Filtration basin modeling
Filtration basin modeling
(OP)
I am trying to model a filtration basin where I have 24" of planting medium (50% sand, 25% topsoil, 25% compost) and a 4" draintile at the bottom. I am wondering if anybody has an estimate on the void ratio of the aforementioned planting medium? How does 30% sound?
Also, has anybody had any problems with routing exfiltration to another pond, i.e. through the 4" draintile. Sometimes my volume out is greater than my volume in...
Also, has anybody had any problems with routing exfiltration to another pond, i.e. through the 4" draintile. Sometimes my volume out is greater than my volume in...





RE: Filtration basin modeling
RE: Filtration basin modeling
Read thread:
http://www.eng-tips.com/viewthread.cfm?qid=209756
We had a detailed discussion on the routing issues you mention.
RE: Filtration basin modeling
Please click the warning message for details and recommendations. Until you fix the warning, do not proceed or draw any conclusions from the model.
BTW, 40% voids is generally the best you can get from clean stone, so I suspect the value is much too high for bioretention media.
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Filtration basin modeling
Modeling beehive orifice using a horizontal oriface using the square foot opening of the casting to determine the opening diameter.
Model the 12-inch pipe as a reach. route the oriface and the delay link to the the reach. Hope this helps.
P>S. As mentioned by psmart, try to fix the in/out error. You could try to decrease the dt or increase the size of the live storage.
RE: Filtration basin modeling
BTW, the article mentioned in the OP is at www.hydrocad.net/raingarden.htm
Peter Smart
HydroCAD Software
www.hydrocad.net