− | As can be seen, regardless of outlet configuration, Material & Installation expenses represent the largest portion of the total construction costs (74 to 77%). These include costly components such as the, [[Liner|impermeable membrane/liner]], the [[underdrain]], the [[Permeable pavements#Foundation Aggregates|porous asphalt sub-base]] of 50mm [[clear stone]], the conventional asphalt base course (stone reservoir) of 230mm Granular A, [[clear stone|the 19mm Stabilizing course]] and the [[Permeable pavements: Specifications|asphalt (both conventional and permeable)]]. | + | As can be seen, regardless of outlet configuration, Material & Installation expenses represent the largest portion of the total construction costs (74 to 77%). These include costly components such as the [[Liner|impermeable membrane/liner]], [[underdrain]], [[Permeable pavements#Foundation Aggregates|sub-base layer]] of 50 mm dia. [[clear stone]], [[Permeable pavements#Foundation Aggregates|base layer]] of 19 mm dia. [[clear stone]], and porous and standard asphalt surface coarse layers. |