FLOOD05940

• Designation Number: 325
• County: Teller
• Community: Cripple Creek
• Stream Name: Pony Gulch, Poverty Gulch
• Basin: Arkansas
• Title: Drainage Master Plan - Cripple Creek, Final Report
• Date: 4/1/1992
• Designation Date: 7/1/1992
• Floodplain - Doc Type: Floodplain Report/Masterplan

3.

Existing structure no. 47 is a culvert which conveys overlm flows from the wesl
side of Fifth Street (Highway 67) into structure no. 46. This culvert is in poor
condition and does not function properly, therefore it should be replaced.
Although runoff from the lOO-yeardesign storm event at this location is only
23 CFS, it is recommended thai the entire flow be intercepted such that it
docs nO! continue in a westerly direction along Bennett AvenlJe and impact
the storm sewer system at the intel"$ection of Fourth Street and Bennett
Avenue. It is recommended that an inlet \\lith a minimum curb opening
length of JOfeet be installed at this location along with 50 lineal feet of 24-
inch RCP lateral.

4.

In Fourth Street between Carr Avenue and Masonic Avenue there are several
existing eulverts, inlets and storm sewer pipes associated with the ex.isting
Bennett Avenue stonn sewer system. Existing structure no. 27 is adequate but
the remaining inlets, culverts and storm sewer pipes should be replaced for
reasons discussed in Section C. Second Street Tributary. The new storm
sewer system at Bennett Avenue and Fourth Street should consist of the
following;

a. Two lo-foot curb opening inlet~, one on each side of Fourth Street,
located at the alley between Bennett Avenue and Carr Avenue.

h

150 lineal feet of 18-inch storm sewer outfall from the inletsdescri bed
in a. above to Bennell Avenue.

c.

Two lO-foot curb opening inlets, one on each side of Fourth Street.
immediately north or RenDell Avenue. Where the laterals from these
inlets tic into lhe IS.inch storm sewer outfnil. a manhoie shoulJ he

installed.

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d.

From the manhole in Bennett Avenue and Fourth Street. a new
24-illCh RCP storm sewer outfall should be installed. 400 lineal feet
of the 24.inch RCP outfall will be required. This outfall line should
extend due south in Fourth. Street to a erossing of Masonic Avenue
where it will di>ch.argt: into an existillg clJanneL

c.

Two lO-foot curb opening inlets should be installed, one on each side
of Fourth Street, immediately north of Masonic Avenue. These inlets
should tie into the 24-inch RCP outfall described above.

5.

Existing structure no. 53 (72-inchculvertwith 7.5' (lfheadwater) is a culvert
on the main channel of Cripple Creek with an existing capacity of 260 CFS.
This structure is inadequate as the design runoffassocialed with the loo-year
design storm at this point is 1,850 CFS. This flow rate is related to the fact
that flows in Cripple Creek, the Main Street trihutacy and Poverty Gulch have
all combined upstream of at tl1is location. It ~~ recommended that this
structure be replaced with a 100foot high by 14-footwidereinforcedconcrete
box culvert complete with wingwalls, headwalIs and a minimum headwater
depth of 14 feet. An cquivalent multiple pipe structure could also be
considered.

6.

Existing strueture no. 70 (24-inch culvert with 5 feet of ht:adwater) has an
available capacity of approximately 30 CFS. This culvert crosses Highway 67
in the southerly portion of the city and is required to adequatdycon veyrunoff
from the too.-year design storm event. The design runoff i~ 178 CFS,
therefore it is recommended that a 60-inch RCP culvert with headwall be
installed at this location with a minimum headwater depth of 7 feet.

J.

Existing structure no. 'l8A (24.inch culvert with 5 feet of headwater) is subjed
wthe same flows as existing structure no. 70 ahove. This culvert crO'ises a

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