Line 12: Line 12:
 
<th>Time Period
 
<th>Time Period
 
<th>Level of Effort
 
<th>Level of Effort
<th>O&M Benefit
+
<th>O&M Benefit*
 +
<td>Check that there is no ponding in the pre-treatment device.
 +
<td>At least twice after storm events > 0.5 inches
 +
<td>Within the first 6 months
 +
<td>1-2 hours
 +
<td>1
 +
<td>Check for evidence of clogging in the pre-treatment device and/or in any conveyance structures
 +
<td>At least twice after storm events > 0.5 inches
 +
<td>Within the first 6 months
 +
<td>1-2 hours
 +
<td>1
 +
<td rowspan=2>Maintain proper water level for establishing vegetation (may require supplemental source)
 +
<td>1/week initially
 +
<td>During first 2 months
 +
<td>1-2 hours
 +
<td rowspan=2>2,3,4,5,6
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
<td>Check operation of mechanical parts like pumps
+
 
<td>At least twice after the system becomes operational
+
<td>As needed
<td>During a storm event
+
<td>First growing season
<td>2-4 hours
+
<td>1-2 hours
<td>1
 
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
<td>Check condition of first flush and high flow diverters
+
<td>Remove any stormwater diversion or barriers once seedlings are established.
<td>At least twice after storm events > 0.5 inches
+
<td>Once
<td>Within the first 6 months
+
<td>When plants are sufficiently established
 
<td>1-2 hours
 
<td>1-2 hours
<td>1
+
<td>1,2,3,4,5
 +
</tr>
 +
 
 +
<tr>
 +
<td>Install protective barriers (e.g. chicken wire) to protect growing vegetation from wildlife
 +
<td>As needed
 +
<td>First growing season
 +
<td>8 hours
 +
<td>1,2,3,5
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
<td>Check for clogging
+
<td>Check for signs of burrowing animals and incorporate gravel or rock in problem areas to discourage burrowing.
<td>At least twice after storm events > 0.5 inches
+
<td>As needed
<td>Within the first 6 months
+
<td>First growing season
 
<td>1-2 hours
 
<td>1-2 hours
 +
<td>5
 +
</tr>
 +
 +
<tr>
 +
<td>Check that water is moving as planned through the wetland. Identify and fix any stagnant zones.
 +
<td>As needed
 +
<td>During first 2 months
 +
<td>4 hours
 
<td>1
 
<td>1
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
<td>Check for erosion downstream of the high flow diverter
+
<td>Mow dikes frequently to establish deep rooted ground cover
<td>At least twice after storm events > 0.5 inches
+
<td>Biweekly or as needed
<td>Within the first 6 months
+
<td>First growing season
<td>1 hour
+
<td>
<td>1
+
<td>3,4
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
<td>Check for leaks
+
<td>Remove and replace dead plants
<td>At least twice after storm events > 0.5 inches
+
<td>As needed
<td>Within the first 6 months
+
<td>First growing season
<td>1 hour
+
<td>2-4 hours
<td>1
+
<td>2,3,4,5,6
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
<td>Check performance of water treatment system and adjust treatment parameters
+
<td>Spot reseeding of bare patches and eroding areas
<td>After tank has filled up
+
<td>As needed
<td>Within first month
+
<td>First growing season
<td>2 hours
+
<td>2-4 hours
<td>4
+
<td>1,2,3,4,5,6
 
</tr>
 
</tr>
  
Line 72: Line 102:
 
<th>Time Period
 
<th>Time Period
 
<th>Level of Effort per Visit
 
<th>Level of Effort per Visit
<th>O&M Benefit
+
<th>O&M Benefit*
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
<td>Inspect and clean pre screening devices and first flush diverters
+
<td>Check that there is no ponding in the pre-treatment device
<td>Quarterly
+
<td>Biannually
<td>Seasonally
+
<td>Any time when ground is not frozen
<td>2 hours
+
<td>1-2 hours
 
<td>1
 
<td>1
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
<td>Check and clean any filters to prevent clogging
+
<td>Check for evidence of clogging in the pre-treatment device and/or in any conveyance structures.
<td colspan=2>3 times per year and/or after each event that exceeds the design capacity of the collection system
+
<td>Biannually
 +
<td>In spring and fall
 
<td>1-2 hours
 
<td>1-2 hours
 
<td>1
 
<td>1
Line 91: Line 122:
  
 
<tr>
 
<tr>
<td>Remove leaves and debris from the gutters and downspouts
+
<td>Remove trash and debris from the pre-treatment device and/or in the main treatment area.
<td>Semi-annually
+
<td>Monthly
<td>Spring and Fall
+
<td>All year long
<td>2-4 hours
+
<td>1-2 hours
 +
<td>1,5
 +
</tr>
 +
 
 +
<tr>
 +
<td>Inspect for and remove excess sediment in the pre-treatment device and/or in the main treatment area.
 +
<td>Monthly
 +
<td>All year long
 +
<td>4 hours if removal is needed
 
<td>1
 
<td>1
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
<td>Clean out tank to remove sediment and algae
+
<td>Check and repair eroded areas
<td>Semi-annually
+
<td>Annually
<td>Spring and Fall
+
<td>In fall or spring when vegetation has died down
<td>4 hours
+
<td>4 hours if repairs are needed
<td>1,4
+
<td>1,2,3,4,5
 +
</tr>
 +
 
 +
<tr>
 +
<td>Weed and remove invasive plants
 +
<td>Twice during growing season
 +
<td>During growing season
 +
<td>1-2 hours
 +
<td>2,3,4,5
 +
</tr>
 +
 
 +
<tr>
 +
<td>Inspect plant composition and health and replace as needed to maintain >50% coverage.
 +
<td>Biannually
 +
<td>In fall or spring
 +
<td>4-8 hours, more if plant replacement is needed
 +
<td>2,3,4,5,6
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
<td>Check and repair damage to collection surface and collection tanks
+
<td>Remove woody vegetation on or near embankments, forebays, spillways, and outlets
 
<td>Annually
 
<td>Annually
<td>Spring or Fall
+
<td>In fall or spring
<td>2-4 hours
+
<td>4 hours
<td>1
+
<td>1,2,3,4,5,6
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
<td>Check and repair erosion along the diversion pathways
+
<td>Check for signs of burrowing animals and incorporate gravel or rock in problem areas to discourage burrowing.
<td>Annually
+
<td>As needed
<td>After large storm
+
<td>During growing season
 
<td>1-2 hours
 
<td>1-2 hours
 +
<td>1,2,5
 +
</tr>
 +
 +
<tr>
 +
<td>Inspect for and repair broken inlets, pipes, or other water control structures
 +
<td>Biannually
 +
<td>After high flows and ice breakup
 +
<td>2 hours, more if repairs are needed
 
<td>1
 
<td>1
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
<td>Check and repair any leaks
+
<td>Mow dikes and remove any shrubs or trees growing on dikes
<td>Annually
+
<td>As needed
<td>Spring or Fall
+
<td>During growing season
<td>2-4 hours
+
<td>1-2 hours
<td>1
+
<td>1,5
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
<td>Inspect and repair mosquito screens
+
<td>Monitor operating range of water level
<td>Annually
+
<td>Daily (collect data continuously, use information to diagnose issues)
<td>Spring or Fall
+
<td>Any time
 
<td>1-2 hours
 
<td>1-2 hours
<td>1
+
<td>1,2,4,6
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
<td>Clear overhanging vegetation and trees over roof
+
<td>Check that water is moving as planned through the wetland. Identify and fix any stagnant zones
 
<td>Annually
 
<td>Annually
<td>Winter
+
<td>During growing season
<td>
+
<td>4 hours
<td>1
+
<td>1,2,3,4,5
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
<td>Winterize or disconnect the storage system before the winter
+
<td>Inspect sediment accumulation in forebay and treatment areas. Remove if hydrology is impacted or if less than 50% of forebay capacity remains.
 
<td>Annually
 
<td>Annually
<td>Late Fall
+
<td>Fall
<td>Depends on system
+
<td>2 hours
<td>1
+
<td>1,4,6
 +
</tr>
 +
 
 +
<tr>
 +
<td>Harvest wetland plants
 +
<td>Once every 2-3 years
 +
<td>After growing season
 +
<td>4-8 hours
 +
<td>1,4,5,6
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
<td>Check structural integrity of tank, pump, pipe, and electrical system and repair any damages as needed
+
<td>Remove sediment from forebay
<td>Every 3 years
+
<td>Once every 2-7 years, or when less than 50% forebay capacity remains
<td>As convenient
+
<td>As needed
<td>Depends on repairs needed
+
<td>Varies
<td>1
+
<td>1,4,5,6
 
</tr>
 
</tr>
  
Line 167: Line 238:
  
 
<tr>
 
<tr>
<th>Activity
+
<thActivity
 
<th>Frequency
 
<th>Frequency
 
<th>Time Period
 
<th>Time Period
Line 175: Line 246:
  
 
<tr>
 
<tr>
<td>After long term operation of the practice, some occasional and infrequent maintenance activities might be required, such as replacement of structural materials, conveyance equipment, or storage tanks.  
+
<td>Remote inspection of all conveyance structures (e.g. pipes, underdrains, etc.)
 +
<td>Every 10 years
 +
<td>Any time
 +
<td>Varies
 +
<td>1
 +
</tr>
 +
 
 +
<tr>
 +
<td>After long term operation of the practice, some occasional and infrequent maintenance activities might be required, such as bigger repairs or redesign of key elements of the practice. Replacement of concrete components (e.g. pipes, risers, may be required after 25-50 years.  
 
<td>As needed
 
<td>As needed
 
<td>As needed
 
<td>As needed
 
<td>Could be significant depending on the activity
 
<td>Could be significant depending on the activity
<td>1,4
+
<td>1,2,3,4,5,6
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
<td colspan=5>Key to Maintenance Benefits:  
+
<td>Key to Maintenance Benefits:  
 
*Proper stormwater flow and infiltration
 
*Proper stormwater flow and infiltration
 
*Creation and maintenance of wildlife habitat
 
*Creation and maintenance of wildlife habitat
Line 190: Line 269:
 
*Aesthetics and public enjoyment
 
*Aesthetics and public enjoyment
 
*Carbon sequestration
 
*Carbon sequestration
</tr>
 
  
 
</table>
 
</table>

Revision as of 19:33, 20 August 2021

Overview and schedule of general maintenance activities for wetlands

Link to this table

<thActivity
First Year of Operation
Activity Frequency Time Period Level of Effort O&M Benefit* Check that there is no ponding in the pre-treatment device. At least twice after storm events > 0.5 inches Within the first 6 months 1-2 hours 1 Check for evidence of clogging in the pre-treatment device and/or in any conveyance structures At least twice after storm events > 0.5 inches Within the first 6 months 1-2 hours 1 Maintain proper water level for establishing vegetation (may require supplemental source) 1/week initially During first 2 months 1-2 hours 2,3,4,5,6
As needed First growing season 1-2 hours
Remove any stormwater diversion or barriers once seedlings are established. Once When plants are sufficiently established 1-2 hours 1,2,3,4,5
Install protective barriers (e.g. chicken wire) to protect growing vegetation from wildlife As needed First growing season 8 hours 1,2,3,5
Check for signs of burrowing animals and incorporate gravel or rock in problem areas to discourage burrowing. As needed First growing season 1-2 hours 5
Check that water is moving as planned through the wetland. Identify and fix any stagnant zones. As needed During first 2 months 4 hours 1
Mow dikes frequently to establish deep rooted ground cover Biweekly or as needed First growing season 3,4
Remove and replace dead plants As needed First growing season 2-4 hours 2,3,4,5,6
Spot reseeding of bare patches and eroding areas As needed First growing season 2-4 hours 1,2,3,4,5,6
After First Year of Operation
Activity Frequency Time Period Level of Effort per Visit O&M Benefit*
Check that there is no ponding in the pre-treatment device Biannually Any time when ground is not frozen 1-2 hours 1
Check for evidence of clogging in the pre-treatment device and/or in any conveyance structures. Biannually In spring and fall 1-2 hours 1
Remove trash and debris from the pre-treatment device and/or in the main treatment area. Monthly All year long 1-2 hours 1,5
Inspect for and remove excess sediment in the pre-treatment device and/or in the main treatment area. Monthly All year long 4 hours if removal is needed 1
Check and repair eroded areas Annually In fall or spring when vegetation has died down 4 hours if repairs are needed 1,2,3,4,5
Weed and remove invasive plants Twice during growing season During growing season 1-2 hours 2,3,4,5
Inspect plant composition and health and replace as needed to maintain >50% coverage. Biannually In fall or spring 4-8 hours, more if plant replacement is needed 2,3,4,5,6
Remove woody vegetation on or near embankments, forebays, spillways, and outlets Annually In fall or spring 4 hours 1,2,3,4,5,6
Check for signs of burrowing animals and incorporate gravel or rock in problem areas to discourage burrowing. As needed During growing season 1-2 hours 1,2,5
Inspect for and repair broken inlets, pipes, or other water control structures Biannually After high flows and ice breakup 2 hours, more if repairs are needed 1
Mow dikes and remove any shrubs or trees growing on dikes As needed During growing season 1-2 hours 1,5
Monitor operating range of water level Daily (collect data continuously, use information to diagnose issues) Any time 1-2 hours 1,2,4,6
Check that water is moving as planned through the wetland. Identify and fix any stagnant zones Annually During growing season 4 hours 1,2,3,4,5
Inspect sediment accumulation in forebay and treatment areas. Remove if hydrology is impacted or if less than 50% of forebay capacity remains. Annually Fall 2 hours 1,4,6
Harvest wetland plants Once every 2-3 years After growing season 4-8 hours 1,4,5,6
Remove sediment from forebay Once every 2-7 years, or when less than 50% forebay capacity remains As needed Varies 1,4,5,6
After 5+ Years of Operation (non-routine maintenance)
Frequency Time Period Level of Effort per Visit O&M Benefit*
Remote inspection of all conveyance structures (e.g. pipes, underdrains, etc.) Every 10 years Any time Varies 1
After long term operation of the practice, some occasional and infrequent maintenance activities might be required, such as bigger repairs or redesign of key elements of the practice. Replacement of concrete components (e.g. pipes, risers, may be required after 25-50 years. As needed As needed Could be significant depending on the activity 1,2,3,4,5,6
Key to Maintenance Benefits:
  • Proper stormwater flow and infiltration
  • Creation and maintenance of wildlife habitat
  • Creation and maintenance of pollinator habitat
  • Nutrient cycling and storage
  • Aesthetics and public enjoyment
  • Carbon sequestration