Infiltration Systems Longevity
3 studies in Maryland indicate poor to moderate longevity of first generation infiltration systems
Infiltration basins had poorest longevity (100% failure)
Infiltration trenches
- about 20% failed initially
- additional 30% failed within 5 years of construction
- most trenches were never maintained
- grass filter strips, alone, are inadequate pretreatment
- sump pit pretreatment appeared useful
Notes:
Infiltration practices have a tendency to clog and fail in short periods of time. This is usually the result of inadequate pretreatment and limited or no maintenance. Before implementation of infiltration practices, designers and reviewers should be aware of some of the pitfalls associated with the practices, as outlined in these final two slides.