FLOOD09511

• County: Fremont
• Community: Canon City
• Stream Name: NE Canon Drainage Area
• Basin: Arkansas
• Title: Floodplain Information Report
• Date: 10/1/1981
• Prepared For: Fremont County
• Prepared By: Great Divide Engineering
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

TABLE 1

CHilPTERV
HYQRAULIC ANALYSIS

TAgLE OF lDO-YEAR ~ISCHARGES

Hydraulic Procedures

LOCATICN

DRA1NAGEAREA
{SquJree:i1es)

lOO-YEAR
Oischarge

X-SeeSG

North of High St.
(Subloasin from N',,')

1.67mi2

630 cfs

Hydrau 1 ic ~na lys i s for thi s study inc 1 uded cO~lputat ion of water sur-
face elevations and profiles along the drainage ways and their tributaries
to the limits of the study area. b'ater surface elevations were computed
fro~ the cross section of the cha~nel. channel roughness coefficients,
~nd bridge hydraulic and structurdl characteristics utilizing the Corps
of E~gineers HoC-2 conputer program.
Results of the lOO-year frequency flood computatiQ~s' are shown on
T hl~" Th~ '"'' ,.~"~ ~_~",.,c,y 'I'"d _~~~". I'e .C."",e ,_ ~','~' 'C
.J.u"_ ... ,"~ 'V~-JL~' "~~~" ,~v ~'V"'~ ~ '''~~,''"'' c~,-,~

X-See BO f,orth of High St. l.Olmi2 926 efs
(SHhnil';1n fr~,,- N~ )
X-See SF South of Higll SL 2.68 ., :G50 efs
m
X-SccE3 South of So~tn SL 3.17 , 1450 ,fs
",

~ -Sf'( ~}:

South of H~rdin9

(p~rt cf a~'IC arN)

738 ds

throJgh21. Cross sections used were tltoseobtained frO:1lfield sL.rveys
arid topogr~pJ1ic maps. The loe~t ion of the cross sections are sho,,~ on
the flooded area "'~ps for the lOQ-year flood i~ Plates 3 through 14, J~d
on the flood profiles on 1'1 ~tes 15 tllrougll 21.
Water surface elevations pl'esented in Table 1I ore bosed on COII'PU-
tJtiolls JSSJming no redoctior.s ill lhe Chonn", or hydraul ic ~trucbr",
convey~r.ce c~pabi 1 i ties. Such reuuctions. d"~ to debris o(;eu",~l Jtion.
arc likely to occur doring flood flow periods resulting i~ higher water
surface elevations.
Chan~el roughness f~ctors Wdn~ing's "n") for these cc""putatio~s
were a~si'lned on the basi s of field inspection of the floodplain areas,
and ranged from .035 to .065.
A detailed description of the hydraulk analysis is included in the

:(- See ,~,D

~or~~ of ~Jrj;r.g

'S" .1
..,,::11

3S8 ds

X-Sec

S

North of Central

4.75

1
'01

i660 cfs

Tec~~~;c31 Addcr.d~~.

X-See

c

~orth Of Kou~tl Av~.

5.53

.1
Cll

2380cf,

Flood~lain Subdivision

The lOO-y~dr floodplain in this study has been sub~ivided into a
f100U....dy Iii i ~h h~l~rd) area and a floodfringe (1ow h,ndrd) ~r!'a.

"

c,

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