FLOOD09312

• Designation Number: 370
• County: Crowley
• Community: Ordway
• Stream Name: Local Drainage
• Basin: Arkansas
• Title: Floodplain Study and Master Drainage Plan - Ordway, Colorado
• Date: 6/1/1987
• Designation Date: 7/1/1994
• Floodplain - Doc Type: Floodplain Report/Masterplan

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32

Lar\Je diameter pipe sizes (greater than 54 inches) would be necessary and
their cost could be prohibitive.
Flooding problems in the Central Basin, particularly along Otero and
Lincoln Avenues, and along Railroad Avenue could be alleviated with the use of
diversion. The flow which enters the Town at 11th Street and Otero Avenue
(extended) moves south into the Otero Road ri ght-of-way. The absence of a
stormwater system and curb and gutters forces this flow to spread through the
streets, and eventually to the box cul vert under the rail road grade. The
diversion of this flow could reduce the threat of shallow flooding, while at
...e.
the same time el imi na~ the need for enl argi ng the exi sti ng box cul vert at
the railroad. Diversion appears to have a feasibility from the flood control,
cost, and constructability standpoints.
Diversion of flow within the Northwest Basin is not feasible, at least
within the Planning Area. The natural drainageway produces the flooding
threat along County Road 17, because of its inadequate hydraulic capacity. In
order to create an effective diversion to mitigate the flooding potential the
Northwest Basin poses to the Town of Ordway, a collection point must be
constructed approximately liZ-mile south of the Colorado Canal (refer to
Chapter V, Selected Plan). This diversion would have to be carried through to
the Northwest Basin outfall point at the railroad trestle, approximately one-
quarter mile west of the Town (i.e., DP-71.
Figure 8 presents a conceptual layout of a drainage system, incorporating
the diversion concept in the Central and Northwestern Basins.

Detention
The detention concept has generally been employed in instances where the
capacities of storm drainage facilities have been exceeded because of
increases in runoff due to urbanization, or in areas where urbanization has
blocked the natural drainage path. The major concern with detention in a
small town is that a long-term maintenance program for detention ponds may be
difficult to finance. The effectiveness of a detention system is dependent
upon the proper functioning of the pond and outlet system. An improperly
maintained detention system can lead to stagnation and debris build-up
problems, which can prompt complaints from residences or business adjacent to
the pond site.

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