| (a) The RFPGs shall perform existing condition flood
risk analyses for the region comprised of:
(1) flood hazard analyses that determines location,
magnitude, and frequency of flooding;
(2) flood exposure analyses to identify who and what
might be harmed within the region; and
(3) vulnerability analyses to identify vulnerabilities
of communities and critical facilities.
(b) RFPGs shall perform existing condition flood hazard
analyses to determine the location and magnitude of both 1% annual
chance and 0.2% annual chance flood events as follows:
(1) collect data and conduct analyses sufficient to
characterize the existing conditions for the planning area;
(2) identify areas within each FPR where hydrologic
and hydraulic model results are already available and summarize the
information;
(3) utilize best available data, hydrologic and hydraulic
models for each area;
(4) identification of known flood-prone areas based
on location of hydrologic features, historic flooding, and local knowledge
obtained from outreach activities and public meetings;
(5) existing condition flood hazard analyses may consider
and include only those flood mitigation projects with dedicated construction
funding and scheduled for completion prior to adoption of the next
state flood plan;
(6) all analyses shall consider the location of existing
levees that do not meet FEMA accreditation as inundated by flooding
without those structures in place. Provisionally accredited structures
may be allowed to provide flood protection, unless best available
information demonstrates otherwise;
(7) the analyses shall consider existing dams when
data is available;
(8) a map showing areas as having an annual likelihood
of inundation greater than or equal to 1% and 0.2%, the areal extent
of this inundation, and the types of flooding for each area; and
(9) a map showing gaps in inundation boundary mapping
and identify known flood-prone areas based on location of hydrologic
features, historic flooding and/ or local knowledge.
(c) The RFPGs shall develop existing condition flood
exposure analyses, using the information identified in the flood hazard
analyses to identify who and what might be harmed within the region
for, at a minimum, both 1% annual chance and 0.2% annual chance flood
events. The analyses must include:
(1) analyses of existing development within the existing
condition floodplain and the associated flood hazard exposure;
(2) all existing condition flood exposure analyses
shall consider the population and property located in areas where
existing levees do not meet FEMA accreditation as inundated by flooding
without the levees in place. Provisionally accredited levees may be
allowed to provide flood protection, unless best available information
demonstrates otherwise;
(3) in accordance with guidance provided by the EA,
the existing condition flood exposure analyses shall consider available
datasets to estimate the potential flood hazard exposure including,
but not limited to:
(A) the number of residential properties and associated
population;
(B) the number of non-residential properties;
(C) other public infrastructure;
(D) major industrial and power generation facilities;
(E) number and types of critical facilities;
(F) number of roadway crossings;
(G) length of roadway segments; and
(H) agricultural area and value of crops exposed.
(4) the existing condition flood exposure analyses
shall include a qualitative description of expected loss of function,
which is the effect that a flood event could have on the function
of inundated structures (residential, commercial, industrial, public,
or others) and infrastructure, such as transportation, health and
human services, water supply, wastewater treatment, utilities, energy
generation, and emergency services.
(d) The RFPGs shall perform existing condition vulnerability
analyses to identify vulnerabilities of the communities and critical
facilities identified in subparagraphs (b) and (c) above, as follows:
(1) use relevant data and tools to identify the resilience
of communities located in flood-prone areas.
(2) consider and identify factors such as proximity
to a floodplain to identify vulnerability of critical facilities,
in accordance with EA guidance.
(e) All data produced as part of the existing condition
flood exposure analysis and the existing condition vulnerability analysis
shall be summarized in the RFP in accordance with guidance provided
by the EA. The data shall include:
(1) underlying flood event return frequency;
(2) type of flood risk;
(3) county;
(4) existing flood authority boundaries;
(5) social vulnerability indices for counties and census
tracts; and
(6) other categories as determined by RFPGs or to be
designated by the EA.
(f) The information developed by the RFPG under this
section shall be used to assist the RFPG establish priorities in subsequent
planning tasks, to identify areas that need FMEs, and to efficiently
deploy its resources.
|
