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<td>Bi‐monthly April through October</td> | <td>Bi‐monthly April through October</td> | ||
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− | <td rowspan=2>Pretreatment</td> | + | <td rowspan=2>'''Pretreatment'''</td> |
<td>Pretreatment screens or sumps reach capacity</td> | <td>Pretreatment screens or sumps reach capacity</td> | ||
<td>Remove sediment and oil/grease from pretreatment devices/structures</td> | <td>Remove sediment and oil/grease from pretreatment devices/structures</td> |
Typical maintenance problems and activities for stormwater step pools
Link to this table
Inspection Focus | Common Maintenance Problems | Maintenance Activity | Recommended Maintenance Schedule |
---|---|---|---|
Drainage Area and Drawdown Time | Clogging, sediment deposition | Ensure that contributing catchment areas to practice and inlets are clear of debris | Monthly |
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 | |
Site Erosion | Scouring at inlets | Correct earthwork to promote non‐erosive flows that are evenly distributed | As necessary |
Unexpected flow paths into practice | Correct earthwork to eliminate unexpected drainage or created additional stable inlets as necessary | As necessary | |
Vegetation | Reduced drawdown time damaging plants | Correct drainage issues as described above | Replace with appropriate plants after correction of drainage issues |
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 | |
Vegetative cover | Add seed/plants to maintain ≥95% vegetative cover. | Bi‐monthly April through October | |
Pretreatment | Pretreatment screens or sumps reach capacity | Remove sediment and oil/grease from pretreatment devices/structures | Minimum yearly or as per manufacturer's recommendations |
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 |