FLOOD09911

• County: Statewide
• Basin: Statewide
• Title: Culvert Design
• Date: 8/1/2000
• Prepared By: Ayres Associates
• Floodplain - Doc Type: Educational/Technical/Reference Information

Lesson 3

Culvert Design - Participant Workbook

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SLOPE.TAPERED INLETS

3.39 Slope-Tapered Example

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. SLOPE-TAPERED INLETS PROVIDE A
DEPRESSION OF THE INLET THAT APPLIES
MORE HEAD AT THE CONTROL SECTION

. CONTROL MAY OCCUR AT FACE OR THROAT

. THROAT CONTOl IS PREFERRABLE AND WILL
CAUSE MORE OF THE POTENTIAL CAPACITY
OF THE BARREL TO BE USED

3.38 Slope-Tapered Inlets

E. A third degree of improvement is a slope-tapered inlet. The advantage of
a slope-tapered inlet over a side-tapered inlet without a depression is that
more head is applied at the control (throat) section.

1. Both face and throat control are possible in a slope-tapered inlet;
however, since the major cost of a culvert is in the barrel portion
and not the inlet structure, the inlet face should be designed with
greater capacity at the allowable headwater elevation than the
throat.

2. This will insure flow control will be at the throat and more of the
potential capacity of the barrel will be used.

3.11 CULVERT DESIGN WITH HYDRAIN

A. HY8 module of HYDRAIN can be used to design culverts.

NOTES:

3-18

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