Inspection of Stormwater Controls for Better Performance
- Ryan O’Banion - Hazen and Sawyer
- Karlee Copeland - Fairfax County, VA
To comply with conditions of a VPDES Phase I MS4 Stormwater Discharge Permit, Fairfax County, Virginia, inspects approximately 20% of its inventory of privately maintained stormwater controls every year. In support of this permit condition, comprehensive inspections were conducted for more than 500 constructed stormwater facilities, representing a combination of green infrastructure practices and conventional stormwater controls.
Inspection services are characterized by three phases: pre-inspection data collection, field inspections, and remediation and reporting. Hazen and Fairfax County worked together to compile the inspection reporting results into a database for analysis. Using this database, a number of key maintenance issues were consistently identified across the varying types of stormwater controls.
Preliminary findings suggest that the most frequent maintenance items across the multitude of stormwater controls include: insufficient or incorrect vegetation, insufficient mulch layers, bare spots or erosion, and trash, sediment, or debris. These findings and inspection methodologies can help other inspectors, designers, and municipalities ensure stormwater controls continue to function as designed.
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