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Systems should be located below shoulders of roadways, [[permeable pavements]] or [[swales]] where they can be readily excavated for servicing. An adequate subsurface area outside of the 4 m setback from building foundations and suitable distance from other underground utilities must be available.
Systems should be located below shoulders of roadways, [[permeable pavements]] or [[swales]] where they can be readily excavated for servicing. An adequate subsurface area outside of the 4 m setback from building foundations and suitable distance from other underground utilities must be available.
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===Infiltration===
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For information about constraints to infiltration practices, and approaches and tools for identifying and designing within them see [[Infiltration]].
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For guidance on infiltration testing and selecting a design infiltration rate see [[Design infiltration rate]].
===Site Topography===
===Site Topography===