Porosity is the ratio of  reinforcement weight to weight of solid block of same dimensions as the reinforcement. Permeability has to be measured experimentally for each layup. Use darcy's law for the permeability

Thanks dear sir Pramod Vadavkar. For the permeability it's ok but for the porosity I do not understand properly your explaination it's like some parts of your sentence are not here.

Take weight (w1)of approx 200 mm (length)x 200 mm (breadth) x t mm (thickness) of reinforcement ( the thickness must be as per your designed layup). Calculate the weight (w2)of 200 mm x 200 mm x t mm solid block of the reinforcement.. Take ratio of  

w1/w2. 

Thanks sir Pramod Vadavkar.