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

This page was last modified on 21 September 2016, at 07:54.

Minnesota Pollution Control Agency | 651-296-6300, 800-657-3864 | Assistance | Web site policy