FLOOD01592

• Designation Number: 248
• County: Hinsdale
• Community: Lake City
• Stream Name: Lake Fork of the Gunnison River and Henson Creek
• Title: Floodplain Information Report - Lake Fork of the Gunnison River and Henson Creek, Lake City, Colorado
• Date: 10/1/1985
• Designation Date: 1/1/1986
• Floodplain - Doc Type: Floodplain Report/Masterplan

Flcoaplal11 An area i.1dl1dadJacen,toa stream, wnicnarea is
subject to flooding as the result of tne occurrence
cf a tOO-year flood and which area thus is so adverse
to past, current, or foreseeable construction or land
use as to constitute a significant hazard to public
health and safety or to property.

FlOOd Profile A graph showing the relationship of water surface
elevation to location, the latter generally expressed
as distance above mouth for a stream of water flowing
in an open channel. It is generally dra./n to ShOw
surface elevation for the crest of a speCific flood,
but may be prepared for conditions at a given time or
stage.

Flood Stage The stage or 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.

Meander

Peak Discllarge

Precipitation

Probability

ReaCh

Floodway Thecllannelofastreamandtheportionsofthe
adjoining floodplain required to pass tile discnarge
of the 100.year flood with an insignificant increase
in flood levels. As used In the National Flood Insurance
Program, f!oodways must b~ large ~nougll to pass the
100.yeardlschargewlthoutcausingti1oi!i!oodt:,evation
to increase more than a specified amount (usually
one foot).

Recurrence
Interval

Reference Point

Right Bank

Runoff

Left Bank The bank on the left side of a river, strea~ or water
course as the observer looks downstream.

L01-PearsonType
II OlstrlDutlon A statistical distribution used in flood frequency
analysis, which is described by three parameters; mean,
standard deviation. and coefficient of skewness of the
logarithms of the sample observations.

Stream

Watershed

"'
'"

The ~lnding of a stream c~annel.

The lar~est value of streamflo~ attai~ed by a flood,
usually reported In units Of cubic feet cer second.

Is the discharge of water, in liquid or solid state,
out of the atmosphere, generally upon a land or water
surface. Precipitation includes rainfall,snow, hail,
and sleet, and is therefore a more genera! term than
rainfall.

The annuai chance of occurrence of specific hydrologic
events, such as rainfall over a specified area or peak
discharge at a specified location expressed in percent,
e.g. 5% representing one chance in 20 of the event
occurring in any year or an average recurrence of once
in twenty years.

A segment of the river defined between t~o specified points.

The average interval of time, in years, within Which a
given flood will be exceeded once.
A numbered point identifying a specific location for
correlating the data Shown in various forms throughout
tnereport.

The bank on the right side of a river, stream or water
course,lookingdownstredm.

The quantity of rainfall which flows over the surface
to enter the stream as discharge volume. Thedifference
in quantity between rainfall and runoff represents losses
to infiltration and interception.

Any natural channel or depression through which water
flows either continuously, intermittently or periodically,
IncludIng any artificial modification of the l1atur~1
channel or depression.

ihe drainage area situated above a specified po:nt or.
a stred!ll!ncludingthe area drainel.iby tributary stred.':lS
which enter the main stream above this point.

3'