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: Reducing Flood Losses in High Risk Areas.

Hazard

AI/uvial
Fans

Areas
Behind
Unsafe or
Inadequate
Levees

Areas
Below
Unsafe or
Inadequate
Dams

Special
Risk
Factors

· Lack of
permanent
drainage
channels
· Velocity
· Sediment
and debris
· Erosion

· Velocity
· Duration
· Suddenness

· V eloci ty
· Suddenness
· Debris in
water

Area of
Occurrence

Primarily moun-
tainous areas in
the west and
southwest

Riverine areas
throughout
the country

Riverine areas
throughout
the country

B-2

· Prohibit development on fans or, if
it is to occur, require elevation on
pilings or other enclosures to protect
against water velocities and debris.
· Map fans as high risk areas.
· Develop and implement a drainage
master plan if development is to
occur on fans.
· Limit grading, paving, and channel-
ization unless consistent with master
plan.
· Construct flood walls, drainage chan-
nels, debris basins,

· Map levees; assess their adequacy.
· Define inundation zones for areas
behind unsafe or inadequate levees.
· Require periodic inspection,
maintenance of levees.
· Adopt building standards based on
risk of breaching or overtopping.
· Require pump systems; other methods
for dealing with internal drainage
behind levees.
· Install or require installation of
warning systems and evacuation
plans for areas protected by unsafe
or inadequate levees.

· Coordinate floodplain management
and dam safety programs.
· Map dams; assess their adequacy.
· Identify inundation zones for
inadequate or unsafe dams as if
dams were not in place; map
flood way and flood fringe areas.
· Abate or require abatement of unsafe
or inadequate dams.
· Restrict new development below
unsafe or inadequate dams.