m
m
Line 1: Line 1:
<center><font size=3>'''Typical maintenance problems and activities for infiltration practices'''</font size><br>
+
<font size=3>'''Typical maintenance problems and activities for infiltration practices'''</font size><br>
 
+
Link to this [[Typical maintenance problems and activities for infiltration practices|table]]
Link to this [[Typical maintenance problems and activities for infiltration practices|table]]</center>
 
  
 
<table class="sortable">
 
<table class="sortable">
Line 20: Line 19:
 
<tr>
 
<tr>
 
<td>Erosion of catchment area contributing significant amount of sediment</td>
 
<td>Erosion of catchment area contributing significant amount of sediment</td>
<td>In case of severely reduced drawdown time, scrape bottom of basin and remove sediment. Disc or otherwise aerate/scarify basin bottom. Dethatch if basin bottom is turf grass. Restore original design cross section or revise section to increase infiltration rate and restore with vegetation as necessary.</td>
+
<td>In case of severely reduced drawdown time, scrape bottom of basin and remove sediment. Disc or otherwise aerate/scarify basin bottom. De-thatch if basin bottom is turf grass. Restore original design cross section or revise section to increase infiltration rate and restore with vegetation as necessary.</td>
 
<td>Upon identification of drawdown times longer than 48 hours or upon complete failure</td>
 
<td>Upon identification of drawdown times longer than 48 hours or upon complete failure</td>
 
<td>1,2,3,4,5,6</td>
 
<td>1,2,3,4,5,6</td>
Line 46: Line 45:
 
<tr>
 
<tr>
 
<td>Unexpected flow paths into practice</td>
 
<td>Unexpected flow paths into practice</td>
<td>Correct earthwork to eliminate unepxected drainage or created additional stabile inlets as necessary</td>
+
<td>Correct earthwork to eliminate unexpected drainage or created additional stable inlets as necessary</td>
 
<td>As necessary</td>
 
<td>As necessary</td>
 
<td>1,2,3,6</td>
 
<td>1,2,3,6</td>
Line 59: Line 58:
 
<tr>
 
<tr>
 
<td>Severe weed establishment</td>
 
<td>Severe weed establishment</td>
<td>Limit the ability for noxious weed establishment by properly mowing, mulching or timely herbicide or handweeding. Refer to the MDA Noxious Weed List</td>
+
<td>Limit the ability for noxious weed establishment by properly mowing, mulching or timely herbicide or hand weeding. Refer to the [http://www.mda.state.mn.us/plants/pestmanagement/weedcontrol/noxiouslist.aspx MDA Noxious Weed List]</td>
<td>Bi‐Monthly April through October</td>
+
<td>Bi‐monthly April through October</td>
 
<td>2,6,8</td>
 
<td>2,6,8</td>
 
</tr>
 
</tr>
 
</table>
 
</table>
  
<font size=1><sup>1</sup>
+
<font size=1><sup>1</sup>1=Infiltration Basin; 2=Bioinfiltration Basin; 3=Infiltration Trench; 4=Dry Well; 5=Underground Infiltration; 6=Dry Swale with Check Dams; 7=Permeable Pavement; 8=Tree Trench/Tree Box</font size>
#Infiltration Basin
 
#Bioinfiltration Basin
 
#Infiltration Trench
 
#Dry Well
 
#Underground Infiltration
 
#Dry Swale with Check Dams
 
#Permeable Pavement
 
#Tree Trench/Tree Box
 
</font size>
 
  
  
 
[[category:Table]]
 
[[category:Table]]

Revision as of 12:53, 21 September 2016

Typical maintenance problems and activities for infiltration practices
Link to this table

Inspection Focus Common Maintenance Problems Maintenance Activity Recommended Maintenance Schedule Applicable Infiltration Practices1
'Drainage Area and Drawdown Time' Clogging, sediment deposition Ensure that contributing catchment areas to practice, and inlets are clear of debris Monthly 1,2,3,4,5,6,7
Erosion of catchment area contributing significant amount of sediment In case of severely reduced drawdown time, scrape bottom of basin and remove sediment. Disc or otherwise aerate/scarify basin bottom. De-thatch if basin bottom is turf grass. Restore original design cross section or revise section to increase infiltration rate and restore with vegetation as necessary. Upon identification of drawdown times longer than 48 hours or upon complete failure 1,2,3,4,5,6
'Pretreatment' Pretreatment screens or sumps reach capacity Remove sediment and oil/grease from pretreatment devices/structures. Minimum yearly or as per manufacturer's recommendations 1,2,3,4,5
Vegetative filter strip failure Reduce height of vegetative filter strip that may be limiting in‐flow. Re‐establish vegetation to prevent erosion. Leave practice off‐line until full reestablishment. Mow grass filter strips monthly. Restore as necessary 1,2,4,6
'Site Erosion' Scouring at inlets Correct earthwork to promote non‐erosive flows that are evenly distributed As necessary 1,2,3,6
Unexpected flow paths into practice Correct earthwork to eliminate unexpected drainage or created additional stable inlets as necessary As necessary 1,2,3,6
'Vegetation Reduced drawdown time damaging plants Correct drainage issues as described above Replace with appropriate plants after correction of drainage issues 2,6,8
Severe weed establishment Limit the ability for noxious weed establishment by properly mowing, mulching or timely herbicide or hand weeding. Refer to the MDA Noxious Weed List Bi‐monthly April through October 2,6,8

11=Infiltration Basin; 2=Bioinfiltration Basin; 3=Infiltration Trench; 4=Dry Well; 5=Underground Infiltration; 6=Dry Swale with Check Dams; 7=Permeable Pavement; 8=Tree Trench/Tree Box