FLOOD00689

• Designation Number: 136
• County: Arapahoe
• Community: Littleton
• Stream Name: Slaughterhouse Gulch
• Title: Major Drainageway Planning - Slaughterhouse Gulch, Littleton
• Date: 5/1/1974
• Designation Date: 5/1/1979
• Floodplain - Doc Type: Floodplain Report/Masterplan

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The area within the delineated laO-year flood plain is again
to be flood plain zoned and qualified for flood insurance as
per the flood control program. The property at the corner of
Huron Street and Powers Drive is susceptible to approximately
three feet of flooding at the house. Floodproofing should be
incorporated into this structure to minimize the potential
flood hazard. Consideration should also be given by the City
to possible acquisition of the property at the first oppor-
tuni ty .

Drawing No. ST-I

This drawing covers the reach of the south tributary from the
confluence with main Slaughterhouse Gulch to Powers Avenue
on the south. Under present conditions, nearly the whole
northwest quadrant between Windermere Street and Powers Avenue
is susceptible to shallow, overland flooding. This is due to
the inadequacies of the existing storm sewers and street
systems in the area.

Improvements proposed for this area include the installation
of larger graded inlets along Windermere Street to intercept
the high frequency, two-year runoff flows. The existing
storm sewer along Windermere Street, which traverses between
the apartment building and outfa1ls at a point due west of
Windermere Street, is sized to carry the additional flow which
can be intercepted by the additional inlets. To reduce the
flooding caused by the low frequency laO-year storm events,
it is recommended that Windermere Street be improved by
lowering the street profile. This improvement, complemented
with revised site grading to incorporate a small embankment
into the property on the northwest corner of Powers Avenue
and Windermere Street, would redirect the flows in excess
of the capacity of the storm sewer to the north along
Windermere Street and into the main flood plain of Slaughter-
house Gulch.

The suggested centerline profile for Windermere Street is
showing on Drawing No. ST-2 along with a typical cross section
of the street through the improved reach. At the maximum
point, the profile would be lowered by approximately 2 feet.
It is important that all utility conflicts be identified
during the design stage to confirm whether there are any
utilities which must be moved or lowered before the street
improvements are made.

Drawing No. ST-2

This drawing covers the reach in the south tributary extend-
ing from Powers Avenue to the upstream limits of the study of
the south tributary at Datura Street. Under the present
state of development, this area provides no adequate way
of properly draining the approximately 200 acres tributary
to the Littleton Boulevard - Windermere Street intersection.
Storm sewers have been provided in this area, however, the
capacity of the storm sewer system is negligible in comparison
to the major drainage needs.

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