Flood Insurance Rate Map
August 19, 2008 Flood Insurance Rate Map
Federal Emergency Management Agency
New Flood Insurance Rate Map (FIRM):
- Adoption required by Federal Emergency Management Agency and
Illinois Department of Natural Resources to remain eligible in
National Flood Insurance Program (subsidized flood insurance)
- Determines flood insurance rates; 100-year (1% probability
flood) flood plain is the regulatory flood plain
Part of Cook County Map Modernization Program:
- Reflects improved topographic (ground) information from new
technology – Light Detection and Ranging (LIDAR) system and Global
Positioning System equipment
- Vertical precision is 0.6’ (approximately 7.5")
- Hydrologic and Hydraulic (H&H) information unchanged along the
Des Plaines River (100-year flood elevation remains the same)
Previous FIRM:
- November 6, 2000 map:
- H&H from 1999 Army Corps of Engineers Des Plaines River
Feasibility Study
- Topography from 1980 Flood Insurance Study (1981 FIRM)
Letters of Map Change (LOMC):
- Letter of Map Amendment (LOMA):
o Corrects errors in the mapping
o Requires Elevation Certificate
Lowest finished grade around structure must be higher
than 100-year flood plain elevation
- Letter of Map Revision (LOMR):
o Issued as a result of approved construction project
o Lowest finished floor (including basement) must be at least
one foot above 100-year flood plain elevation
o Conditional Letter of Map Revision (CLOMR) must be issued
prior to construction; once as-built information is verified a
LOMR can be issued
Building Requirements:
Existing Structures:
Vertical additions permitted as long as improvement does not
exceed 50% of the existing building value at the time of permit.
Horizontal additions are permitted as long as requirements for
new construction are met
New Construction:
- Lowest floor (including basement) must be at least one foot
higher than 100-year elevation
- 150% hydraulically equivalent compensatory storage required to
compensate for lost flood storage
- Detached garages are permitted at-grade without compensatory
storage as long as the foundation walls are extended one foot
above the flood plain elevation
- Above-ground pools require compensatory storage
Flood Control Projects:
Des Plaines River, Phase I, Army Corps of Engineers
- Big Bend Lake Reservoir (under design)
- Buffalo Creek Reservoir (under preliminary design)
- North Fork Mill Creek Reservoir (planning stage)
- Van Patten Woods Lateral Storage (planning stage)
Des Plaines River, Phase II, Army Corps of Engineers
- Expands on Phase I flood damage reduction projects
- Includes environmental protection, restoration, water quality
and recreation benefits
- 33 tributary creeks under study
Metropolitan Water Reclamation District of Greater Chicago
Responsible for storm water management in Cook County
Preparing county-wide Watershed Management Ordinance
o Likely to be more restrictive (i.e., 2-foot finished floor
elevation above 100-year flood plain
o Includes regulation on water quality, quantity, erosion,
wetlands, and riparian environments
Preparing watershed plans that will lead to flood control
improvements
Additional
Information from FEMA.gov.
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Des Plaines, IL 60016
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