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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2.

4.

Concrete Materials (Major Drainageway)

a. Cement type: Sulphate resistant (Type V).
b. Minimum cement content: 550 lbs/CY

c. Maximum water content: 0.50 (six gallons per sack)

d. Maximum aggregate size: 1\ inches
e. Air content range: 4% to 7%

f. Slump: 2 to 4 inches

g. Minimum compressive strength (f'c): 3,750 psi @ 28 days

3.

Concrete Lining section (Major Drainageway)

a. All concrete lining shall have a minimum thickness of 7
inches.

b. The side slopes shall be a maximum of 2 vertical to 1
horizontal, or be designed as a structurally reinforced
retaining wall, if steeper.

Concrete Joints (Major Drainageway)

a. Channels shall be continuously reinforced with transverse
joints. Expansion joints shall be installed where new
concrete lining is connected to a rigid structure or to
an existing concrete lining which is not continuously
reinforced.

b. Longitudinal joints, where required, shall be constructed
on the side walls at least one foot vertically above the
channel invert.

c. All joints shall be designed to prevent differential
movement.

d.

Construction joints are required for
where the lining thickness changes.
be continuous through the joint.

all cold joints and
Reinforcement shall

5.

Concrete Finish (Major Drainageway)

The surface of the
wood float finish.
shall be avoided.

concrete lining shall be provided with a
Excessive working or wetting of the finish

6.

Concrete Curing (Major Drainageway)

All concrete shall be cured by the
membrane forming curing compound
completion of the concrete finish.

application of a liquid
(white pigmented) upon

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