Difference between revisions of "Flow through perforated pipe"

From LID SWM Planning and Design Guide
Jump to navigation Jump to search
m
m
Line 1: Line 1:
Manufacturers of perforated pipe are often able to provide the open area (m<sup>2</sup>) per meter length.  
Manufacturers of perforated pipe are often able to provide the open area (m<sup>2</sup>) per meter length.  


<math>Q_{max, p}=B\times C_{d}\times A_{o}\sqrt{2\cdot g\cdot \sum d+}</math>
<math>Q_{max, p}=B\times C_{d}\times A_{o}\sqrt{2\cdot g\cdot \sum d}</math>
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*''K<sub>m</sub>'' is the hydraulic conductivity of the filter media (mm/hr),  
*''K<sub>m</sub>'' is the hydraulic conductivity of the filter media (mm/hr),  
Line 7: Line 7:
*''d<sub>p</sub>'' is the depth of ponding (mm),  
*''d<sub>p</sub>'' is the depth of ponding (mm),  
*''d<sub>m</sub>'' is the depth of the filter media (mm), and  
*''d<sub>m</sub>'' is the depth of the filter media (mm), and  
*''Σ d+'' is the total depth of bioretention components over the perforated pipe (mm) (e.g. ponding/[[mulch]]/[[filter media]]/[[choker layer]]),  
*''Σ d'' is the total depth of bioretention components over the perforated pipe (mm) (e.g. ponding/[[mulch]]/[[filter media]]/[[choker layer]]),  
}}
}}

Revision as of 02:15, 25 February 2018

Manufacturers of perforated pipe are often able to provide the open area (m2) per meter length.

Where:

  • Km is the hydraulic conductivity of the filter media (mm/hr),
  • Ap is the area of the practice (m2),
  • dp is the depth of ponding (mm),
  • dm is the depth of the filter media (mm), and
  • Σ d is the total depth of bioretention components over the perforated pipe (mm) (e.g. ponding/mulch/filter media/choker layer),