| − | To minimize the total depth of the practice, d<sub>T</sub>, and save aggregate, consider installing void-producing structures, embedded in clear stone aggregate, in the storage reservoir instead of just aggregate, which will provide a greater effective porosity (n').  | + | To minimize the total depth of the practice, d<sub>T</sub>, and save aggregate, consider installing void-producing structures (e.g. Permavoid, D-Raintank, low profile stormwater chamber, etc.), embedded in clear stone aggregate, in the storage reservoir instead of just aggregate, which will provide a greater effective porosity (n').  | 
|   | ==Calculate the total depth of the practice, d<sub>T</sub>==  |   | ==Calculate the total depth of the practice, d<sub>T</sub>==  |