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− | <font size=3>'''Typical | + | <font size=3>'''Typical temporary stream crossing methods and their applicability'''.</font size><br> |
− | Link to this [[Typical | + | Link to this [[Typical temporary stream crossing methods and their applicability|table]] |
<table class="sortable"> | <table class="sortable"> | ||
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*Generally most appropriate for streams with high flow velocities or steep gradients | *Generally most appropriate for streams with high flow velocities or steep gradients | ||
</td> | </td> | ||
− | <td>Use in large channels may require pier(s) or other supports, which increase disturbance to stream (see [https://stormwater.pca.state.mn.us/index.php?title=Construction_stormwater_practices_-_temporary_stream_crossing#Construction_recommendations_and_specifications Construction recommendations and specifications]) | + | <td>Use in large channels may require pier(s) or other supports, which increase disturbance to stream (see [https://stormwater.pca.state.mn.us/index.php?title=Construction_stormwater_practices_-_temporary_stream_crossing#Construction_recommendations_and_specifications Construction recommendations and specifications])</td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
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*Most common temporary stream crossing | *Most common temporary stream crossing | ||
*Most appropriate for short-term use | *Most appropriate for short-term use | ||
− | *Generally appropriate for perennial or intermittent streams | + | *Generally appropriate for perennial or <span title="a well-defined channel that contains. water for only part of the year, typically during winter and spring when the aquatic."> '''intermittent streams'''</span> |
*Generally preferred over fords as disturbance to stream is limited to construction and removal | *Generally preferred over fords as disturbance to stream is limited to construction and removal | ||
</td> | </td> | ||
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*Causes greatest obstruction to flow | *Causes greatest obstruction to flow | ||
*May damage channel cross-section; culvert crossings should be planned to limit the number of crossings needed | *May damage channel cross-section; culvert crossings should be planned to limit the number of crossings needed | ||
− | *Not appropriate for streams that are vertically degraded or incised | + | *Not appropriate for streams that are vertically degraded or <span title="A stream channel in which the bed has dropped and as a result, the stream is disconnected from its floodplain. Incised channels are often referred to as degraded channels."> '''incised'''</span> |
</td> | </td> | ||
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<td>Temporary ford (drive-through)</td> | <td>Temporary ford (drive-through)</td> | ||
<td> | <td> | ||
− | *Most appropriate for short-term use | + | *Most appropriate for short-term use |
− | *Generally appropriate for ephemeral or low flow perennial streams | + | *Generally appropriate for <span title="a stream that flows only briefly during and following a period of rainfall in the immediate locality."> '''ephemeral'''</span> or low flow perennial streams |
− | *Used when bridge or culvert crossings are not feasible; typically very shallow streams where stream banks are less than 4 feet above the stream invert | + | *Used when bridge or culvert crossings are not feasible; typically very shallow streams where stream banks are less than 4 feet above the stream invert |
</td> | </td> | ||
<td> | <td> | ||
− | *Use should be limited to dry season | + | *Use should be limited to dry season |
− | *Use should be limited to streams whose beds are armored | + | *Use should be limited to streams whose beds are armored |
*May degrade water quality due to contact with construction vehicles and equipment | *May degrade water quality due to contact with construction vehicles and equipment | ||
</td> | </td> | ||
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<noinclude> | <noinclude> | ||
− | [[ | + | [[Category:Level 3 - General information, reference, tables, images, and archives/Tables/Erosion prevention]] |
</noinclude> | </noinclude> |
Typical temporary stream crossing methods and their applicability.
Link to this table
Stream crossing type | Applicability | Limitations |
---|---|---|
Temporary bridge |
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Use in large channels may require pier(s) or other supports, which increase disturbance to stream (see Construction recommendations and specifications) |
Temporary culvert (pipe) |
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Temporary ford (drive-through) |
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This page was last edited on 24 July 2022, at 15:01.