FLOOD04440

• County: Statewide
• Community: All
• Stream Name: All
• Basin: Statewide
• Title: Colorado Flood Map Modernization Business Case Plan - March 2004
• Date: 3/1/2004
• Prepared For: FEMA
• Prepared By: CWCB
• Floodplain - Doc Type: Floodplain Report/Masterplan

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SECTIINTHREE

Program Plan

3.1.5 Map Maintenance

The CWCB is currently contracting DFIRM production that includes printing of the preliminary
FIRMs and preparation of final Government Printing Office (GPO) deliverables. The CWCB is
committed to long-term, periodic maintenance of the state's DFIRMs, once they have been
produced. The CWCB believes that completion of needed hydrologic and hydraulic engineering
updates in counties that already have DFIRMs is just as important as completion of DFIRMs in
counties that have no DFIRMs. Without comprehensive and up-to-date flood hazard information
floodplain managers throughout Colorado will not have the tools necessary to practice sound
floodplain management. In addition to updating of outdated flood hazard data through the Site-
Specific Mapping program that was outlined above, CWCB believes that an adequate map
maintenance program is essential. Otherwise we may find ourselves in this situation in another
20 years. As map maintenance is a very broad topic we have identified the following areas that
the CWCB would have an int.:.rest in participating in some capacity:

Maintenance Levell - The CWCB is currently considering a more active role in Letters Of
Map Change (LOMC) that could potentially involve a State review fee as well as preparation of
Letter Of Map Revision (LOMR) documents for FEMA. The UDFCD is currently performing a
similar function for FEMA under a separate CTP agreement. Unfortunately, current staffing
levels are not adequate for the CWCB to take on an active role in LOMC review. However, with
FEMA assistance the CWCB would be willing to expand its LOMC responsibilities. The
progression of responsibilities the CWCB is interested in assuming is detailed below.

a) CWCB perform a cursory review of all LOMRs and CLOMRs

b) CWCB perform a detailed engineering review of all LOMRs and CLOMRs

c) CWCB perform a complete review of LOMRs and CLOMRs, including preparation of
the LOMR and CLOMR, including all relevant attachments.

The UDFCD is currently performing this function for FEMA within their jurisdiction under a
separate CTP agreement, and performing it in a very effective and efficient manner. For several
years UDFCD has demonstrated its ability to perform this work while saving FEMA money.
CWCB is very confident that the UDFCD program can be modeled to initiate similar activities
by the CWCB (for areas outside of the UDFCD's jurisdiction) for a successful statewide
program.

Maintenance Level 2 - If funding is available for a map revision within areas where revised
hydrologic and hydraulic analyses are required, a Physical Map Revision (PMR) will be
processed in a similar fashion to the Site-Specific map update section above. If FEMA funding is
not available for a PMR, but there is enough funding to prepare a LOMR, the CWCB will
perform the LOMR technical review through one of their engineering consultants and submit a
LOMR to FEMA for issuance. The CWCB believes that cost and performance of LOMC's
remain the responsibility of the development proponent and the communities that are affected by
the development. The CWCB will then file and store the LOMR information according to the
procedures outlined in the section below.

Maintenance Level 3 - UDFCD's FHADs are being updated on an as-needed basis through
funding provided by the UDFCD, based upon an internal analysis of the accuracy of existing
flood hazards. The UDFCD would be interested in FEMA funding to support the maintenance of

Colorado Business Case Plan - March 2004

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