Planters: Sizing
Revision as of 21:48, 20 May 2022 by Dean Young (talk | contribs)
This article is specific to flow-through stormwater planters, vegetated systems that do not infiltrate water to the native soil.
If you are designing a planted system which does infiltrate water, see advice on Bioretention: Sizing.
The dimensions of a stormwater planter are largely predetermined according to the function of the component. As they do not contain a storage reservoir the planters rely more upon careful selection of materials. Both the satruated hydraulic conductivity of the filter media and the number and size of perforations of the underdrain pipe play critical roles for flow control.
Component | Recommended depth (with underdrain pipe) | Typical porosity (n) |
---|---|---|
Ponding (dp) | 150 to 450 mm | 1 |
Mulch | 75 ± 25 mm |
|
Filter media (dm) |
|
|
Pipe diameter reservoir | Is equal to underdrain pipe diameter | 0.4 |
Pipe bedding (db) | 50 mm (although commonly omitted altogether). | 0.4 |