Trackside sand drain

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1. A Pipe drain installed along the inner circumference of a running track to drain both the track surface and the enclosed field area; perforated pipe is laid in a trench and covered with gravel, then the trench is filled to the surface with 4" to 6" of coarse sand.

track.drain01.JPG
The drain is added to keep water off the track.
Source:http://www.onekama.k12.mi.us/h2003/new.track/