How should structural Best Management Practices (BMPs) be used?
A37. The final step in the hierarchy is to use more traditional structural BMPs such as wet and wetland detention basins to reduce flow rates and improve water quality. However, infiltration basins, infiltration trenches, and level spreaders also fall into this category and at the same time help to preserve the natural infiltration characteristics of the site if properly designed, constructed, and maintained. The final step of the hierarchy is the use of traditional dry bottom detention basins and storm sewers. In most cases, sites that only utilize the measures in this final step will not be accepted. Dry bottom detention basins and storm sewers may be appropriate on many sites but only when used in combination with the storm water mitigation techniques in the earlier steps.
