Difference between revisions of "User talk:Jenny Hill"
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! Component | ! Component | ||
| − | ! Void ratio | + | ! Typical Void ratio |
! Recommended depth (with underdrain pipe) | ! Recommended depth (with underdrain pipe) | ||
! Recommended depth (no underdrain pipe) | ! Recommended depth (no underdrain pipe) | ||
| Line 20: | Line 20: | ||
|- | |- | ||
| [[Biofiler media]] | | [[Biofiler media]] | ||
| − | | 0.3 | + | | 0.3 |
| colspan="2" | | | colspan="2" | | ||
* 300 mm to support turf grass and accept only roof runoff | * 300 mm to support turf grass and accept only roof runoff | ||
Revision as of 20:59, 16 February 2018
Many of the dimensions in a bioretention system are relatively constrained by the performance requirements of the individual component. There is greatest flexibility in the ponding depth and the depth of the storage reservoir beneath the optional underdrain pipe. The order of operations in calculating these dimensions depends on whether an underdrain is desired.
| Component | Typical Void ratio | Recommended depth (with underdrain pipe) | Recommended depth (no underdrain pipe) |
|---|---|---|---|
| Ponding depth | 1 | 300 mm | See below |
| Mulch |
|
75 ± 25 mm | |
| Biofiler media | 0.3 |
| |
| Choker course | 0.4 typical | 100 mm | |
| Embedding reservoir | 0.4 | Is equal to underdrain pipe diameter | Not applicable |
| Storage reservoir | 0.4 | See below | See below |
Determine maximum overall depth[edit]
- Determine what the planting needs are and assign appropriate depth of media.
- Determine what the pipe diameter needs to be and assign appropriate depth of reservoir.
- Determine maximum possible storage reservoir depth (dS):
Where:
- f' = Design infiltration rate in mm/hr, and
- 38.4 comes from multiplying desired drainage time of 96 hours by void ratio of 0.4
Additional step for system without underdrain[edit]
- Determine maximum permissible ponding depth (dP):
Where:
- f' = Design infiltration rate in mm/hr, and
- 19.2 comes from multiplying desired drainage time of 48 hours by void ratio of 0.4. Note that conceptually the drainage of the ponded area is limited by ex-filtration at the base of the practice.
This file will be downloaded when clicked
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Wishlist[edit]
- Extension:Scribunto
- To enable the use of:
- Module:Clade
- Module:Weather box
- Mobile FrontEnd
Stuff I've done[edit]
- Restrict account creation
- pdf Handler
- Multimedia viewer
- YouTube
- Google analytics
Test stuff[edit]
Textey text
Captiony caption
Wordsy words
| Formal Infobox | |
| Common name: | Wordiness virus |
| Medical name: | (see notebox below) |
| Habitat: | here, 19-Dec-2008 |
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