− | 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. | + | 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 course layers. |