FLOOD09044

• County: Pueblo
• Community: Pueblo
• Stream Name: Goodnight Arroyo, Dry Creek
• Basin: Arkansas
• Title: Floodplain Information Report
• Date: 4/1/1987
• Prepared For: Pueblo, City and County
• Prepared By: US Army Corps of Engineers
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

MAIN fLOGO SEASON for th~ At~nsas Rivor subbasin ~bov~ John
M,,~tin D~'I\ is during the l~te spring and 6Uf1\mer ,nonths. L~te
~pring snow storm~ in the higher "lev-HUang dnd high int~~s1ty
rein$ over ~he plBins r~gion in conjunction with ~he physical
features of the watsr8hsd oan produce the rapid concsntration
of tun~ff th~t ch~t~ct~ri~~~ fIdsh floods of high p~ak flo~,
sm~li volu~es, dnd short durations.

about 10 fRet in 6 hours et a maxi~~m .ate of 4.2 fset pet ho~r;
~nd GoodnIght Arroyo would rise ~bout 4.9 fe~t in 6.5 hou.$ at a
m~ximum r~t~ of 1.1 feet per ho~r.

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VELOCITIES Of WATER during the Standa.d Proje~t flood wo~ld
~ange up to ebout ~4 feet per ~econd (approxim~tely 16 mile6
per hou~) in tne m~in channels of the tn.e~ st~sam$. Velocities
o~bId~ of tn~ main channels would ve~y widely, d~pending upon
locetion, but would ~e~ch abo~t 6 feet psr second (app~oxi~~tsly
4 mile~ p9r hou~) in SDm9 a~eag. The$e high velocities du~i~g ~
m~jor flood would be ext.emely dangerous to life and prop8~ty.
Vslocltios greate~ tnan 3 faot per second cambined with depths
of 3 f90t or more are ganorally considered haz~rdoua.

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fLOOD DA~Ar,E PREVENTION ~EASURES prB~ently consiat of lavees oan_
structed in the lo~er reaches of Wild ~orse.D~y Cresk ~nd Dry Creek
nSar their mouths on th~ A.kansa~ River. Regui~tory city and
county zonIng ordinances exi3t ~hich govsrn dav-alopment in 8peci.
fied specid~ flood plain distriots along fo~ntain Creek, D~y cresk,
~ild Horse_Dr~ Craek, and the Ark~n~as River. Channslization on
Wild Hor~s-Dry C~eek is proposed in the Corp5 of Engin8~rs "Repo~t
on RBv1a~ Survey for flood Control and Alli,d P"~n_." _
~.~~ At"'ar,aa~
Rivar and Tribuhrise ~bcve John Mu~t1n Dam, Colorado."

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FUTURE FLOODS of g~eat~r magnitudo can be expected, but the
Stend~rd Project Flood rep,egent5 tne reasonable upper limit of
expected flooding. floOd~ the ~izo of the Int~rmediete Regional
'~ood h~ve or-currad in th~ nest and will occur 'n _h P-
~ ~ ""e. ucurs.

DURATION OF fLOODS on the subjsct tribut"~le$ would be relatively
!lhort ~~ compa~"d to those on th" Arkansas River. fo:: the Inter_
medi~te Rogionel flood ~nd St~nd~rd P~oject ,lood, duration above
bankful ~t~ge would a~er~g~ about 20 hour~ and 22 hour., respec.

Comp~ri$On5 bet~~en futwre

tl\:cly, ::~ toil::l ~o:::o-ii::.-y C:oOiq ,,"C "o,od 10 ~.~'-':~ ",r:<! 11 ~our~,

would b~ mere exhn~ive due tu the continuing
dGvelop~ent and gre~ter ~se of l~nJ in the re~~e~tive flcod pl"in~.

the l~ck of histo~ic
futwre flocd da~oge9

flood

and p,,~t
date on

floedscsMotbvmaueduoto

the subject st.eams.

ffo~sv9r,

~a$p~ctivoly, on Goodnight Ar.oyo. Thera would be no dur~tion
above bankful stage for O~y Crsek as these flows are cont~ined
~ithin it~ benkB. During thB Inte~mediats R~gional Fiuod, ~jld
Kcrs~_D~y Cre8~ ~ould ri~e About 16 feat in 10 hour~ at a
~~xImu~ rats af 3.1 fBet pat hour: Dry Creek ~ould rise about
g fa~t in 6 hc~r& at a maxImum t~ta of 4.2 fe~t per ~o~r: a~d
Goodnight Ar~oyo ~ould ri~e ~bout 4.3 feet in 6.5 nou~s et a
",,,ximuOl rate of 0.8 hOlt per ~"~r. Duriny ths St~nd~rd Projed
FlOOd, Wild Horse-Dry Cteek would rise aho~t 21 fe~t in lO hOv~B
~t a ~~xirn~~ r~te of 4.6 fe~t pBr hour; Dry Creek would rise

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