Transcript Marcellus_and_Floodplains_030811_final.ppt

Marcellus
Development and
Floodplains
BOGM Annual Training
2011
Presented by
Eric Jespersen/Brad Newlin
PAFPM
Floodplain
Beneficial Uses 1
• Natural Flood and Erosion
Control
• Water Quality Maintenance
• Groundwater Recharge
• Biological Productivity
Floodplain
Beneficial Uses 2
• Fish and Wildlife Habitats
• Harvest of Wild and Cultivated
Products
• Recreational Opportunities
• Economic Development, Scientific
Study & Outdoor Education
Initiatives
PA is Flood prone!
Disaster Declarations - 1965-2003
Orange = 3 or more
Red = 4 or more
Heavy Rains Happen!
NWS Flood Predictor
Green 1.2-2.4”/ 6 hours Teal 2.4-3.6”/ 6 hours
Practical
Reasons 1
Practical
Reasons 2
Pad site – Lycoming County
Practical
Reasons 3
What the river can carry…
Practical
Reasons 4
Bad targets for debris
Practical
Reasons 5
Wyalusing, Bradford County
Nice site
Practical
Reasons 6
• Oil and Gas regulations require
adherence to Floodplain
ordinances
– Despite the broad interpretation of
Chapter 78 and DEP control of
O&G permitting
Oil and Gas
Regulations
• Section 602 of the Oil and Gas Act
states, “Except with respect to
ordinances adopted pursuant to the
Pennsylvania MPC, and… the Flood
Plain Management Act, all local
ordinanaces and enactments
purporting to regulate oil and gas well
operations regulated by this act are
hereby superseded.”
PA Floodplain
Management Act
(1978)
• Mandates Municipal Participation in &
Compliance with the NFIP
• Adopts minimum requirements of the NFIP by
reference
• Establishes Higher Regulatory Standards
Hazardous Materials
HIGH Risk Land Uses
• Designates DCED (GCLGS) as State
Coordinator
PA Floodplain
Management Act
• Floodplain Management is a local
responsibility (Municipal).
• Each municipality has a floodplain
ordinance
• They have copies of Flood
Insurance Rate Maps (FIRM)
• Designate a Floodplain
Administrator
Key NFIP Language 1
• Development - any man-made change to
improved or unimproved real estate, including
but not limited to the construction, reconstruction,
renovation, repair, expansion, or alteration of
buildings or other structures; the placement of
manufactured homes; streets, and other paving;
utilities; filling, grading and excavation; mining;
dredging; drilling operations; storage of
equipment or materials; and the subdivision of
land.
Key NFIP Language 2
•
(c) The following list of materials and substances shall be considered
dangerous to human life:
– production or storage of any material or substance listed in
subsection (c) of this section, or which will be used for any activity
requiring the maintenance of a supply - more than 550 gallons or
other comparable volume - of any such materials or substances on
the premises, or which will involve the production, storage, or use
of any amount of radioactive substances.
(1) Acetone
(7) Chlorine
(13) Phosphorous
(2) Ammonia
(8) Hydrochloric acid
(14) Potassium
(3) Benzene
(9) Hydrocyanic acid
(15) Sodium
(4) Calcium carbide
(10) Magnesium
(16) Sulphur and sulphur products
(5) Carbon disulfide
(11) Nitric acid and oxides of nitrogen (17) Pesticides
(6) Celluloid
(12) Petroleum products—gasoline,
fuel oil, and the like
(18) Radioactive substances insofar
as such substances are not
otherwise subject to regulation
Key NFIP Language 3
• “Manufactured Homes” shall be:
– placed on a permanent foundation.
– elevated so that the lowest floor of
the manufactured home is at least
one and one half (1 ½) feet above
base flood elevation.
– anchored to resist flotation,
collapse, or lateral movement.
Bottom Line
• If you have any activity in
the Floodplain, need a local
permit!
– Water withdrawal sites (most likely)
– Storage yards
– Parking lots
– Pipeline Crossings
The Basic Sequence
for Facility Siting
1. Preliminary siting decisions by geology,
rights, logistics, and purpose
2. Check for floodplains (local officials or
http://www.msc.fema.gov)
3. If in floodplain consider moving
facility!
4. If no viable alternative follow DCED
permitting flowchart (handout)
5. Engage local and state officials
How do I know if
I am in a floodplain?
Flood Insurance Rate
Maps (FIRM) - Old
FEMA Map
Modernization 1
FEMA Map
Modernization 2
• Ongoing since 2005 in PA
• Newest maps are based on 2-foot
contours from LiDAR
• Great products, but inconsistent
coverage
– Limited new studies
– First Counties did not use LiDAR
– Long adoption process
Flood Insurance Rate
Maps (FIRM) - New
DFIRM BASICS
DFIRM – Digital Flood Insurance Rate Map
DFIRM BASICS
Zone A:
• No Base Flood
Elevations (BFEs)
determined.
•
Zone A studies are
considered “approximate”
analyses, in that they are
typically performed with
less detail (less $ to
create for communities).
•
Only the 100-yr boundary
is shown, with no crosssections or BFEs
displayed.
DFIRM BASICS
Zone AE:
• Base Flood Elevations
determined.
•
Usually include detailed
survey of hydraulic
structures (bridges,
culverts, etc.) and crosssections, often have a
floodway analysis
performed, and have
BFEs determined and
shown on the maps.
DFIRM BASICS
Floodway:
• The channel of a river or
other watercourse and
the adjacent land areas
that must be reserved in
order to discharge the
base flood without
cumulatively increasing
the water surface
elevation more than a
1.0‘.
•
Usually, this means 0.00’
increase for any
proposed development
DFIRM BASICS
Shaded Zone X:
• Areas of 0.2% annual
chance flood (500-yr)
•
Areas of 1% annual
chance flood with
average depths less than
1 foot or with drainage
areas less than 1 square
mile
•
Areas protected by
levees from the 1%
annual chance flood
DFIRM BASICS
Cross-Sections (XS):
• Graphical depiction of the
XS in the hydraulic
model. All mapped XS
appear in the model
(HEC-2 or HEC-RAS).
•
Not all modeled XS may
appear on the map. XS
lettering is shown in the
hexagon.
•
FEMA Standard FIRMs
are lettered sequentially
starting with “A” at the
downstream-most printed
XS.
DFIRM BASICS
• Should be used with the
DFIRMs
• Documents additional
information regarding study
methodologies, source
data, and results
• Provides elevation results
in tabular and stream
profiles for detailed study
streams
DFIRM BASICS
•
Zone X (shaded): Areas of 0.2% annual chance flood (500-yr); areas of 1%
annual chance flood with average depths less than 1 foot or with drainage
areas less than 1 square mile; and areas protected by levees from the 1%
annual chance flood
•
Zone X (unshaded): Areas determined to be outside the 0.2% chance
floodplain
•
Zone AH: Flood Depths of 1-3 feet (usually areas of ponding)
•
Zone AO: Flood Depths of 1-3 feet (usually sheet flow on sloping terrain)
•
Zone AR: Area of special flood hazard formerly protected from the 1%
annual chance flood event by a flood control system (levee, etc.) that was
subsequently decertified. Indicates that the former flood control system is
being restored to provide protection from the 1% annual chance or greater
flood.
•
Zone A99: Area to be protected from the 1% annual chance flood event by
a Federal flood protection system under construction; no BFEs determined