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Line 11: − + − Additional components include an underdrain to remove excess water and surface drains to safely convey flows in excess of the storage capacity of the design.
→Design Assumptions
===Design Assumptions===
===Design Assumptions===
Porous asphalt is ideal for sites with limited space and projects such as low traffic roads, parking lots, driveways and walkways. Components include: a porous asphalt surface, a stabilizing base layer of aggregate, and a sub-base layer of aggregate for water storage.
Porous asphalt is ideal for sites with limited space and projects such as low traffic roads, parking lots, driveways and walkways. Components include: a porous asphalt surface, a stabilizing base aggregate layer, and a sub-base aggregate layer (or stone reservoir) for water storage. Optional components include an underdrain to remove excess water, flow restrictor to control the release rate of the facility, and surface drains to safely convey flows in excess of the storage capacity of the design.
Design and operation and maintenance program assumptions used to generate cost estimates are based on tool default values and the following STEP recommendations:
Design and operation and maintenance program assumptions used to generate cost estimates are based on tool default values and the following STEP recommendations: