Sept 2013 NFHL Cross Sections

The National Flood Hazard Layer (NFHL) data incorporates all Digital Flood
Insurance Rate Map(DFIRM) databases published by FEMA, and any Letters Of Map
Revision (LOMRs) that have been issued against those databases since their
publication date. The DFIRM Database is the digital, geospatial version of the flood
hazard information shown on the published paper Flood Insurance Rate Maps(FIRMs).
The primary risk classifications used are the 1-percent-annual-chance flood event,
the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The NFHL
data are derived from Flood Insurance Studies (FISs), previously published Flood
Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs
and FIRMs, and new mapping data where available. The FISs and FIRMs are published by
the Federal Emergency Management Agency (FEMA). The specifications for the
horizontal control of DFIRM data are consistent with those required for mapping at a
scale of 1:12,000. The NFHL data contain layers in the Standard DFIRM datasets
except for S_Label_Pt and S_Label_Ld. The NFHL is available as State or US Territory
data sets. Each State or Territory data set consists of all DFIRMs and corresponding
LOMRs available on the publication date of the data set.