Future Floodplains
Two Floodways
Higher Standards
CRS
Bill Tingle, CFM, PG
Floodplain
Administrator
Future Land Use Floodplain
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Pilot Study on Two Drainage
Basins
Future land use flood heights
about 2.4’ on average higher
than excising landuse flood
levels.
Some as much a 9.0’ Higher
Two floodplains??
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FEMA Floodplain
„ 100-year flood
„ Primarily used to rate flood insurance
policies
Community or “Ultimate” Floodplain
„ 100-year flood
„ Full Buildout in the watershed
„ Used adopted District Plans
Two Floodways
FEMA Floodway – based on 0.5’ Surcharge
Community Encroachment Area – based on
0.1’ Surcharge
Old 1.0’ Floodway – 50% Floodway / 50%
Flood Fringe
0.1’ Floodway - 75% Floodway / 25% Fringe
FEMA Floodplain
(Existing Conditions)
Community
Encroachment Area
(0.1’ Floodway))
FEMA Floodway
(0.5’Floodway)
“Community” Floodplain
(Future Conditions)
Higher Standards
Higher Standards Pre- 2007
Ordinance Revisions
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Future Conditions Floodplain
0.1’ (Community) and 0.5’ (FEMA) Floodways
Cumulative Substantial Improvement
1’-2’ Freeboards
Replacement Mobile Homes above BFE+1’
Critical Facilities above 500-year
Higher Standards
2007 Modifications
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2 types Floodplain Development Permits
Permit Time Limits
Flood Increases on Existing Buildings
Floodplain Fill Certification
Levee Requirements
Dry Land Access to Buildings During a Flood
Parking Lot Elevation Requirements
Substantial Improvements
Floodplain Development
Permits
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Overview
„ FEMA requires Floodplain
Development Permits
„ Can be administratively
burdensome
„ For all “Development” in
the floodplain
Floodplain Development
Permits
“Development” means any man-made
change to improved or unimproved real
estate, including, but not limited to, buildings or
other structures, mining, dredging, filling,
grading, paving, excavation or drilling
operations, or storage of equipment or
materials.
Floodplain Development
Permits
The Floodplain Administrator shall perform, but not
be limited to, the following duties:
“Review all floodplain development
applications and issue permits for all
proposed development within
Special Flood Hazard Areas to assure that
the requirements of this ordinance have
been satisfied.”
Floodplain Development
Permits
Allow for two types of permits:
General Floodplain Development Permit (GFDP) to
"Permit" certain man-made activities, no impact on flood
heights
„ Individual Floodplain Development Permit (IFDP) required
for all other man-made activities, potential to impact flood
heights
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Benefits:
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Reduce/eliminate paperwork and permitting time
FEMA / Model Ordinance compliant
Drainage System Maintenance
Permit Time Limits
Project must begin construction within two
years Or a new permit is required
Flood Increases on Existing
Buildings
Clearly defined in ordinance
„ Development in FEMA Floodway – NO
Increase on buildings (per 44 cfr)
„ Development in Community
Encroachment Area – Increase up to
0.1’ but must obtain variance if on
building.
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Flood Increases on Existing
Buildings
Community
Encroachment
Area
Existing Floodprone
Bldgs
Proposed
Building
Floodplain Fill
Certification
Projects with fill in the Community
Encroachment Area
„ Require a “As-built” map showing
the elevations of the ground after
work is finished
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Benefits
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Reduce the instances of fill or
structures being mistakenly placed
within the Community
Encroachment Area
Levee Requirements
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Overview
Levees are earthen
berms or man-made
walls
„ Built along a creek bank
to protect an area from
flooding
„ Require monitoring and
maintenance
„ All levees have a limited
lifespan
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Levee Requirements
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Conditions for Approval:
Levee location
„ Type of improvements the levee is
designed to protect
„ Notification of surrounding property
owners
„ Levee maintenance requirements
„ Current floodplain lines do not
change
„ No community maintenance of private
levees
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Levee Requirements
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Benefits
Greater restrict the location of
levees in the floodplain (public
and private)
„ Provide awareness of the
function and limitations of
levees
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Access to buildings during
flood
Dryland Access -Dryland Access means a gravel, paved or
concrete access route, at least 12’ wide, which is above
the Community Base Flood Elevation and connects an
Habitable Building to a Dry Public Street.
Dryland Access – Exemptions
If the property does not have
access to a dry public street,
exemptions apply to:
-Substantially Improved buildings
anywhere within the Floodplain
-New buildings outside the
Community Encroachment Area
Driveway must connect to highest
point of street on property
-Driveway must be no lower than
street
Dryland Access – Whitehall Retail
Gravel Drive – 12’ Wide
Dryland Access
Benefits:
ƒAssist emergency
response vehicles in
reaching flood prone
buildings
ƒOccupants can more
safely exit the building
during a flood
Parking Lot Requirements
New or substantially improved
non-single family buildings
„ Water depths no more than six
inches during a flood (future
conditions)
„ Required for all parking areas
„ Variance is available
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Flood Impacts on Parking Lots
Community Base Flood Level
FEMA Base Flood Level
Compliant Elevated
Building Floor
Cumulative Substantial
Improvements
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25% “improvements” within 10 year period
New Construction - construction of a replacement
structure commenced after total demolition, or
renovation/rehabilitation of an existing structure that
results in the partial or complete removal of 2 external
walls and has a total cost equal to or exceeding 50 percent
of the market value of the structure
“In Between” Floodplain
Structures
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600 Buildings with Floor above FEMA BFE +1’ but
Below Community BFE +1’
Substantial Improvement Problem
City Council Compromise
OK if Floor above FEMA +1’, but….
“In Between” Floodplain
Structures
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Must Record Affidavit on Deed that States
Acknowledgment of exemption to not meet local
ordinance requirements
„ There is potential for flooding in the future
„ Flood insurance may be required in the future
„ FEMA Substantial Improvements may apply in future
„ There will be no local matching flood mitigation funds
in the future for this property.
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Charlotte-Mecklenburg CRS
City of Charlotte - Class 5
Mecklenburg County - Class 6
Town of Pineville - Class 6
Save Policy Holders
Approximately $160,000 on
Annual Premiums
How Did We Obtain Class 5??
1. Higher Standards
2. Drainage System Maintenance
3. Acquisition & Relocation
4. Flood Data Maintenance
5. Open Space
6. Outreach Projects
7. Flood Warning
8. Map Information
9. Elevation Certificates
10.Additional Flood Data
11.Floodplain Management Planning
Higher Standards
• 1’-
2’ Freeboard
•Cumulative Substantial Improvement,
•Critical Facilities outside 500-year
•CFMs on Staff
•Natural Beneficial Functions (Water Quality Buffers, etc)
Drainage System Maintenance
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Storm Water Operations Division
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Blockage Removal
State Stream Dumping Law
Encroachments / Notices of Violation
Vegetation Management
Acquired parcel maintenance
Acquisition
Acquired 195 buildings resulting in
120 acres of open space
Before
After
Flood Data Maintenance
- Flood Map Layers in GIS
System
- Reference Mark Inventory
and Inspections
Open Space
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Hundreds of Acres of
Floodplains are permanent open
space
Many are deed restricted to
prevent future building.
Outreach Projects
•Direct Mailings to 5000+ Floodprone Property
Owners
•Flyers
•Radio Spots
•Billboards
Outreach Projects (Cont)
Exhibits at Realtors Expo and other events
Flood Warning
•Flood Threat Recognition
•Dissemination
•Storm Ready Community
Map Information
- Provide Flood Map Information to Inquirers
- Publicize Service
Elevation Certificates
- Require Completed
Elevation Certificate
for New Construction
- Maintain in
Database
- ECs for all Pre and
Post FIRM Buildings
- Available on Web
Additional Flood Data
- Future
Conditions Mapping
- Two Floodways
- Cooperating Technical Partner (CTP)
- Non-FEMA $ Funding $ for Mapping
Mitigation Planning
FEMA Required All-Hazards Plan Was Developed to
Maximize CRS Credits
Mitigation Planning
All
“The End”