Smithk at 14:56, 22 November 2016

2016-11-22T14:56:24Z

← Older revision		Revision as of 09:56, 22 November 2016
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	[[Category:771 Bridge ~~Preventative~~ Maintenance Guidelines\|771.08]]		[[Category:771 Bridge Preventive Maintenance Guidelines\|771.08]]

EPG-Admin: Updated activity code

2008-12-31T19:34:27Z

Updated activity code

← Older revision		Revision as of 14:34, 31 December 2008
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	{\|style="padding: 0.3em; margin-left:15px; border:1px solid #a9a9a9; text-align:center; font-size: 95%; background:#f5f5f5" width="160px" align="right"		{\|style="padding: 0.3em; margin-left:15px; border:1px solid #a9a9a9; text-align:center; font-size: 95%; background:#f5f5f5" width="160px" align="right"
	\|-		\|-
	\|'''Code:''' ~~R316~~		\|'''Code:''' R327
	\|}		\|}

EPG-Admin: New page: {|style="padding: 0.3em; margin-left:15px; border:1px solid #a9a9a9; text-align:center; font-size: 95%; background:#f5f5f5" width="160px" align="right" |- |'''Code:''' R316 |} Drift is...

2007-12-21T20:23:25Z

New page: {|style="padding: 0.3em; margin-left:15px; border:1px solid #a9a9a9; text-align:center; font-size: 95%; background:#f5f5f5" width="160px" align="right" |- |'''Code:''' R316 |} Drift is...

New page

{|style="padding: 0.3em; margin-left:15px; border:1px solid #a9a9a9; text-align:center; font-size: 95%; background:#f5f5f5" width="160px" align="right"
|-
|'''Code:''' R316
|}

Drift is removed to eliminate obstructions that could cause erosion and affect the stability of the structure. Drift is also a fire hazard. Drift in areas that are accessible without entering the water can be removed anytime. Drift that can be safely reached with equipment during high stream flows can be removed or redirected during the flood stages. Drift in water may have to be removed in summer months when streams are at their lowest levels.

==Procedures==
1. Drift removal methods and equipment vary from one site to another. Each site will have to be reviewed for factors such as access, size of drift pile, stream flow and depth, and others to determine the method and equipment needed for removal. Examples of possible methods and equipment include; a dragline or boom truck with clamshell bucket, backhoe or track hoe, automobile wreckers, and cable winches.

2. The drift needs to be removed from drainage area or trimmed in small enough pieces as to not pose future drift problems on downstream structures.

3. Drift should not be placed under the bridge.

==Safety==
Water of unknown depths and hazards, utilities in the area, size of the drift, using chainsaws and other tools to trim the drift, overhead equipment with winches and cables.

==Photographs==
{|
|text align="center"|'''Channels due to erosion and clearing of farmland collect drift that may be caught by a bridge support in or near the stream.'''
|-
|text align="center"|[[Image:771.8 Remove Drift1.jpg]]
|-
|text align="center"|[[Image:771.8 Remove Drift2.jpg]]
|-
|text align="center"|'''If the drift is not removed the results can be very dramatic.'''
|-
|text align="center"|[[Image:771.8 Remove Drift3.jpg]]
|-
|text align="center"|'''After noting the drift on inspection the drift was removed and the area repaired.'''
|-
|text align="center"|[[Image:771.8 Remove Drift4.jpg]]
|}

[[Category:771 Bridge Preventative Maintenance Guidelines|771.08]]

771.8 Remove Drift - Revision history

Smithk at 14:56, 22 November 2016

EPG-Admin: Updated activity code

EPG-Admin: New page: {|style="padding: 0.3em; margin-left:15px; border:1px solid #a9a9a9; text-align:center; font-size: 95%; background:#f5f5f5" width="160px" align="right" |- |'''Code:''' R316 |} Drift is...