Typical maintenance problems and activities for wet swales
Link to this table

Inspection Focus Common Maintenance Problems Maintenance Activity Recommended Maintenance Schedule
Drainage Area 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. Bi‐monthly April through October
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 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

This page was last edited on 15 April 2020, at 16:35.