FLOOD02366

• County: Statewide
• Community: State of Colorado
• Stream Name: All
• Basin: Statewide
• Title: The Big Thompson Flood of 1976 Field Trip Guidebook
• Date: 1/1/1976
• Prepared For: Annual meeting of Geological Society
• Prepared By: USGS
• Floodplain - Doc Type: Flood Documentation Report

FIGURE

1

PROCESS MOOELS FOR THE MOVEMENT 01' MAT1!RIAL ON DEBRIS FANS

(')

Maior flood on tributarr stream;
no or mtnar flood on maIn
~.

(A) No floodinQ of matn or tributary
strealllS.

main strea~ channel

".

deposit

(d@br;s fan area cormonly
makes attractive strea.
side building sHe)

./""'otater flow moves
, de>lris from
upper reaches
af drainage basin

(building". )

(buildings on fan
destroyed by debris
movement)

(building on main stream
bank destroyed by
debris iqlilct)

(C) Major flood on main stredm; no
or minor flood on tributary stream.

(0) Maior flood on main stream and
tributary stream.

main stream occupies
new channel

flood plain

debris pOSSibly
carried away
by mainstream
flOOd

of old

buildings on truncated
area of fan and along
main stream channel
are destroyed}

water flow moves
debris from
upper reaches
of drainaqe basin

(all str'Jc,,:.;res
destroyeal

high ...ater Flo. move~ debris
down main channel

nigh water flow moves debris
<Iown main channel

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