FLOOD05464

• County: Statewide
• Basin: Statewide
• Title: Reducing Losses In High Risk Flood Hazard Areas: A Guidebook For Local Officials
• Date: 1/1/1985
• Prepared For: FEMA
• Prepared By: Association of State Floodplain Managers
• Floodplain - Doc Type: Educational/Technical/Reference Information

Management Options

Table I, cant.: Reducing Flood Losses in High Risk Areas.

Hazard

Flash
Flooding,
con!.

Long-Term
Fluctuations
in Lake
Levels

Special
Risk
Factors

* Long
dura tion
* Waves and
ice
* Lake
quality
degradation
as flooded
sewage
systems fail
* Ground water
quality
degradation
as flooded
wells act
as conduit
to transfer
lake water
to aquifers

Ground
Failure:
Liquefaction *

* Collapse of
structure
Suddenness
of flooding

Area of
Occurrence

Primarily
northern states
(glacially
formed lakes)
with water
elevations
dependent
upon ground
water levels;
lakes in
western states
without
outlets

San Francisco
Bay, Alaska,
New Madrid
Fa ult Zone Area,
other areas
with saturated
soils and
earthquake
threat

B-4

* Require that subdividers install
onsite flood detention; design
drainage systems to reduce flash
flood potential.
* Mark areas.
* Construct reservoirs and other
engineering devices to reduce
flash floods.

* Map historical bed of lake.
* Adopt floodplain, shoreland and
wetland ordinances to direct
development.
* Require elevation of structures and
public utilities on fill (not pilings).
* Prohibit septic and water systems in
flood areas is development is to
occur.
* Adopt setback back lines or
additional freeboard if develop-
ment is to occur to reduce damage
from waves and ice damage to
structures,
* Acquire flood-prone lands and
relocate threatened structures.
Install pumps, other engineering
works to reduce or stabilize lake
levels.

* Conduct special studies to deter-
mine areas and levels of risk.
* Adopt special building design
standards for pilings, densities of.
development, loading factors.
* Acquire highly unstable lands and
relocate structures.