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 estimated cost for these improvements is approximately
$130,000 while the approximate benefit is $1,550,000 or a
benefit cost ratio of 11.8. The cost information for both
the main stream and south tributary for this alternate are
also tabulated in Table VI.

B. RECOMMENDATIONS

As a result of the thorough studies and analyses of various
aspects of the Slaughterhouse Gulch drainageway, including
the investigation of various alternative improvements to
alleviate the flood hazards characteristic of the area, we
recommended that the drainageway plan to be adopted for the
Gulch within the study area be consistent with that proposed
in Alternate 1 for the main stream and Alternate 3 for the
south tributary. These alternates call for the replacement
of the conduit from Prince Street to the South Platte River,
channelization from Prince Street to Rio Grande Street,
flood plain zoning from Rio Grande Street to Powers Park
and street and inlet improvements along the south tributary
on Windermere Street coupled with flood plain zoning through
the study reach.

The reasons and rationale behind the selection of our
recommendation were tabulated in the interim report and
are also tabulated herein to substantiate the selection.

1. On the main stream, the cost associated with this
approach are the minimum of the three alternates con-
sidered. A definite plus in light of present tight
money supplies and the possibility of non-implementa-
tion due to insufficient funds.

2. On the south tributary, the costs are a minimum for
the structural improvements proposed which simply
increase the efficiency of existing in place facili-
ties and reduce the average annual damage by more
than 50% through the reach.

3. The proposed improvements resolve the flooding prob-
lems in the areas where the problems are directly
attributed to inadequate and undersized public drain-
~ge facilities.

4. The benefit-cost ratio for these recommended improve-
ments in all cases is maximized. For the main stream,
the ratio varies from 1.28 to 10.0 and for the south
tributary, the ratio is 11.S.

5. The recommended improvements do not require the relo-
cation of any families or the immediate acquisition
of any homes.

,VI-6