Field testing of artificial grass and natural grass

1. Slope: The required slope for artificial turf is less than 1.0%; The natural lawn slope requirement is less than 0.5%.
2. Flatness: The flatness of artificial turf is less than 10 millimeters within 3 meters and less than 2 millimeters within 300 millimeters; The natural lawn flatness has a qualified value of no more than 30mm, and the optimal value is no more than 20mm.
3. Permeability rate: The permeability of artificial turf foundation is greater than 180 millimeters per hour; The permeability of natural turf foundation is greater than 180 millimeters per hour.