The three-layer system
Water leaves a turf lawn vertically: through the backing (the published rate of 50 to over 1,000 in/hr across our catalog; even the low end is many times any real storm), into the base (compacted permeable rock that conducts water sideways toward exits), following the grade (the 1–2% slope built at excavation that decides where "away" is). The turf’s number gets the marketing attention, but the base and grade do most of the work. A 1,000+ in/hr backing over sealed clay is a bathtub with a fast drain plug and nowhere to empty.
The pet-science version
For dog owners, drainage is odor control by another name: urine that transits the system in seconds can’t bond and smell, which is why the pet spec chain is fast backing (FlowThru’s 1,000+ in/hr exists for this) + clean base + ammonia-control infill in the potty zone. Get the chain right and a hose pass is the whole protocol; skip a link and you’re fighting chemistry with deodorizer.
The three wet failures
- Built flat: no grade means water obeys puddle physics. Fixed only at excavation; get it right once.
- Base of fines or dirt: compacted soil or sand-heavy base seals like pastry. Quarter-inch-minus rock exists for a reason.
- Edges damming: turf dying into a raised border with no relief path holds a moat. Plan the exit like a roofer plans a valley.