<p>SPVD: Prefabricated Vertical Synthetic Drains shall consist of a continuous plastic drainage core wrapped in a non-woven polypropylene/polyester geotexile material having discharge capacity at 240 kPa and Hydraulic Gradient of 1 should be greater than 500 m3/yr and shall meet the following specifications.<br>Composite Drain Properties:<br>Weight (q/m)&gt;75 ± 10%, Width (mm) ≥ 100 ± 2, Thickness (mm) &gt; 3.0, Tensile Strength (kN)&gt;2.2 , Elongation at 2.0 kN (%) &gt;25 , Strength at 10% Elongation (kN)&gt;1.3<br>Filter Fabric Properties:<br>CBR Puncture Resistance (N)&gt;150 , Trapezoidal Tear Strength (N) &gt;200 Grab Tensile Strength (N) &gt; 550, Apparent opening size(AOS, 095) (micron) ≤ 90, Permeability/ Permittivity (cm/s) &gt; 200 × 100</p>