BOARD00391

• Board Meeting Date: 5/23/2005
• Description: Flood Section - Floodplain Rules and Regulations Opportunity for Board and Public Comment
• Board Meetings - Doc Type: Memo

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Hydrogeomorphology

Letter of Map
Amendment
(LOMA)-

Letter of Map
Revision (LOMR)

LIDAR (Light
Detection and
Ranging)

Mudflow

Metadata

Mitigation

National J<'looa-
Insurance Program
(NFIP)

North American
Vertical Datum 1988
(NA VD 1988)

Definition

Study of the physical appearance and operational character of the river as
it adjusts its boundaries to the magnitude of stream flow and erosional
debris produced within the attendant watershed.

.

An amendment to the currently effective FEMA map that establishes that a
property is not located in a Special Flood Hazard Area. LOMAs are issued
by FEMA.

An official amendment to the currently effective FEMA map. It is issued
by FEMA and changes flood zones, delineations, and elevation.

LIDAR uses the same principle as RADAR. The LIDAR instrument
transmits light out to a target. The transmitted light interacts with and is
changed by the target. Some of this light is reflected and scattered back to
the instrument where it is analyzed. LIDAR is widely used for collection
of ground topography data used in floodplain studies.

A river of liquid and flowing mud on the surfaces of normally dry land
areas, as when earth is carried by a current of water. Other earth
movements, such as landslide, slope failure, or a saturated soil mass
moving by liquidity down a slope, are not mudflows.

Data about the data used in a floodplain study. Metadata is commonly
used in GIS and usually includes information about the intellectual content
of the image, digital representation data, and security or rights
management information.

.

The process of preventing disasters or reducing related hazards.
Mitigation can be structural, such as flood proofmg structures, diverting
floodwaters, purchasing property for open space, detention ponds,
floodwalls and levees, etc. It can also be nonstructural in nature, such as
education, planning, and design of flood prevention measures, emergency
preparedness plans, and early flood warning detection systems.

1<hMA's program of tlood msurance coverage anufloodplain managemem
administered under the Act and applicable Federal regulations
promulgated in Title 44 of the Code of Federal Regulations, Subchapter B.
The U.S, Congress established the NFIP on August 1, 1968, with the
passage of the National Flood Insurance Act of 1968.

The vertical adjustment system using the new sea level datum from the
1980's. It redefines the heights of several hundred thousand benchmarks
across North America.

.

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DRAFT