Current through Reg. 49, No. 38; September 20, 2024
(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.
