FLOOD00315

• County: Summit
• Community: Breckenridge
• Stream Name: Blue River
• Title: Breckenridge Floodplain Information 1975
• Date: 1/1/1975
• Prepared For: Breckenridge
• Prepared By: Leonard Rice Consulting Water Engineers, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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GLOSSARY

BaCKwater Effect. The rise in surface elevation of
flowing w~tcr upstream from and as a result of an obstruc-
tion to flow.

Flood Stage.
natural banks of

The elevation at which overflow of the

a stream or body of

water begins
is measured.

in the

reach or area in which the elevation

Flood. An overflow of water onto lands used or usable
by man and not normally covered by water. Floods have two
essential characteristics, the temporary inundation of land;
and the land is inundated by overflow from a river, stream
lake or ocean. Normally a "flood" is considered as any tem-
porary rise in streamflow or stage, (but not the ponding
of surface water), that results in significant adverse
effects in the vicinity. Adverse effects May include damage
from overflow and land areas, temporary backwater effects
in sewers ~nd local drainage channels, and creation of
unsanitary conditions or other unfavorable situations from
deposition of material~ coincident with increased ~trcanflow.

Floodwa~. The channel of the stream and that portion
of the flood plain Which is used to carry flood flows.
Intermediate Regional Flood. A flood having an average
frequency of occurrence on the order of once in 100 years
although it has a statistical one percent chance of being
equalled or exceeded during anyone year.

Cloudburst. A sudden and extremely heavy downpour ef
rain that is small in areal extent: of short duration; and
may be accompanied by lightning, thu~dcr, and strong gusts
of wind.

Sheet Flew. Broad, shallow overland flood flows vary-
ing from a few inches in depth to two feet.

Standard Project Flood. The flood that may be expected
from the most severe combination of meteorological and
hydrological conditions that are considered reasonably
characteristic of the geographical area in Which the drainage
basin is located, excluding extremely rare combinations.

Flood Peak. The maximum instantaneous discharge of a
flood at a given location_ It usually occurs at or near the
time of the flood crest, the maximum stage or elevation
reached by the flood flow.

Flood Plain. The relatively flat area or lowlands

<l<.1joiuilllj .. river, stream, w<Jt€J:coursc, ocean, or lake, ;,'hich
have been or may be covered by tlood water.

Flood Profile. A graph showing the relationship of
water surf"ce elevation to locat.ion, th,' latter S1"n"r2l1ly
expressed as distance above mouth for a stream of wdt.eI [lu"'-

ing in an open channel.
elevation for the crest

It is gener~lly dr~wn to ~haw 5urf~ce
of " spe<.'ifie fluo<.1, but "'''''I I.J", 1'1'(:-

p"red for conditions at a given time or stage,

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