https://epg.modot.org/index.php?title=771.8_Remove_Drift&feed=atom&action=history
771.8 Remove Drift - Revision history
2024-03-28T17:41:21Z
Revision history for this page on the wiki
MediaWiki 1.33.1
https://epg.modot.org/index.php?title=771.8_Remove_Drift&diff=38513&oldid=prev
Smithk at 14:56, 22 November 2016
2016-11-22T14:56:24Z
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<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[[Category:771 Bridge <del class="diffchange diffchange-inline">Preventative </del>Maintenance Guidelines|771.08]]</div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>[[Category:771 Bridge <ins class="diffchange diffchange-inline">Preventive </ins>Maintenance Guidelines|771.08]]</div></td></tr>
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Smithk
https://epg.modot.org/index.php?title=771.8_Remove_Drift&diff=19309&oldid=prev
Tschid: Updated activity code
2008-12-31T19:34:27Z
<p>Updated activity code</p>
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 19:34, 31 December 2008</td>
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Tschid
https://epg.modot.org/index.php?title=771.8_Remove_Drift&diff=15996&oldid=prev
Tschid: 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
<p>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...</p>
<p><b>New page</b></p><div>{|style="padding: 0.3em; margin-left:15px; border:1px solid #a9a9a9; text-align:center; font-size: 95%; background:#f5f5f5" width="160px" align="right" <br />
|- <br />
|'''Code:''' R316<br />
|}<br />
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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.<br />
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==Procedures==<br />
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.<br />
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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.<br />
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3. Drift should not be placed under the bridge.<br />
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==Safety==<br />
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.<br />
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==Photographs==<br />
{|<br />
|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.'''<br />
|-<br />
|text align="center"|[[Image:771.8 Remove Drift1.jpg]]<br />
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|text align="center"|[[Image:771.8 Remove Drift2.jpg]]<br />
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|text align="center"|'''If the drift is not removed the results can be very dramatic.'''<br />
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|text align="center"|[[Image:771.8 Remove Drift3.jpg]]<br />
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|text align="center"|'''After noting the drift on inspection the drift was removed and the area repaired.'''<br />
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|text align="center"|[[Image:771.8 Remove Drift4.jpg]]<br />
|}<br />
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[[Category:771 Bridge Preventative Maintenance Guidelines|771.08]]</div>
Tschid