. Alewife Reservation & Alewife Brook master plan. Wetlands; Wetland conservation. Asphalt Path Asphalt (bituminous concrete) is a hard sur- face that accommodates pedestrians, bicycles, wheelchairs, strollers, and in-line skates. As- phalt paths can also be designed to withstand emergency and maintenance vehicles. The gen- erous width of these paths (10-12 feet) allows for two-way traffic. Generally the asphalt surface is impervious, but porous formulations are available and can be useful in decreasing runoff. Biofiltration swales parallel to the path or leading from the path to larger bi
. Alewife Reservation & Alewife Brook master plan. Wetlands; Wetland conservation. Asphalt Path Asphalt (bituminous concrete) is a hard sur- face that accommodates pedestrians, bicycles, wheelchairs, strollers, and in-line skates. As- phalt paths can also be designed to withstand emergency and maintenance vehicles. The gen- erous width of these paths (10-12 feet) allows for two-way traffic. Generally the asphalt surface is impervious, but porous formulations are available and can be useful in decreasing runoff. Biofiltration swales parallel to the path or leading from the path to larger biofiltration basins will also be used to retain and treat stormwater. This configuration is suitable along the Alewife Brook Parkway to improve or replace the existing sidewalks. Stabilised Aggregate Path This path type is 8—10 feet wide and uses stone dust, crushed stone aggregate (or decomposed granite) and an organic binder to create a semi-porous, stable surface. The path surface is accessible to wheelchairs. The path is semi- permeable and thus most desirable from a stormwater management standpoint. The path usually blends in well with the natural environ- ment. Successful installations of this material type occur on the Minuteman Trail (see Figure 33) and on certain sections of the Fresh Pond Perimeter Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bioengineering Group; Massachusetts. Metropolitan District Commission; Carol R. Johnson & Associates. [Salem, Mass. ] : The Bioengineering Group
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