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

the FEMA flood maps in accordance with the standards established in Availability and Uses of
Digital Data section and Appendix E. Likewise, CWCB would be interested in FEMA funding
to support such maintenance in the 57 counties outside the UDFCD boundaries and within those
portions of 5 UDFCD counties that do not lie within the boundaries of the District.

For maintenance levels 1 through 3, updated flood hazards will be catalogued and tracked
electronically in accordance with the procedures outlined in the Availability and Uses of Digital
Data section and Appendix E. Flood hazards within the UDFCD will be catalogued and tracked
internally.

3.1.6 Quality Assurance I Quality Control

Quality assurance (QA) and quality control (QC) is an important component of producing
accurate flood hazard data. Currently the CWCB is coordinating the production of flood hazard
studies that have two review components. Data that is generated by CWCB contractors are
reviewed internally through established quality control procedures. This same data is then
reviewed in part by FEMA's national contractor, Michael BakerJr. All flood hazard data will be
subject to compliance with the CWCB's Rules and Regulations for Floodplains.

At this time the CWCB feels that this two-phased review process is adequate for the production
of flood hazard maps for Colorado. At the same time, there is a realization that the scope of the
projects that have been produced thus far will expand in the future (to include new hydrologic
and hydraulic studies), and that the role that FEMA asks Michael Baker Jr. to fulfill is currently
under negotiation. Due to these potential changes, the QNQC procedures may need to be
modified in the future to redefine the specific roles of the study partners such as:

. Increased or decreased reliance on Michael Baker Jr.

. Level of internal review by the CWCB

. Independent review from an additional CWCB engineering consultant

. Compliance with the CWCB Rules and Regulations for Floodplains

The need to modify our QNQC procedures will be evaluated on a study-by-study basis and this
Plan will be updated in the future to reflect any changes that may occur. Additionally, in
anticipation of potential changes we have included independent QNQC into our cost estimation
template presented in Appendix D to assist with future planning efforts.

3.1.7 Multi-Hazard Data

The CWCB has identified several types of hazard information throughout Colorado that would
be potentially available for incorporation into a statewide multi-hazard mapping effort. It must
be understood that all of this information is not necessarily available, in a digital or other format,
for public distribution; however, the Map Modernization effort will support the development of
multi-hazard data and build a framework to incorporate and store the data as it becomes available
in the future. Examples of other natural hazards affecting Colorado are:

. Debris flows and mudflows

. Dam break flooding

Colorado Business Case Plan - March 2004

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