FLOOD00816

• County: Boulder
• County: Weld
• Community: Boulder, Weld Counties
• Stream Name: Dry Creek
• Title: Floodplain Information Report
• Date: 6/1/1978
• Prepared For: Boulder County / Weld County
• Prepared By: US Army Corps of Engineers
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

, " GLOSSARY OF TERMS

generally drawn to show surface elevation for the crest of a
specific flood, but may be prepared for conditions at a given time
or stage.

Flood

An overflow on lands not normally covered by water and
that are used or usable by man. Floods have two essential char-
acteristics: (I) the Inundation of land Is temporary; and (2)
the land Is adjacent to and I nundated by overflow from a river, a
stream, an ocean, a lake, or other, body of standing water.

Flood Staqe
The stage of elevation at which overflow of the natural
banks of a stream or body of water begins In the reach or area In
which the elevation Is measured.

Nonmally~ a flood Is considered as any temporary rise In
streamflow or stage, but not the pondlng of surface water, that
results In significant adverse effects In the vicinity. Adverse
effects may Include damages from overflow of land areas, temporary
backwater effects In sewers and local drainage channels, creation
of unsanitary conditions or other unfavorable situations by deposi-
tion of materials In stream channels during flood recessions, rise
of ground water coincident with increased streamflow, and other
problems.

Head Loss
The effect of obstructions, such as narrow brldge'open-
Ings or buildings, that limit the area through which water must
flow, 'raising the surface of the water upstream from the obstruc-
tion. '\

Left Bank
,
The bank on the left side of a river, stream, or water
course looking downstream.

Flood Crest

The maximum stage or elevation reached by the waters of
a flood at a given location.

Reference Point
A numbered point Identifying a specific 19Catlon used
for correlating the data shown In various forms throughout the
report.

Flood Plain

The relatively flat area or low lands adjoining the chan-
,nel of a, river,' stream, water course, ocean, lakll, or other body
of standing water which has been or may be covered by floodwater.

RlqhtBank
The bank on the right side of a river, stream, or water

course looking downstream.

Flood Profile
A graph shOWing the relationship of water surface eleva-
tlon'todocatlon, the latter generally expressed as distance above
mouth <'for, a' stream of 'water f lowing In an open channel. ' It Is

10-, 50-. 100-. and 500-Year Flood
A flood having a 10, 2, I, or .2 percent probability,
respectively, of occurrence in any yoaror jln average frequency
of occurrence In the'orderaf once: In' 10, 50" 100, or 500 years,

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