When bottom rolling sliding door hardware is used, the bottom track is set 3/16" above finish floor. Each track is coupled with a drain slot along the length of the track. Drain tubes are plumbed into the bottom to move away excess water.
Similar to the top hung tracks, the combination of multiple door tracks creates a multiple drain opportunity. At each of the interlock stiles of a multiple door set, an additional interlock drain is added to further draw off water.
Extreme weather exposures should be evaluated for water drainage. Additional drains can be added on standard tracks, as well as additional drainage slots on the inside of the entire track system. Coordination with waterproofing consultants is recommended in all unprotected exposures. see drawings