FLOOD00281

• County: Larimer
• Community: Greeley
• Title: Design Criteria and Construction Specifications volume 2 of 5 Storm Drainage Criteria
• Date: 10/1/1997
• Prepared For: Greeley
• Prepared By: Department of Public Works
• Floodplain - Doc Type: Educational/Technical/Reference Information

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The ml.nl.mum horizontal separation between storm sewers or sanitary
sewers and water lines will be 10 feet.

6.6 pipe size

The minimum allowable pipe size for storm sewers, except for
detention outlets, shall be 18 inches in diameter and shall be
round pipe. Table 6-1 presents the minimum pipe size for storm
sewers.

6.7 Manholes

Manholes or maintenance access ports shall be required whenever
there is a change in size, direction, elevation, grade, or where
there is a junction of two or more sewers. A manhole may be
required at the beginning and/or at the end of the curved section
of storm sewer. The maximum spacing between manholes for various
pipe sizes shall be in accordance with Table 6-1.

The required manhole size shall be as follows:

MAlllIOLB SUB
Sewer Diameter Manhole Diameter
15" to 18" 4 I
21" to 30" 5'
36" to 54" 6'
60" and laraer CDOT Standard M-604-20 and M-604-21

Larger manhole diameters or a junction structure may be required
when sewer alignments are not straight through or more than one
sewer line goes through the manhole.

6.8 Maintenance and Access Basements

An important aspect of storm sewer operation is the continued
maintenance of the facilities to ensure that they will continue to
function as designed. Maintenance may include cleaning of trash
racks, inlet and outlet structures, and the removal of sediment and
debris from the storm sewers. The City requires that maintenance
access be provided to all storm drainage facilities. The following
minimum easement widths, which must be shown on the Final Plat, are
required:

RBQtJIRBD STORK SBWBR MAIN'l'BNUtOB AND AOOBSS JlDBIIBlITS . .
... . .,. .
stora Sewer Diameter Bas_ent Width .
Less than 36" 20'
Equal to or greater 25' (with sewer placed at the 'h point
than 36" in the easement)

6-7