thank you very much, your answers are very clear and useful.
Actually, the design of the retaining walls mention only weep holes, and while the retaining walls are part of the building block and surrounding four underground floors "used as parking", so I suggested to change the solution to be...
I have some questions and I hope to get some answer
1- What is the best type of geotextile that can be used in pipe drainage system " woven or non-woven , thickness, density... "
2- Does geotextile " by time and because of fines carried in water" being failed to pass water through to pipes, do...
