Levels of assessment for stormwater best management practices (stormwater control measures) Levels of assessment for stormwater best management practices (stormwater control measures)

Levels of assessment for stormwater best management practices (stormwater control measures)
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Level	Title	Objectives	Relative	Typical elapsed time	Advantages	Disadvantages
1	Visual Inspection	Determine if stormwater BMP is malfunctioning	1	1 day	Quick, inexpensive	Limited knowledge gained
2	Capacity testing	Determine infiltration or sedimentation capacity and rates	10	1 week	Less expensive, no equipment left in field	Limited to infiltration and sedimentation capacity/rates, uncertainties can be substantial
3	Simulated runoff testing	Determine infiltration rates, capacity, and pollutant removal performance	10-100	1 week to 1 month	Controlled experiments, more accurate with fewer tests required for statistical significance as compared to monitoring, no equipment left in field	Cannot be used without sufficient water supply, limited scope
4	Monitoring	Determine infiltration rates, capacity, and pollutant removal performance	400	14 months	Most comprehensive. Assess stormwater BMP within watershed without modeling	Uncertainty in results due to lack of control and number of variables, equipment left in field