FLOOD09316

• County: Teller
• Community: Cripple Creek
• Stream Name: Pony Gulch, Poverty Gulch
• Basin: Arkansas
• Title: Drainage Master Plan
• Date: 4/1/1992
• Prepared For: Cripple Creek
• Prepared By: GMS
• 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-yeardesignslormeventallhislocationisonly
23 CFS, it is recommended that the entire flow be intercepted such that it
docs nO! continue in a weslerly direction along Bennett AvenlJc and impact
the storm sewer system at the intel"$cction of Fourth Street and Bennett
Avenue. It is recommended that an inlet \\lith a minimum curb opening
length of JOfce! be installed at this location along with 50 lineal feel of 24-
inch RCP lateral.

4,

In Fourth Street between Carr Avenue and Masonic Avenue there are several
existing culverts, inlets and storm sewer pipes associaled with lhe ex.isling
Bennett Avenue stann sewer system. Exisling 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,
localed at the alley between Bennett Avenue and Carr Avenue.

h

150 lineal feet of 18-inch storm sewer outfall frornthe inletsllescri bed
in a. above to Bennett Avenue.

0,

Two W-foot curb opening inlets, one on each side of Fourth Street.
immediately north of Bennett Avenue. Where the laterals from lhese
inlelS tic iOlo lhe 18-inch storm sewer (lullnil, a manhoie shouiJ he

installed.

VI-17

d,

From the manhole in Bennett Avenue and Fourth Street, a new
24-inch RCP storm sewer outfall should be instalied. 400 lineal feet
of the 24.inch Rep outfall will be required. This oUlfalllinc should
extend due south in Fourth Street to a crossing of Masonic Avenue
where it will di>charge into an existillg elJallnel.

0,

Two 10-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-ineh RCP outfall described above.

5,

Existingsttucture 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 llSthe design runoffassocialed with the loo-year
design storm at this point is 1,850 CFS, This flow rate is related to the facl
that flows in Cripple Creck, the Main Street tributary and Poverty Gulch have
all combined upstream of at this location, It ~~ recommended tbat this
structure be replacedwilh a 100foot high by 14-footwidereinforcedconcrete
box culvert complete with wingwalls, headwalls and a minimum headwater
dcpth of 14 feet. An equivalent multiple pipe structure could also be
considered.

6,

Existing structure no. 70 (24-ineh culvert with 5 feet of headwater) has an
available capacity of approximately 30 CFS. This culvert crosses Highway 67
in the southerly portion of the city and is required to adequately convey runoff
from the loo.-year design storm evenl. The design runoff is 17R CFS,
therdore it is recommended that a 60-inch RCP culvert with headwall be
installed at this location with a minimum headwater depth of 7 feel.

J,

Exi.'Oling ,truetore no. 'lRA (24-inch culvert with 5 feet of headwater) is suhjed
l(l the same flows as existing struclUre no. 70 ahove. This culvert crmses a

VI-HI