Why it matters
The slowest or blocked part of the system can control performance. Turf, seams, infill, base, subgrade, slope, drains, and the outlet all need to work together.
How it is used
Manufacturers publish product drainage figures, while installers evaluate existing grades, soil, runoff, low points, and the destination of water after it enters the base.
The money question
How can it affect project cost?
The number itself does not determine price. Correcting standing water, regrading, stabilizing soil, installing drains, or building a more deliberate base can add site-specific cost.
Common mistakes
- Comparing figures with different units or test conditions
- Believing a high carpet rate fixes a bad subgrade
- Ignoring runoff from roofs, slopes, or neighboring areas
Questions to ask an installer or supplier
- What part of the system was tested for this drainage claim?
- Where will site water go after entering the base?
- Does the proposal include correction of existing drainage problems?
Useful comparisons
Sources and review
- Synthetic Turf Council: Guidelines for Essential Elements of Synthetic Turf Systems
- Synthetic Turf Council: Considerations When Buying Synthetic Grass
- Synthetic Turf Council: Glossary of Synthetic Turf Terms
Editorially reviewed July 18, 2026. General educational guidance; verify product claims and site conditions for your project.