perforated although if segment 10 is extruded as a single piece it would be difficult to perforate according to the present invention drain face 14 includes a plurality of drain perforations foramens 24 preferably bottom surface 18 also includes a plurality of drain perforations foramens 25 drain perforations 24 and 25 are sized to permit excess water to enter the interior channel 20 as soon as it rises to the level of bottom surface 18 but prevents gravel or other larger granular sized solid material from entering the internal channel 20 a filter cloth not shown could also be used top prevent the infiltration of debris form drain segment 10 can be constructed in a variety of heights widths and lengths to accommodate different foundation construction requirements in addition to linear portions of form drain segment 10 form drain segment 10 can be constructed or interconnected in an angular shape e g 90 degree interior angle or 45 degree exterior angle or a curved shape e g 12 inch radius exterior curve to accommodate the construction requirements for a variety of foundation shapes each form drain segment 10 can be connected to another form drain segment 10 according to one embodiment shown in fig2 individual form drain segments 10 are connected to each other using a female female.