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<td>Partial stream diversion</td> | <td>Partial stream diversion</td> | ||
− | <td>*Suitable when work area is on one side of the stream channel or stream bank. | + | <td> |
+ | *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. | ||
</td> | </td> | ||
− | <td>*Not easily moved or adjusted after installation. | + | <td> |
+ | *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. | ||
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<td>Diversion channels/ditches</td> | <td>Diversion channels/ditches</td> | ||
− | <td>*Most appropriate for short duration projects with low baseflows. | + | <td> |
+ | *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. | ||
</td> | </td> | ||
− | <td>*Not easily moved or adjusted after installation. | + | <td> |
+ | *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> | ||
− | <td>*Most appropriate for short duration projects with low baseflows. | + | <td> |
+ | *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. | ||
</td> | </td> | ||
− | <td>*Construction equipment cannot be driven over pipes. | + | <td> |
+ | *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. | ||
</td> | </td> | ||
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<td>Pumped diversions (“pump-arounds”)</td> | <td>Pumped diversions (“pump-arounds”)</td> | ||
− | <td>*Most appropriate for short duration projects with low baseflows. | + | <td> |
+ | *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> | ||
− | <td>*Limited by pump capacity, and continuous pumping can be costly. | + | <td> |
+ | *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. | ||
</td> | </td> | ||
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</table> | </table> |
Typical diversion methods for working in the dry and their applicability.
Link to this table
Diversion practice | Applicability | Limitations |
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Partial stream diversion |
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Diversion channels/ditches |
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Piped diversions/ culverts (bypass pipe) |
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Pumped diversions (“pump-arounds”) |
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