 FEMA
Digital Flood Insurance Rate Maps 2011 Schedule Revision for
Update
The Southwest Florida Water
Management District (SWFWMD), Federal Emergency Management
Agency (FEMA) and Sarasota County (incorporated and
unincorporated areas) a/k/a Cooperative Technical Partners (CTP),
have revised the Flood Map Update schedule.
As of April 2011, the SWFWMD Floodplain Map Viewer link to
www.watermatters.org has draft GIS data from the following
Watershed areas: Hudson Bayou, Whitaker, Isle of Venice, Roberts
Bay, Alligator Creek and the City of North Port.
Benefits
Add details to reflect infra-structure and development in
our area over the last 15-27 years.
Use updated topography that captures contours and depression
depths.
With aerial photography, identify streets and parcels for
more accurate interpretations.
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THE MAP ADOPTION TIMELINE |
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Close
Data Collection |
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Spring
2012* |
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In October 2009, the Cooperative Technical Partners (CTP) received LiDAR product
from the State of Florida; CTP completes Quality Assurance by August 2011*; CTP
conducts public meetings, SWFWMD collects comments from GIS map products
(Floodplain Map Viewer) September 2011*
SWFWMD Floodplain Map Viewer at www.watermatters.org |
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Preliminary D-FIRM |
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Summer 2012* |
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SWFWMD provides a contractor with all data collected. Contractor produces a
Preliminary D-FIRM. CTP staff from all jurisdictions finds product reasonable
for public review. |
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90
Day Appeal and Protest |
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Fall 2012* |
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CTP staff presents
Preliminary D-FIRM to local officials to approve and
schedule a coordinated jurisdictional 90 Day Appeal and
Protest Period. Individual notifications occur, public
meetings and assistance to comment (Protest) and/or
Appeal (scientific dispute).
Preliminary D-FIRM product will be made available on TBD
website. |
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FEMA
and Local Adoptions |
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Spring 2013* |
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Any Appeals and/or Protests received are investigated for validity by FEMA to
change the Preliminary D-FIRM. FEMA approves a Final Digital Flood Insurance
Rate Map and accompanying Flood Insurance Study. Upon adoption all federal,
state and local regulations are applicable. |
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*Dates subject to change. |
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LiDAR
Light Detection and Ranging is a remote sensing system used to
collect topographic data. The National Oceanic and Atmospheric
Administration (NOAA) and NASA use this system to document
changes along shorelines. Data collected with aircraft mounted
lasers that are capable of recording elevation measurements at a
rate of 2,000 to 5,000 pulses per second and have a vertical
precision of 15 centimeters (six inches).
ICPR
Interconnected Channel and Pond Routing modeling used by
Sarasota County staff. This modeling software produces
surface water runoff hydrographs generated for basins then
assign nodes in a drainage network. Nodes are used to represent
ponds and specific locations, i.e., along channels, streams,
rivers and junction in pipe systems. Stages are calculated at
each of the nodes and links, flow rates are then calculated for
links based on stages at nodes. Sarasota County Surface Water
staff analyze, maintain and update these models on a daily
basis.
If it rains – it can flood.
Everyone is in a flood zone the question is what is the risk?
Has it been determined – waiting for a study?
 Visit
www.FloodSmart.gov find your
flood zone, calculate your premium or help you plan.
Detailed Flood
Studies
Sarasota County experienced a severe rainfall flood event in
1992. 60% of the reported flooded structures were
not in a High Risk area on the FEMA FIRM. Elected officials
wanted the flood risks updated. Since that time, twenty-one
studies have been conducted and adopted locally and used for
local development and planning decision. Upon adoption the
studies were modeled (ICPR) and then updated regularly to
reflect completed stormwater projects and development.
Automated Rain
Monitoring Sensors (ARMS)
Sarasota County has fifty-four rainfall
sensors. This real-time data and historical rainfall
information can be viewed on-line:
http://arms.co.sarasota.fl.us/Scripts/DWReports/
National Flood
Insurance Program (NFIP)
Sarasota County adopted the NFIP regulations in 1971 and
received the first Flood Risks Maps in 1972.
Community
Rating System (CRS)
Flood insurance is another tool to mitigate flood loss and
assist a community’s speedy recovery. Under the CRS, flood insurance
premium rates are adjusted to reflect the reduced flood risk
resulting from Best Management Practices.
Sarasota
County has attained a Class 5 Rating in 2007 = $5M-$6.3M annual
discounts/ $11B property protection. To learn more about
CRS:
http://www.fema.gov/business/nfip/crs.shtm
Federal flood
mitigation grant fact sheet
http://www.fema.gov/library/viewRecord.do?id=3648
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FLOOD RISK |
FLOOD ZONE |
FLOOD TYPE |
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High* |
AE, A, AH or AO |
Riverine, overbank,
flash, subsidence |
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High* |
VE or V |
Velocity, storm
surge/wave action |
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Moderate |
B, X Shaded |
Outside of high risk |
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Low |
C, X |
Not high or moderate or
undetermined |
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*Mandatory Insurance
Requirement Applicable |
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Revision: Revision No. 3, March 1, 2011 CRS Program Sarasota
County 941-861-5000 |
