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==Sub-surface components==
==Sub-surface components==
Most LID practices use a combination of sub-surface features such as gravel storage reservoirs, liners, underdrains, monitoring wells, and other components to meet their design objectives. The construction process for sub-surface components works from the ground up. While some LID practices include all the sub-surface components listed below, most designs will not include one or more of these layers or components. [[Permeable pavements]] can have different construction requirements at this stage, mostly regarding compaction of sub-surface layers. Installing [[infiltration chambers]] also requires guidance specific to that LID type.  
Most LID practices use a combination of sub-surface features such as gravel storage reservoirs, liners, underdrains, monitoring wells, and other components to meet their design objectives. The construction process for sub-surface components works from the ground up. While some LID practices include all the sub-surface components listed below, most designs will not include one or more of these layers or components. [[Permeable pavements]] can have different construction requirements at this stage, mostly regarding compaction of sub-surface layers. Installing [[infiltration chambers]] also requires guidance specific to that LID type. [[Stormwater Tree Trenches]], which  consist of subsurface trenches filled with modular structures and growing medium, or structurally engineered soil medium to supporting an overlying pavements, also require advice specific to them.  


The [[sub-surface components]] page gives guidance on:  
The [[sub-surface components]] page gives guidance on:  
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