Factors affecting the drainage mechanism of geotextiles

Ceotextile Open jointed or perforated pipe of diameter (d) 

Thus for separation, filtration, and drainage applications the cross-plane and in-plane permeability values obtained by index testing would be moderated according to  

The individual reduction factors being RFscb = for possible particle clogging and blinding 

RFcr = for reduced pore size caused by mechanical creep of material RFjn = for reduced pore space due to adjacent materials intruding into the geotextile 

RFcc = for chemical clogging of pore spaces RFrd = for biological clogging of pore spaces 

---