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

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I

SECTION VII

DESIGN CRITERIA

To provide a basis for the proposed preliminary design, various
design criteria has been selected to provide continuity of design.
The criteria should be carried through to final design to carry
out the plan objective. Even with unchanged criteria, the plan
may change in light of new or additional field information.
.01
Plan criteria is consistent with that outlined in the Denver
Regional Council of Governments Urban Drainage and Flood Control
Manual. The Manual, of course, is used for major drainageway
plann1ng throughout the metropolitan area and thus provides a
consistency in planning for all projects including the uni-
jurisdictional Slaughterhouse Gulch.

A. TABULATED DESIGN CRITERIA

The intent of the
design criteria.
final design.

preliminary design is described in the following
This criteria should be adhered to when completing

1. Grass Lined Channels - Where construction of new channels
1S proposed, the design will generally be based on
channels having shallow grass lined side slopes and a
separate low flow channel. Because of the very steep
low flow channels in our case, rip rapping will be
required to armor the low flow channel against erosion
and scour. Drop structures are used in areas where cutting
and filling of channels is necessary for construction
reasons. Where feasible, the channel cross section and
improvement characteristics should be such that they
lend themselves to multi-purpose uses. These uses
include parks, green belts and hiker/biker paths which
are included on the channel cross section between Rio
Grande Street and Prince Street. This hiker/biker
path will also act as a maintenance road wide enough
for maintenance vehicles to pass very near the invert
of the channel. Additional items of criteria for grass
lined channels include:

a. Maximum velocity of flow in channels during the
100 year storm occurrence 7 fps.

b. Design depths in the range of 4' for the normal
channel cross sections. Depths will be greater
in backwater areas.

VII-l