Horizontal Drain CAD Drawing

Subsurface drainage system such as horizontal drain is aims at improving slope stability by controlling the pore water pressure within the slope. Most drains are made of 7.5cm to 10cm diameter PVC perforated pipes., wrapped in filter fabric, which are introduced in predrilled holes at gradients of about 10% uphill.

As a general rule, long drains with larger spacing are more effcient than short drains with less spacing. Moreover, the smaller the slope angle, the longer the drain should be.

PVC pipes should not exceed 40m in length; for longer drains stiffer pipe materials (stainless or galvanized) are recommended. 

This drawing will be useful for students, contractors, engineers and developers.