2005 Idaho Code - 46-1021 — DEFINITIONS

                                  TITLE  46
                         MILITIA AND MILITARY AFFAIRS
                                  CHAPTER 10
                       STATE DISASTER PREPAREDNESS ACT
    46-1021.  DEFINITIONS. As used in this act:
    (1)  "Development" means any manmade change to improved or unimproved real
estate, including, but not limited to, the construction of buildings,
structures or accessory structures, or the construction of additions or
substantial improvements to buildings, structures or accessory structures; the
placement of mobile homes; mining, dredging, filling, grading, paving,
excavation or drilling operations; and the deposition or extraction of
materials; specifically including the construction of dikes, berms and levees.
    (2)  "Flood" means a general or temporary condition of partial or complete
inundation of normally dry land areas caused by the overflow or rise of river,
ocean, streams or lakes, or the unusual and rapid accumulation or runoff of
surface waters from any source.
    (3)  "Flood fringe" is that portion of the floodplain outside of the
floodway covered by floodwaters during the regulatory flood.
    (4)  "Floodplain" is the land that has been or may be covered by
floodwaters, or is surrounded by floodwater and inaccessible, during the
occurrence of the regulatory flood.  The riverine floodplain includes the
floodway and the flood fringe.
    (5)  "Floodplain management" is the analysis and integration of the entire
range of measures that can be used to prevent, reduce or mitigate flood damage
in a given location, and that can protect and preserve the natural,
environmental, historical, and cultural values of the floodplain.
    (6)  "Floodproofing" means the modifications of structures, their sites,
building contents and water and sanitary facilities, to keep water out or
reduce the effects of water entry.
    (7)  "Flood protection elevation" means an elevation that shall correspond
to the elevation of the one percent (1%) chance flood (one hundred (100) year
flood) plus any increased flood elevation due to floodway encroachment, plus
any required freeboard.
    (8)  "Floodway" is the channel of the river or stream and those portions
of the floodplain adjoining the channel required to discharge and store the
floodwater or flood flows associated with the regulatory flood.
    (9)  "Freeboard" represents a factor of safety usually expressed in terms
of a certain amount of feet above a calculated flood level.  Freeboard shall
compensate for the many unknown factors that contribute to flood heights
greater than the height calculated.  These unknown factors include, but are
not limited to, ice jams, debris accumulation, wave action, obstruction of
bridge openings and floodways, the effects of urbanization on the hydrology of
the watershed, loss of flood storage areas due to development and the
sedimentation of a river or stream bed.
    (10) "Local government," in the context of this chapter, means any county
or city having planning and zoning authority to regulate land use within its
jurisdiction.
    (11) "Mitigation" means any action taken which will reduce the impact,
damage or cost of the next flood that occurs.
    (12) "Person" means any individual, group of individuals, corporation,
partnership, association, political subdivision, public or private agency or
entity.
    (13) "Regulatory flood" is a flood determined to be representative of
large floods known to have occurred in Idaho and which may be expected to
occur on a particular stream because of like physical characteristics.  The
regulatory flood is based upon a statistical analysis of stream flow records
available for the watershed or an analysis of rainfall and runoff
characteristics in the watershed. In inland areas, the flood frequency of the
regulatory flood is once in every one hundred (100) years; this means that in
any given year there is a one percent (1%) chance that a regulatory flood may
occur or be exceeded.