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Minnesota Stormwater Manual

Difference between revisions of "Typical diversion methods for working in the dry and their applicability"

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<td>Partial stream diversion</td>
 
<td>Partial stream diversion</td>
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<td>*Suitable when work area is on one side of the stream channel or stream bank.
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*Suitable when work area is on one side of the stream channel or stream bank.
 
*Appropriate stream size and duration of use depends on materials.
 
*Appropriate stream size and duration of use depends on materials.
 
*Structures are placed in the stream to confine flow to one side while work progresses on the “dry” side.
 
*Structures are placed in the stream to confine flow to one side while work progresses on the “dry” side.
 
*Sand bags, stone, or similar diversions are appropriate for smaller streams and work areas, while coffer dams, portable dams, or other similar barriers are necessary for larger water bodies.
 
*Sand bags, stone, or similar diversions are appropriate for smaller streams and work areas, while coffer dams, portable dams, or other similar barriers are necessary for larger water bodies.
 
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<td>*Not easily moved or adjusted after installation.
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*Not easily moved or adjusted after installation.
 
*Sand bag or stone in-channel diversions are typically not appropriate for larger streams.
 
*Sand bag or stone in-channel diversions are typically not appropriate for larger streams.
 
*May be subject to failure or erosion during storm events.
 
*May be subject to failure or erosion during storm events.
 
*Results in a smaller area of stream access compared to other diversion methods.
 
*Results in a smaller area of stream access compared to other diversion methods.
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*See Diversion barrier controls (cofferdams/ temporary dikes) for more information
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*[https://stormwater.pca.state.mn.us/index.php?title=Sediment_control_practices_-_Diversion_barrier_controls_(cofferdams/temporary_dikes) See Diversion barrier controls (cofferdams/ temporary dikes)] for more information
 
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<td>Diversion channels/ditches</td>
 
<td>Diversion channels/ditches</td>
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<td>*Most appropriate for short duration projects with low baseflows.
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*Most appropriate for short duration projects with low baseflows.
 
*Requires sufficient area in the stream corridor to construct the diversion channel.
 
*Requires sufficient area in the stream corridor to construct the diversion channel.
 
*Requires a positive slope to allow flow through the channel.
 
*Requires a positive slope to allow flow through the channel.
 
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</td>
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<td>*Not easily moved or adjusted after installation.
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*Not easily moved or adjusted after installation.
 
*Insufficient flow capacity in pipe can cause diversion failure and severe erosion.
 
*Insufficient flow capacity in pipe can cause diversion failure and severe erosion.
 
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<td>Piped diversions/ culverts (bypass pipe)</td>
 
<td>Piped diversions/ culverts (bypass pipe)</td>
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<td>*Most appropriate for short duration projects with low baseflows.
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<td>
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*Most appropriate for short duration projects with low baseflows.
 
*Appropriate when the required flow diversion can be accomplished without pumping.
 
*Appropriate when the required flow diversion can be accomplished without pumping.
 
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</td>
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<td>*Construction equipment cannot be driven over pipes.
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<td>
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*Construction equipment cannot be driven over pipes.
 
*Insufficient flow capacity in pipe can cause diversion failure and severe erosion.
 
*Insufficient flow capacity in pipe can cause diversion failure and severe erosion.
 
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<td>Pumped diversions (“pump-arounds”)</td>
 
<td>Pumped diversions (“pump-arounds”)</td>
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<td>*Most appropriate for short duration projects with low baseflows.
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<td>
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*Most appropriate for short duration projects with low baseflows.
 
*Typically used when there is limited space for a diversion.
 
*Typically used when there is limited space for a diversion.
 
*Pump(s) must be sized to accommodate stream baseflow.
 
*Pump(s) must be sized to accommodate stream baseflow.
 
</td>
 
</td>
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<td>*Limited by pump capacity, and continuous pumping can be costly.
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<td>
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*Limited by pump capacity, and continuous pumping can be costly.
 
*Pump failure can result in delays and additional costs.
 
*Pump failure can result in delays and additional costs.
 
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[[Category:Level 3 - General information, reference, tables, images, and archives/Tables/Erosion prevention]]
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</noinclude>

Latest revision as of 15:01, 24 July 2022

Typical diversion methods for working in the dry and their applicability.
Link to this table

Diversion practice Applicability Limitations
Partial stream diversion
  • Suitable when work area is on one side of the stream channel or stream bank.
  • Appropriate stream size and duration of use depends on materials.
  • Structures are placed in the stream to confine flow to one side while work progresses on the “dry” side.
  • Sand bags, stone, or similar diversions are appropriate for smaller streams and work areas, while coffer dams, portable dams, or other similar barriers are necessary for larger water bodies.
  • Not easily moved or adjusted after installation.
  • Sand bag or stone in-channel diversions are typically not appropriate for larger streams.
  • May be subject to failure or erosion during storm events.
  • Results in a smaller area of stream access compared to other diversion methods.
  • See Diversion barrier controls (cofferdams/ temporary dikes) for more information
Diversion channels/ditches
  • Most appropriate for short duration projects with low baseflows.
  • Requires sufficient area in the stream corridor to construct the diversion channel.
  • Requires a positive slope to allow flow through the channel.
  • Not easily moved or adjusted after installation.
  • Insufficient flow capacity in pipe can cause diversion failure and severe erosion.
Piped diversions/ culverts (bypass pipe)
  • Most appropriate for short duration projects with low baseflows.
  • Appropriate when the required flow diversion can be accomplished without pumping.
  • Construction equipment cannot be driven over pipes.
  • Insufficient flow capacity in pipe can cause diversion failure and severe erosion.
Pumped diversions (“pump-arounds”)
  • Most appropriate for short duration projects with low baseflows.
  • Typically used when there is limited space for a diversion.
  • Pump(s) must be sized to accommodate stream baseflow.
  • Limited by pump capacity, and continuous pumping can be costly.
  • Pump failure can result in delays and additional costs.
Retrieved from "https://stormwater.pca.state.mn.us/index.php?title=Typical_diversion_methods_for_working_in_the_dry_and_their_applicability&oldid=59559"

This page was last edited on 24 July 2022, at 15:01.