits for the Riverwood Estates Subdivision.

Further, the Flood Insurance Rate Haps (FIRMS) are the official
document of the City for flood insurance and flood plain
management purposes and remain so until the mapa are officially
changed by FEMA. In order for PEMA to change the maps, it is the
responSibility of the City as a participant in the NPIP, to submit
to FBKA tor approval, technical data indicating flood risks as
they currently exist, including any physical chang.. such as
Channelization, construction of levees, and fill in the floodway.
Procedures for map revisions and floodway revisions are enclosed.

Lastly, in the event levees are constructed, tbey .uat be in
co.pllance with PERA levee criteria. PIKA's criteria ~equire8
levees be structurally sound, adequately ..intained, and bave a
.iniaua levee freeboard of three feet abOVe tbe base (lOO-year)
flood elevation. . Levee construction 1. outllDed in the enclosed
PBKA-Interim Levee Policy. referencing tbe .intaw. requlre..nts.
AlSO, PBKA recommends the Corps of Engineers ..nual -DeSign and
Construction of Levees. EM 1110-2-1913 for basic principles.

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